CN1759635A

CN1759635A - Apparatus and method for reproducing sound

Info

Publication number: CN1759635A
Application number: CNA038261847A
Authority: CN
Inventors: 谢利·卡茨
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-01-22
Filing date: 2003-01-22
Publication date: 2006-04-12
Also published as: WO2004066672A1; HK1062873A1; JP2006513656A; GB2387500A; CA2553744A1; AU2003202084A1; GB0318324D0; KR20100063142A; GB2387500B; KR20050111321A; EP1588584A1; KR101052938B1

Abstract

A sound reproduction method and apparatus utilizes distributed mode loudspeakers and pistonic loudspeakers driven simultaneously over at least partially overlapping frequency ranges for enhancing the resulting sense of spatial spaciousness. The disclosure includes monophonic, stereo and multi-channel sound reproduction systems and electronic musical instruments, such as digital pianos.

Description

Be used to reproduce the apparatus and method of sound

Technical field

The present invention and comprises a kind of speaker combination of novelty and the electronic circuit that drives a kind of novelty of this combination with a kind of to be used to reproduce sound method relevant with device.The present invention is specially adapted to reproduce the sound recorded or broadcast sounds and from electronic musical instrument, particularly the sound of Digital piano.

Background technology

For many years, the method for electricity consumption produce and reproduce sound be always research and development theme.The performance of loud speaker is paid close attention in aspect of research, and its purpose is to improve the fidelity and the quality of the sound that their produce, and for example, produce a kind of such loud speaker, and its moving meter will verily be followed the variation of the signal of telecommunication that drives them.Another aspect of research and development is paid close attention to the signal of telecommunication of representative voice is encoded, writes down, broadcasted and the technology of work such as decoding, and its purpose is to improve the authenticity of the sound of the loudspeaker reproduction that is driven by decoded signal.

Fidelity and loudspeaker design

As seeking the improved result of loudspeaker techniques, more currently appearred with the loud speaker of the different model of different principle operation separately.

For example, traditional cone loudspeaker, the awl basin of wherein making with relatively hard materials and be engaged installation is by a moving coil or moving magnet carries out Electromagnetic Drive.Such loud speaker may be in fact the most popular, and obtained using widely in a large amount of different application, and they each have the unique design requirement of himself.Examples of applications is embodied in the home entertainment system, and be used to reproducing music, voice and audio-video material, and wired broadcast system, the voice output of computer, the sound system of movie theatre and theater, vehicle entertainment system is among wired broadcast system and electric or electronic musical instrument such as the digital piano.

Up to the present still fail to design a kind of can be in whole audio range, particularly from the 50Hz or the cone loudspeaker of low frequency sound of the better fidelity of generation to the frequency range of about 20KHz more.Thereby high-quality sound, for example, can only obtain by being used in combination two or more cone loudspeaker unit that design at a special frequency channel separately for the music reproducing system of faithful to primary sound.Thereby the drive signal of these unit is by the circuit of frequency dividing circuit by name, and delivers to suitable cone loudspeaker by the drive signal that the latter will be in different frequency bands.At least three kinds of loud speakers of many common employings of high quality speaker system, a kind of high frequency that is used for, this is a high pitch loudspeaker, a kind of intermediate frequency range that is used for, the third then is used for low frequency, and they are called as woofer and time woofer respectively.The sound that have relatively than hi-fi is reproduced with a quite straight frequency response curve in most of zone of the frequency range that modern cone loudspeaker system can hear at people's ear, and up to the present is a kind of loud speaker that obtains extensive use in the occasion of reproducing music.

Another kind of loud speaker in usefulness is an electrostatic loudspeaker, therein, and the alternation electrostatic field initiation vibration that the plastic film that is slightly stretched is made by the signal of pair of electrodes generation, and film is placed on this between the electrode.Because film is light especially, thereby it has lower mechanical inertia, so the motion of film even can reproduce the high-frequency signal that be applied on it with higher relatively fidelity.A characteristic of electrostatic loudspeaker is, compares with the loud speaker of other types, and the sound that their produce has the clarity of height.Yet, the sound of the low-limit frequency that the current electrostatic loudspeaker that can buy occurs in can not reproducing music.In addition, and the sound sound pressure level that produces except electrostatic loudspeaker is lower than the fact of the sound sound pressure level that cone loudspeaker produces, and many people think that the frequency range that electrostatic loudspeaker can be worked at them provides the sound with extra high fidelity really.

Above-mentioned cone loudspeaker and electrostatic loudspeaker produce sound by the piston type motion of awl basin or film.

In recent years, the third loud speaker that does not rely on piston type motion is come into operation.This is a distributed mode speaker.Many publications are introduced it, for example:

(a) the PCT application number is the document of WO 97/09842;

(b) Application No. is 6399870 document;

(c) article of " NXT faces adverse conditions (NXT Up Against Wall) " by name of writing by Henry Azima on one piece of " sound " magazine that appears in September, 1998 of publishing number by Hachette Filipacchi Magazines Co., Ltd;

(d) article of a piece " as distributed mode speaker (DML) (Thedistributed Mode Loudsspeaker (DML) as a Broad-Band AcousticRadiator) of a kind of broadband acoustic radiator " by name reading out in the 103rd the audio engineering association conference of writing and be to hold in New York 26 to 29 September in 1997 by Neil Harris and Malcolm Omar Hawksford;

(e) article of a piece " the borderline phase mutual effect of distributed radiator scattered field (the Boundary Interaction of DiffuseField Distributed Mode Radiators) " by name that reads out in the 103rd the audio engineering association conference of writing and be to hold in New York 26 to 29 September in 1997 by Henry Azima and Neil Harris;

(f) article of a piece " distributed mode speaker simulation model (the distributed Mode Loudspeaker SimulationModel) " by name that reads out in the 104th the audio engineering association conference of writing and be to hold in Amsterdam 16 to 19 May in 1998 by Joerg W.Panzer and Neil Harris;

(g) article of a piece " distributed mode speaker radiation emulation (the distributed Mode Loudspeaker RadiationSimulation) " by name that reads out in the 105th the audio engineering association conference of writing and be to hold in San Francisco, California 26 to 29 September in 1998 by Joerg Panzer and Neil Harris;

These publications are enumerated in this, for your guidance.Many publications have also been done introduction to the structure and the work characteristics of this distributed mode speaker, and the some of them publication is mentioned in above-mentioned article and paper to some extent.

As described in above-mentioned publication, a distributed mode speaker comprises a panel and the one or more transducers that append on this panel, when it is triggered by a kind of electroacoustic signal, just can produce the bending wave of resonance in panel, these ripples are distributed in the surface of panel or the desired part of panel surface with a kind of form of complexity.By transducer panel is energized into these distributed resonance modes, requires the manufacture of panel to make it can be excited to these distributed resonance modes and arrange meticulously that according to the characteristic of panel transducer or transducer group are so that can produce desired resonance mode in the panel.The expert in distributed mode speaker field can use many not same material and multi-form transducer to design the distributed mode speaker of different size.

The successful design distributed mode speaker is a kind of process of complexity, because depending on, the mode of vibration of panel and frequency response thereof comprise panel width, highly, and thickness, material, density of material, Poisson's ratio, bending rigidity, attenuation coefficient, shear ratio, modulus of shearing, the numbers of transducers of transducer character and position and employing is at interior a large amount of different parameters.In practice, be necessary to calculate frequency response according to mathematical equation, can be about this respect referring to above-mentioned and distributed relevant publication.Can be that the NewTransducers Co., Ltd in Signet building on kingfisher road of the Hinchingbrook business park that is positioned at the Huntingdon of PE29 6FW has bought and is used to carry out these and calculates from postcode, thereby make things convenient for a kind of computer program that successfully designs distributed mode speaker.The different relevant parameters of the loud speaker that this computer program permission designer's input or selection will design, then, this program calculates the frequency response and the vibration characteristics of the loud speaker that will design, to allow the designer can make correct design decision.

Except above-mentioned computer program, distributed mode speaker can have been bought in some different locations, as the postcode that is positioned at Cirrus building, Glebe road, Huntingdon, Cambridge shire, England is the Amina Technologies Co., Ltd of PE297DX; Be positioned at the Tannoy Co., Ltd that Scotland Coatbridge postcode is ML5 4TF; The postcode that is positioned at Cambridge shire, England Huntingdon Stonehill is Mission (UK) Co., Ltd of PE296EY; Or the postcode that is positioned at No. 500, U.S. Lancaster Colombia main road is the ArmstrongWorld Industries company of PA 17603.

Distributed mode speaker and other forms of loud speaker are being carried out the existing multiple different suggestion of combined aspects.For example, because current getable distributed mode speaker can accurately not reproduce the sound of the frequency that is lower than 100Hz, someone advises they are used in combination with separated woofer of distributed mode speaker with a kind of, and these two kinds of loud speakers drive by suitable filtration (frequency division) circuit.Similarly, speaker combination also can have been bought with burst mode, this kind combination in a shared casing comprises the distributed mode speaker that is used as high pitch loudspeaker, the one or more traditional cone loudspeaker that is used as the loud speaker of woofer and/or middle pitch scope, and traditional frequency dividing circuit, ad hoc drive so that distributed mode speaker is in the signal of the frequency band range of suitable high pitch loudspeaker, the signal that cone loudspeaker or cone loudspeaker group are in the frequency band range of suitable woofer and middle pitch scope loud speaker ad hoc drives.

In being the document of 6351542 (people such as Azima), U.S. Patent number introduced another suggestion about a kind of whole frequency range speaker system of having utilized distributed mode speaker.In this patent, a distributed mode speaker has constituted a face wall of closed cells.This cell is linked a casing that comprises woofer (woofer) by a pipeline, makes that comprising the air pressure change that produces in the casing of woofer is transferred into closed cells by pipeline.Distributed mode speaker supports with submitting to property material in its edge, and make it can respond the air pressure change in the closed cells and carry out piston type and move, thereby, vibrate by in fact the piston type consistent with woofer take place, produced low-frequency sound.

The PCT application number of having mentioned above is to have disclosed may use and dispose in a large number for distributed mode speaker in the document of WO 97/09842.The shaped form panel is adopted in a kind of configuration suggestion that discloses in this PCT application documents in distributed mode speaker, its purpose is sound is concentrated on a specific direction.Another kind of configuration (shown in Figure 65 in this PCT application) suggestion will include at least one face wall of conventional loudspeakers case as passive panel, this panel can carry out resonant vibration, but, it is not to cause vibration by electromagnetic transducer, but when comprising woofer, the resonance that causes by the air pressure change that occurs in the loudspeaker box when traditional cone loudspeaker of the loud speaker of middle pitch scope and high pitch loudspeaker is driven and cause vibration.It is said that this configuration can realize that the sound of wanting dyes.

A considerable advantage of distributed mode speaker is that they can be made into quite smooth shape, and this makes them can be used to use the inconvenient or occasion that visually seems rude of cone loudspeaker.Yet, distributed mode speaker still is not used widely in hi-fi music reproduction field, this may be because, although the major part that they can be constructed for the frequency range that can hear at people's ear produces sound, their frequency response is straight not as the frequency response of well-designed cone loudspeaker.

Authenticity and sound coding techniques

Caused succeeding in developing of stereophonic sound system for the research that improves the authenticity of reproducing back sound, in this system, the recording or the broadcasting that comprise unlike signal are admitted in the separate passage, be placed on the loud speaker in listener the place ahead with driving, make its left and right-hand sounding towards the listener.These systems began to be used widely in 20th century 50 and the sixties, and were still continued to use now.They stay a kind of impression to the listener, and promptly the diverse location of sound in its place ahead produced and move and passed sound " stage ".They give the listener a kind of impression too, be their reproduce have the broad sense in space by symphony orchestra or as the sound that the musical instrument of piano and so on sends, and kept complete sound composition, and this is more superior compared with using the individual signals passage to reproduce sound.

In order further to improve the broad sense in space in listener's impression, and some possible special-effects are provided, as allow the listener feel that sound source takes place significantly to move the four-way system in the residing three dimensions of listener, also be four-channel sound, be developed the sixties in 20th century.Although made some recording and broadcasting for it at that time, four-channel sound is not used widely.One of problem of this system is, they need special recording and broadcast technology, and wherein, different signals is encoded in different passages, in fact four loud speakers are placed on four jiaos of room, and the listener is in four central zone of space between the loud speaker.Although these systems are not used widely at that time, with respect to stereophonic sound system, still make moderate progress aspect its broad sense in the space in listener's impression and " encirclement ", listen to the impression of music than it in the much bigger room of actual room-sized of living at one as stay him to the listener, and make the listener produce the sensation of being surrounded by sound.Integrate, these impression give a kind of psychologic acoustics of listener and experience, and this experience more approaches him and has the experience of the sound that can provide suitable when listening to music in by the music hall of the acoustics facility of wall reflective level and suitable order of reflection at one.

In recent years, so-called " surround sound " system is come into operation, particularly in movie theatre and so-called " home theater " entertainment systems.One of main purpose of surround sound is to produce special acoustic efficiency, the sound that sends when comprising ambiophonic system and listener's space as simulating vehicle.Ambiophonic system generally comprises five passages, is respectively applied for the loud speaker that drives listener left forward side and right side, the loud speaker and a loud speaker that is in the place ahead middle position on listener left side and right side.The signal that this system requirements will reproduce is independently encoded in five passages separately, so that each loud speaker independent of each other can be driven as recording and broadcast singal through coding by its special signal.By the appropriate signal coding, to compare with stereophonic sound system, ambiophonic system is making moderate progress aspect broad sense in space and the encirclement property.

Summary of the invention

As mentioned above, although in the past few decades, people have obtained significant progress in loudspeaker design and signal encoding field, still be necessary to develop a cover can produce the sound that tonequality is improved with rational cost from the signal of telecommunication system, particularly will develop one and overlap the system that the broad sense in space that produced increases.

On the one hand, current invention is by driving at least one piston type loud speaker and at least one distributed mode speaker simultaneously, obtaining improvement aspect broad sense in space and/or the encirclement property, and wherein at least a portion zone of the frequency range that can hear at people's ear of the frequency range of each speaker operation has taken place overlapping.Preferably, the lap of said frequencies scope comprises relatively low frequency part.

The discovery that we are surprised comes legal system sound in this way by making, and can obtain the broad sense in space of enhancing and/or encirclement property, even also be like this in single channel (monophony) system.Therefore, the present invention can be used to single channel, stereo and multiple channel acousto sound reproduction system.

Below, will be by quoting the comparative test carried out already and the improvement that obtains aspect the broad sense in space and encirclement property and the simple and honest property of sound further being discussed by these result of the tests that Fig. 1 to Fig. 7 in the accompanying drawing represents.And, will Fig. 8 to Figure 31 introduces embodiments of the invention in the accompanying drawing by quoting.

Description of drawings

In the accompanying drawing:

Fig. 1 shows the block diagram of the laterally early stage energy mark (LEF) that records in the test in the first time of using a stereophonics system, wherein traditional cone loudspeaker to independent use, use distributed mode speaker separately, and use the laterally early stage energy mark of obtaining under the various situations such as speaker combination that comprise the above two of design to compare according to the present invention.

Fig. 2 is a block diagram that shows the binaural cross-correlation coefficient (IACC) that records in the test of mentioning in the discussion relevant with Fig. 1.

Fig. 3 and Fig. 4 be and Fig. 1 and the similar block diagram of Fig. 2, but shown in them be LEF and the IACC that records in second test of using a monophony system.

Fig. 5 and Fig. 6 show a traditional cone loudspeaker of use in the test for the third time of the present invention and the frequency response of a distributed mode speaker respectively.

Fig. 7 shows the frequency response that obtains when the loud speaker relevant with Fig. 5 and Fig. 6 driven simultaneously, and the result that obtains when being changed of the different curves of each bar of Fig. 7 relative sound pressure level of showing two loud speakers.

Fig. 8 is the block diagram of a kind of stereophonics device of making according to the first embodiment of the present invention.

Fig. 9 is included in the perspective illustration of a kind of speaker combination in the device of Fig. 8.

Figure 10 illustrates the part of the distributed mode speaker in the speaker combination that is included in Fig. 9 with schematic cross-sectional, and shows an electromagnetic driver that is affixed on the Speaker panel.

Figure 11 is the perspective view of the signal in a cross section in the distributed mode speaker in the speaker combination among Fig. 9, shows the Speaker panel of carrying out and install in a supporting frame.

Figure 12 is the side cross-sectional view of the signal of speaker combination among Fig. 9, shows a schematic block circuit diagram that is used for speaker combination.

Figure 13 is the block diagram of a kind of stereophonics device of making according to a second embodiment of the present invention.

Figure 14 is a kind of electrical diagram that is included in the circuit for signal conditioning in this device equally that is used for driving the distributed mode speaker of the device that is included in Figure 13.

Figure 15 shows the electrical diagram that circuit made an amendment among Figure 14, constitutes a partial electrical block diagram of third embodiment of the invention.

Figure 16 is the block diagram of a fourth embodiment in accordance with the invention a kind of stereophonics device of making.

Figure 17 is the block diagram of a kind of stereophonics device of making according to a fifth embodiment of the invention.

Figure 18 is the block diagram of a kind of stereophonics device of making according to a sixth embodiment of the invention.

Figure 19 is the electrical diagram that is included in a kind of stereo amplifier in Figure 18 device.

Figure 20 is the block diagram of a kind of stereophonics device of making according to a seventh embodiment of the invention.

Figure 21 is the block diagram of a kind of stereophonics device of making according to the eighth embodiment of the present invention.

Figure 22 is the perspective view of the signal of a kind of stereophonics device of making according to the ninth embodiment of the present invention.

Figure 23 is the partial circuit diagram of installing shown in Figure 22.

Figure 24 is the block diagram of a kind of stereophonics device of making according to the tenth embodiment of the present invention.

Figure 25 is the block diagram of a kind of " surround sound " transcriber of making according to the 11st embodiment of the present invention.

Figure 26 is the perspective view according to a kind of digital grand piano of one embodiment of the invention design.

Figure 27 is the schematic block diagram of the Digital piano among Figure 26.

Figure 28 is a back perspective view according to a kind of vertical Digital piano of one embodiment of the invention design.

Figure 29 is the block diagram of Digital piano among Figure 28.

Figure 30 is the block diagram to another embodiment of Digital piano of design according to the present invention; And

Figure 31 is according to another embodiment of the present invention and the block diagram of a kind of attachment device of doing, and as shown in the figure, this attachment device is connected on a kind of traditional Digital piano, makes this attachment device and the present invention of Digital piano common implementing.

Embodiment

Test

General introduction to test

For to using the accident increase of the obtained broad sense in space in people's impression to study distributed mode speaker and the merging of piston type loud speaker, in some varying environments, use different loud speaker and other devices to do different tests according to the present invention.

The cone loudspeaker system that is used as the studio listen device of top quality and the distributed mode speaker of top quality in all tests, have all been used.Each test has all been carried out subjectivity on one's body expert's level audience and has been listened to test, and different listeners is placed oneself in the midst of among the different tests.

We have used and have been placed on a specialty and listen to an indoor cover stereophonic sound system in a test (below will describe in detail first test), listen to condition with the typical acoustics that simulation can run in keeping room usually.This chamber of listening to substantially and a houseplace measure-alike, and around its wall random distribution reflection and non-reflexive surface, on its floor, be covered with carpet, and disposed some and sound is had the furniture and the object of high-absorbable.Sound is suitable " oppressiveness ", because comprised soft stuff and curtain in the living room.

Second test is about half the different specialties of using in first test above-mentioned of chamber size of listening to a size listens to and uses the monophony device in the chamber and carry out, and its wall absorbs the frequency that surpasses 10000Hz.Similar with first test, sound seem quite " oppressiveness ".In this test, used the monophony device.

Also used the monophony device in the 3rd test.Loud speaker is placed among the disadvantageous especially acoustic enviroment, and promptly they are in two infalls that are about 2 meters wide corridors separately, and the bearing of trend in these two corridors is perpendicular to one another.Listen to test in the experimenter being placed in a corridor about 3 meters, and loud speaker carries out under the condition of the inside, the corridor placement at experimenter place apart from loud speaker.In all tests, subjective hearing test has disclosed, and compares with individual drive cone loudspeaker or individual drive distributed mode speaker, and when driving distributed mode speaker and cone loudspeaker simultaneously, people can feel that the broad sense in space increases.Whether in order to determine that the broad sense in this sensorial space improves only is a kind of subjective impression of people, still also have simultaneously scientific basis, in first test and second test, we measure laterally early stage energy mark (LEF) and binaural cross-correlation coefficient (IACC) according to traditional method of measurement.Below, will do more comprehensively to explain to the implication of LEF and IACC parameter.

In listening to test, considered the in test subjective quality of the sound of the different device generation of use.In first test (stereo), the sound pressure level of distributed mode speaker and cone loudspeaker is configured to much at one value measuring with the microphone place, and think on the subjective feeling, independent from the sound quality ratio of speaker combination by the sound quality of cone loudspeaker generation or better by the sound quality of distributed mode speaker generation separately.

In second test, the sound pressure level of distributed mode speaker is configured to the sound pressure level low 4.2 decibels (place records at microphone) than cone loudspeaker.These data are chosen after having tested a series of different relative sound pressure level.Here, the sound quality that is produced by speaker combination is considered to than independent equally by the sound quality of cone loudspeaker generation or better by the sound quality of distributed mode speaker generation separately.

In the 3rd test, we test for the influence of the subjective quality of sound the relative sound pressure level that changes distributed mode speaker and cone loudspeaker, and find, drive distributed mode speaker with sound pressure level the best sound quality of feeling can be provided, and we find that the sound quality of feeling when this sound quality ratio is listened to distributed mode speaker separately or listened to cone loudspeaker separately is better than low 5 ± 3 decibels of the sound pressure level that drives cone loudspeaker.

The 3rd test has also comprised the frequency response when determining to use separately above-mentioned two kinds of loud speakers and has used the measurement of the fashionable frequency response of set of speakers.The frequency response of speaker combination is to be determined on a series of different relative levels that its loud speaker is activated.We find from these tests with calculating, and the frequency response curve that obtains when getable frequency response curve ratio uses distributed mode speaker separately from speaker combination is more level and smooth.

Now, with more detailed this three tests of introducing.

First experimental details (stereo)

First test uses following apparatus to carry out under the following conditions:

(a) the test room is between a typical drying shed, and has placed some extra acoustic absorption panels at random in its side and back wall.The size in this room is meter wide * 2.79,6.87 meters long * 4.6 meter high=88.17 cubic metre volumes.

(b) loud speaker and microphone are placed on the summit of an equilateral triangle.Distance between loud speaker and the microphone is 2 meters (the triangle length of side is 2 meters), and loud speaker is placed on the position of room wall certain intervals.

(c) speaker combination is made up of two traditional cone loudspeakers and two distributed mode speakers.

(d) traditional cone loudspeaker adopts is that the model of Genelec is the integrated 40W monitor of amplifier of 1029A.Technical data: bass 5 " driver elements; High pitch 3/4 " metal dome driver element; Crossover frequency is 3.3KHz; Frequency response range is 70-18000Hz.

(e) distributed mode speaker of Cai Yonging is made by Amina Technologies Co., Ltd (top mention), is made up of aluminium core, polyester casing and 4 exciters (each exciter power is 10W) of 610mm * 492mm size.Each distributed mode speaker is the open type rear board that a rated power is 40W.Its frequency response range is 80Hz-20KHz.

(f) measure for LEF, we have used the microphone of the model of a kind of CALREC Soundfield as ST250.Measure for IACC, the model that we have used a kind of B+K measuring head and Torsor Simulater is 4100 microphone.

(g) for these measurements, use a kind of maximal length sequence signal, and asked for its impulse response, also carried out the space measurement of impulse response.The software that uses is the Cool Edit Pro program of the band Aurora plug-in unit of PC version.

(h) distributed mode speaker and cone loudspeaker are driven and are used in the equal substantially sound pressure level of microphone place generation.

Listener is arranged in the listening space such as a music hall, receives directly from the acoustic energy of sound source (for example symphony orchestra) with through the acoustic energy of listening space edge reflection.The ratio that the energy of returning from the listening space edge reflection that the listener receives in about 50 milliseconds time after receiving the direct sound from sound source accounts for gross energy is known laterally early stage energy mark (LEF).Because upper frequency is absorbed manyly than lower frequency, the general simultaneously little energy that also comprises than lower frequency, thereby the reflected energy of the overwhelming majority is in the low-frequency range.In the conventional art, on a series of frequency bands, carry out measurement to LEF, particularly at following frequency band:

88Hz to 176Hz (being called 125 octave bands)

176Hz to 353Hz (being called 250 octave bands)

353Hz to 707Hz (being called 500 octave bands)

707Hz to 1414Hz (being called 1000 octave bands)

People generally believe, in the music hall environment, and are in the limit range, and the LEF in these frequency bands is high more, and the space in people's impression is broad sympathetic high more.Because target of the present invention is to create the impression that the broad sense in a kind of space increases, we have measured by driving the LEF of the associating sound field that distributed mode speaker and cone loudspeaker produce simultaneously, and the LEF that it is recorded during with individual drive distributed mode speaker and cone loudspeaker respectively compares.

Fig. 1 is a block diagram that shows result of the test.As can be seen from the figure, draw the post 500a of vertical hachure, 500b, 500c, 500d show the LEF that uses cone loudspeaker to record separately in each octave band of definition in the above respectively.The post 502a to 502d that draws the level hachure shows the LEF that uses distributed mode speaker to record separately in same octave band.Draw cross-hatched post 504a to 504d and show the distributed mode speaker of use design in identical octave band and the LEF that the cone loudspeaker combination records according to the present invention.

As can be seen from Figure 1, in each octave band, by the LEF of the distributed mode speaker of design and the sound field of cone loudspeaker combination results according to the present invention all significantly than the LEF height of the sound field that produces separately by cone loudspeaker.Thereby, Fig. 1 shows, compare with independent use cone loudspeaker, the obvious raising aspect the broad sense in space that people use the fashionable subjective sensation of set of speakers of the design according to the present invention to arrive, be consistent than this fact that the LEF of the latter's sound field increases to some extent with the LEF of the former sound field in above-mentioned octave band, this is also with to improve this viewpoint that is extensively received of the broad sense in space that the LEF in these frequency bands can improve in people's impression in the music hall environment consistent.In other words, difference by the speaker combination that designs according to the present invention sound field that produces and the sound field that is produced separately by cone loudspeaker is, one be considered to improve people's impression in the relevant important parameter (LEF) of the broad sense in space on, the former increases to some extent than the latter.We think, this can be used as a conclusive evidence of following reasoning, the subjectivity of promptly mentioning is in the above listened in the test, compare with independent use cone loudspeaker, the set of speakers that use designs according to the present invention is fashionable, and the increase of the broad sense in space that people feel is that the former has created a physically different sound field relatively because of the latter.

Can notice equally, in 125 and 250 octave bands, reproduce big in the difference amplitude on the LEF more than the two LEF difference in 500 and 1000 octave bands between speaker combination and the cone loudspeaker.And this characteristic is relevant with the increase of the simple and honest property of sound.Express with different modes and to be exactly, if in four octave bands, LEF difference amplitude as shown in Figure 1 is all identical, just show, the broad sense in space is improved, but the simple and honest property of sound does not but strengthen.

Can notice also that from Fig. 1 in all four frequency bands, the LEF when the using distributed mode speaker separately all LEF than independent use cone loudspeaker is big.In 125 and 250 octave bands, the LEF when using distributed mode speaker separately is littler than using the fashionable LEF of set of speakers.In 500 and 1000 octave bands, use distributed mode speaker separately and use fashionable both the LEF amplitude of set of speakers close, thereby in these octave bands, it almost is ND using the difference of the broad sense in space that both show.These result's hints, also listening to test by subjectivity is simultaneously confirmed, compare with independent use distributed mode speaker, it is remarkable not as its increase that obtains in the broad sense in space than independent use cone loudspeaker that the set of speakers that use designs according to the present invention is combined in the increase that obtains in the broad sense in space, and the broad sense height in space that produces than cone loudspeaker of the broad sense in space that produces of distributed mode speaker.Yet important part of the present invention is, when keeping fidelity, with respect to independent use cone loudspeaker, is obtaining significant raising aspect the broad sense in space.Should remember that distributed mode speaker is not used widely in the occasion of the fidelity that needs high level as yet.

Binaural cross-correlation coefficient (IACC) is that a kind of of degree of correlation of sound pressure signal that listener's ears are received measures.Therefore, use a dummy head to measure IACC traditionally, and this dummy head has hole with the corresponding position of people's duct, and in each hole, be placed with microphone.Generally believe that in the one or more frequency bands in 1000,2000 and 4000 octave bands, the broad sense of low numerical tabular prescribed space of this coefficient correlation strengthens to some extent.The numerical value of above-mentioned these octave bands is as follows:

1000 octave bands: 707 to 1414Hz (above mention)

2000 octave bands: 1414 to 2825Hz

4000 octave bands: 2825 to 5650Hz

Fig. 2 is a block diagram that shows the result of the IACC measurement of carrying out in first test.In Fig. 2, draw the post 506a to 506d of vertical hachure, draw the post 508a to 508d of level hachure, and draw cross-hatched post 510a to 510d and show respectively in four octave bands, be i.e. the fashionable IACC of set of speakers that uses cone loudspeaker separately, uses distributed mode speaker and use design separately in 500 octave bands (in the above-mentioned introduction relevant, mentioning), 1000 octave bands, 2000 octave bands, 40000 octave bands according to the present invention with LEF.Find out easily that from figure in 1000,2000,4000 octave bands, the IACC value when using the fashionable AICC value of the set of speakers of the design according to the present invention obviously than independent use cone loudspeaker is low.Owing to explained that promptly the numerical value of this coefficient was low more in these frequency bands, the space is broad sympathetic high more in people's impression, thereby above-mentioned phenomenon is the same with LEF numerical value, and another shows that the broad sense in space increases.

Although comprised the IACC value that in 500 octave bands, records among Fig. 2, but these data are actually irrelevant, because owing to understandable reason, the energy that the acoustic energy wavelength in this frequency band makes us can estimate that listener's ears receive will have higher coefficient correlation.

Therefore as can be seen, LEF that records on the stereo that in test for the first time, uses and IACC with listening to test in people consistent to the subjective impression of the broad sense in space.

Second experimental details (monophony)

Second test is under following condition, and array apparatus carries out under using:

(a) the test room is by through Acoustic treatment, and absorbing the sound that surpasses 10000Hz, and be 0.3 second its reflection interval.The size in this room is meter wide * 2.4,5.6 meters long * 3.2 meter high=43.28 cubic metre volumes.

(b) microphone that uses in these are measured is placed on the loud speaker axis apart from 1.5 meters places far away of loud speaker.The front surface of distributed mode speaker is vertical substantially with the rear surface of traditional cone loudspeaker case.

(c) cone loudspeaker of Cai Yonging is that the model of Tannoy is the two monitors with one heart near field of 6NFM MARK II, and its frequency response range is 44Hz to 20KHz.The advantage of this kind unit is that its HF and LF are in a last same point during measurement.The distributed mode speaker panel that adopts is produced by Amina Technologies Co., Ltd, and comprises the honeycomb refill that is impregnated with resin of a 500 * 700mm and the casing with 4 exciters (each exciter power is 10W).Each distributed mode speaker is the rear board of an open type, and its frequency response range is from 80Hz to 20KHz.

(d) measure for LEF, but we have used the Variable Polarity microphone of the model of a kind of AKG company as C34.Measure for IACC, we have used a kind of Neuman ears measuring head.

(e) we extract frequency response and spatial data once more from a kind of maximum length signal here.The software that adopts is the MLSSA software of PC version.

(f) adopt an independently amplifier, the sound pressure level of distributed mode speaker panel is arranged to hang down 4.2 decibels than the sound pressure level of Tannoy cone loudspeaker.

Fig. 3 and Fig. 4 show the LEF that records and the block diagram of IACC in second test.And the hatching mode of its post have with Fig. 1 and Fig. 2 in the identical implication of hatching mode.Thereby, LEF and IACC when post 512a to 512d among Fig. 3 and the post 518a to 518d among Fig. 4 have represented independent use cone loudspeaker respectively; LEF and IACC when post 514a to 514d among Fig. 3 and the post 520a to 520d among Fig. 4 have represented independent use distributed mode speaker respectively; LEF and IACC when the post 516a to 516d among Fig. 3 and the post 522a to 522d among Fig. 4 have represented the distributed mode speaker that uses the design according to the present invention and cone loudspeaker combination respectively.The same with Fig. 1 and Fig. 2, each post among Fig. 3 and Fig. 4 has been represented the correlation in a specific octave band, as shown in FIG..

Examining Fig. 3 can find, in each octave band, the LEF value of the speaker combination of design is all than the LEF value height of independent traditional cone loudspeaker and independent distributed mode speaker according to the present invention.As having explained the front, this phenomenon is corresponding to listening in subjectivity that people feel in the test the broad sense in space improves.And the difference amplitude between post 516b and the 512b shows that than big this fact of the difference amplitude between post 516c and the 512c (the LEF values in 250 and 500 octave bands) the simple and honest property of sound is significantly improved.

Fig. 4 shows that in 1000 and 4000 octave bands, the IACC value of the speaker combination of design is low more than the IACC value of independent cone loudspeaker according to the present invention.This phenomenon is consistent with the raising of people's broad sense in observed space, yet in 2000 octave bands, IACC value 518C almost is identical with 522C.And the same as place of matchmakers's explanation of being correlated with Fig. 2, the IACC value in 500 octave bands shown in Fig. 4 has nothing to do.

Fig. 3 and shown in Figure 4ly listen to the subjectivity of in second test of using the monophony system, carrying out all that the broad sense in the space in people's impression improves consistent in the test.

The 3rd experimental details (monophony)

Test is used with devices different during first and second test and is carried out in the environment different with above-mentioned first and second tests.This test is included in the subjective testing that uses a kind of single channel (monophony) device in the disadvantageous acoustic enviroment (top this is introduced), and the frequency response measurement that carries out in an anechoic room.In the test, do not carry out LEF and IACC and measure.

The traditional cone loudspeaker that uses in these are measured is the passive studio listen device of the model of a kind of JBL as LSR32, and it comprises that three have covered from the driver element of the frequency range of about 30Hz to 20KHz.And the distributed mode speaker that uses is produced by Amina Technologies Co., Ltd.This distributed mode speaker panel is made of a honeycomb refill and a glass fibre casing that has flooded resin that has flooded resin, and its size is 60cm * 60cm.And wherein also be furnished with 4 electromagnetic drivers, its frequency response range is 80Hz to 20KHz.

This distributed mode speaker panel is placed on the conventional loudspeakers top, and with the very strong two-sided tape of viscosity.Pink noise is used as the test signal of all measurements, to guarantee keeping enough signal to noise ratios (pink noise is a kind of wideband random signal, and it comprises equal signal energy on the bandwidth of each octave) on the frequency of all concerns.Come the output signal of automatic signal generator to be connected to a binary channels power amplifier, so that the signal of suitable frequency scope is delivered to each loud speaker by a pair of universal filter group.The relative output level of two loud speakers is regulated with driver convertible attenuator in line by one, and is sent to the amplifier that power is provided for conventional loudspeakers.

The response of axle upper frequency

Fig. 5 shows the axle upper frequency response amplitude of traditional cone loudspeaker, and Fig. 6 then shows the axle upper frequency response amplitude of distributed mode speaker.According to manufacturer's suggestion, we have removed the LF-response part that is lower than 100Hz of distributed mode speaker panel.Online attenuator is adjusted with in the axle upper frequency response levels much at one that provides in the scope of 500Hz to 5KHz from two kinds of loud speakers.

On a computer, to consider phase place and not consider that two kinds of situations of phase place superpose to the frequency response shown in Fig. 5 and Fig. 6.Through the frequency response of above-mentioned processing gained with use more clearly the showing of being done between the fashionable frequency response of set of speakers, the phase place addition occurred between two kinds of loud speakers, thereby also had the phase mutual interference.And this means, also be amazing simultaneously, the frequency response of the merging output of two kinds of loud speakers can accurately be determined by the frequency response addition that under the situation of considering phase place various loud speakers is recorded separately.Because the existence of this situation, we just may with arbitrarily relatively output level determine the frequency response of speaker combination.Fig. 7 shows the frequency response of speaker combination, it be change to from-12dB with the step-length of 3dB with respect to the conventional loudspeakers output level at the distributed mode speaker output level+situation of 12dB under, by aforesaid computer the frequency response of these two kinds of loud speakers is carried out that addition obtains.

Subjective assessment

We used with measure in identical device two kinds of loud speakers have been carried out subjective testing, but test is (the aforesaid corridor that is used for tackling sound wave) in a half reflection space, rather than carries out in anechoic room.

All are listened to test and carry out on the monophony device of a use broadcast from the different music recording of many kinds of CD disc.At first, when distributed mode speaker is access in and withdraw from, feel significant change in the broad sense in space.Experimenter's approval is compared with independent use cone loudspeaker, adds the distributed mode speaker panel and can improve the broad sense in space.Secondly, we regulate the relative output level of two kinds of loud speakers, assert one corresponding to the improved best relative level of feeling up to the experimenter is consistent.And this keeps a stable comprehensive output level to realize by using amplifier " balance " control.Experimenter's approval, the output level of distributed mode speaker panel are lacked 5dB than the output level that uses (equal voltage levels of using) and are provided with for best from 500Hz to 5000Hz in above-mentioned measurement.The experimenter is this best value of setting of approval in the scope of ± 3dB.

The another test of being done comprises the threshold value of setting up relative level, when a kind of loud speaker is access in and withdraws from and another kind of loud speaker when keeping original state constant, surpasses this and is worth us and will experiences variation less than sound.Very fast definite, be-35dB that for conventional loudspeakers, its detection threshold is-20dB for its detection threshold of distributed mode speaker panel.

Discuss

The frequency response measurement value clearlys show that the frequency response of distributed mode speaker panel is level and smooth not as the frequency response of traditional cone loudspeaker.Consider different acoustic transmitter systems, this also not exclusively allows the people be surprised.Simultaneously, the frequency response of distributed mode speaker panel has one significantly to fall after rise at about 7KHz place.Yet, distributed mode speaker panel and the conventional loudspeakers degree of mutual interference mutually surprisingly.The distributed mode speaker panel is launched sound in their mode, is to disperse because the oscillator field of its panel surface top is approximate in itself.Therefore, expect that it is very reasonable not having specific phase place to be associated with the emission sound field; Yet, the result of these measurements but shows, at least in the space a bit on and in a narrow frequency band (if not whole audio frequencies) this panel have one and can record and phase response repeatably, and this produces constructive interference to the acoustic radiating from another loud speaker.

Fig. 7 shows the frequency response of the merging output of two kinds of loud speakers when the distributed mode speaker output level changes with respect to the output level of traditional cone loudspeaker.As was expected, and low level distributed mode speaker output is for the almost not influence of frequency response of traditional cone loudspeaker, and under higher relative level, frequency response is then played a leading role by the part from distributed mode speaker.Yet the most interesting among this width of cloth figure a bit is a certain relative output level between two kinds of loud speakers, and on this level, the frequency response of traditional cone loudspeaker should be smoother, but be subjected to the interference of Speaker panel output this moment.This figure shows, in this test, for surpassing-relative level of 3dB, the frequency response of cone loudspeaker will be subjected to the adverse effect of distributed mode speaker panel, yet under lower relative level, situation but is not like this.This conforms to people's subjective observation, and promptly for the tonequality of wanting, the relative level of-5dB is near optimum; Thereby higher distributed mode speaker output level will improve the broad sense in space, but the frequency response variation that also will make comprehensive output, people can obtain compromise between these two.

Conclusion of this test and summary thereof

With the same in first and second tests, subjective testing shows that the broad sense in space is significantly improved.And these tests are to use in the monophony system with loud speaker a disadvantageous acoustic enviroment to carry out.Frequency response measurement and calculating shows, the set of speakers of design is combined under the drive signal effect of appropriate level according to the present invention, can obtain than the frequency response of independent distributed mode speaker superior the frequency response of Duoing.

Embodiment

We can learn from above-mentioned discussion about the test carried out, subjective testing and scientific measurement all show, by adding distributed mode speaker, and needn't add extra signalling channel and use complicated signal coding technology, the present invention provides the solution of a practical simplicity for solving the problem that improves the broad sense in space that is produced by loud speaker, particularly it can be accomplished when adopting a kind of piston type loud speaker of high-quality wide operating frequency range, can improve it and produce the broad sense in space, can not sacrifice the fidelity of sound again.

The present invention is applied in the middle of the reality, and then distributed mode speaker and piston type loud speaker must operate on the total part of sonic-frequency band.Preferably, two kinds of loud speakers all are operated on the almost whole sonic-frequency band, for example the piston type loud speaker can be operated in the frequency range from 20Hz to 20KHz, and distributed mode speaker can be operated in the frequency range from 100Hz to 20KHz, perhaps, when the technology of distributed mode speaker obtained further developing, two kinds of loud speakers all can promptly be worked from the scope of 20Hz to 20KHz in whole audio range.Scope of the present invention comprises and depends on its environment, as cost and desired use, and adopts than narrow-band.For example, distributed mode speaker may be limited to one much narrower as to work in the frequency band range than above-mentioned frequency band, for example from the frequency band of 100Hz to 1000Hz, or from the frequency band of 200Hz to 2000Hz, or comprise one or more its scopes that comprise up to 4000Hz or up to a frequency range of the octave band of 6000Hz.By one more specifically example this point can be described, distributed mode speaker or distributed mode speaker group's frequency band can be from 100Hz to 6000Hz, and the frequency band of piston type loudspeaker cluster can be from 800Hz to 8000Hz.

As another possibility, suppose distributed mode speaker and piston type speaker operation a total part in certain frequency range, then the maximum operating frequency of piston type loud speaker can be more much lower than the maximum operating frequency of distributed mode speaker, so that in the highest frequency part, high pitch loudspeaker only is made of distributed mode speaker.

Therefore, in the ordinary course of things, the operating frequency range of distributed mode speaker can be wideer or narrow than the operating frequency range of piston type loud speaker.The lowest limit operating frequency of the frequency range of distributed mode speaker can be lower or high than the lowest limit frequency of the frequency range of piston type loud speaker: and the upper limit (UL) operating frequency of the frequency range of distributed mode speaker also can be lower or high than the upper limit (UL) frequency of the frequency range of piston type loud speaker.For different purposes and different markets, depend on application and cost and specific (special) requirements, can decide the frequency optimum traffic scope of piston type loud speaker and distributed mode speaker by test.

Below, will be introduced a series of embodiment of the present invention.In most embodiment, will not provide concrete frequency.These frequencies are selected in the use occasion of the specialities that should design according to the introduction to these embodiment in the frequency range of mentioning from above-mentioned discussion.Same, the placement location in the time of also can not describing loud speaker in following examples or audio reproducing apparatus work will be by the optimum position of the user of sound system or setter decision these equipment in any special listening space.When distributed mode speaker is separated with the piston type loud speaker physically, two kinds of loud speakers can be placed on the adjacent position, also one of them can be put into another top or other positions, for example, distributed mode speaker can be placed on the back or the side in the zone of reserving into the listener.Should know, in ambiophonic system, the riding position of loud speaker is very crucial, and depends on the coding of signal in different passages, and sort signal coding is to carry out under the hypothesis loud speaker is in the prerequisite of the position of predesignating, but the present invention is not retrained by this.

Also should know, test (not mentioning in above-mentioned introduction to test) shows, can between the output of piston type loud speaker and distributed mode speaker, introduce a time-delay, particularly, can deliver to the signal of piston type loud speaker with respect to those, the signal of delivering to distributed mode speaker is delayed time.In the occasion of introducing time-delay, time-delay generally should not surpass 80ms, preferably is no more than 35ms.In unofficial test, people find, introduce " imaging " or " location " that this time-delay can strengthen sound in stereo applications or surround sound application.When people listen to music, this definition of having improved sound in the imaging and the raising aspect the location of sound.

Why this improvement appears, be because time-delay has caused the transient process of the sound that the piston type loud speaker produces not to be distributed the transient process shielding of the sound that the formula loud speaker produces, and the transient process of the sound that the transient process of the sound that distributed mode speaker produces is produced by the piston type loud speaker shield.

Although in the relevant discussion of influence above-mentioned and LEF and IACC and time-delay, provided some theoretical explanations, should know that the applicant is not subjected to the constraint of these explanations about these influences.The explanation that has provided is to be based upon on current knowledge of field of acoustics and the Foundation of Measurement Technology, but should know and recognize, the sound that the mankind touch is an extremely complicated theme to their psychologic acoustics influence, is difficult to this (in some cases can not) be made explanation accurately.

Now, some embodiments of the present invention are introduced.

First embodiment

Fig. 8 to Figure 12 shows the stereophonics system according to first embodiment of the present invention design.

As shown in Figure 8, this system comprises some input units 2, as a CD Player, and a stereo FM tuner and/or a stereotape player; Stereo amplifier unit 4 with a conventional construction, thereby just comprised common preamplifier, control circuit and power amplifier, and a pair of loud speaker output unit 6 that is connected respectively to the left and right acoustic channels output of amplifier 4 of reproduction of stereo sound such as music.Each loudspeaker unit 6 comprises traditional cone loudspeaker and distributed mode speaker that elaboration according to the present invention drives.These two loudspeaker units 6 are identical.

As shown in Figure 9, each loudspeaker unit 6 comprises a casing 8 that comprises traditional full rate two-way cone loudspeaker system, and this cone loudspeaker system is made up of a fundamental frequency/mid frequency ludspeaker 10 and a high pitch loudspeaker 12.Comprise an electromagnetic drive unit in the

cone loudspeaker

10 and 12 separately, this unit or belong to moving coil type, or belong to the moving magnet type, and be used to drive awl basin separately.Casing 8 has the place ahead, rear, top, bottom and side panel 8a, 8b, 8c, 8d, 8e, 8f.Have hole 14 and 16 on the panel 8a of the place ahead, disposed the awl basin of

loud speaker

10 and 12 in the back, hole.

Loud speaker

10 and 12 awl basin have sealed hole 14 and 16, make casing 8 form a closed cells as in the conventional art, and the configuration mode of cone loudspeaker makes these loud speakers produce sound with a kind of traditional approach in air in this cell.Closed cells inside in the casing 8 can comprise any traditional structure or attenuating material.

Vertically fixed a distributed mode speaker 22 at the top of casing 8, this loud speaker is made up of a Speaker panel 24 and an electromagnetic driver 26 that appends to panel 24 rear portions.One is fixed to rectangular frame 28 on the casing 8 along edge 30 and panel 24 is supported in substantially in the plane at front surface place of casing 8, and this support pattern allows exciter 26 that panel 24 is activated to the distributed vibrational state of known resonance type.

Panel 24 and framework 28 have formed the antetheca of the casing 32 that is placed on casing 8 tops, and the side of this casing, rear and roof 32a are all made by the wire netting that comprises many apertures, so that the sound that the rear surface of panel 24 produces can quite freely pass the net wall and be transmitted in the air.

Exciter 26 is wrapped in bobbin 34 by 34, one of a columniform non magnetic light-duty hard bobbin and is made up of the electric coil 36 that bobbin 34 supports, and all these are all shown in the cross-sectional view of the signal in Figure 10.Magnet 38 is actually cup-shaped, and by a kind of circular distal or base wall 38a, the central magnetic core of an a kind of cylindrical side wall 38b and a solid cylinder is formed.Soft submitting to property material is fixed between the inner cylindrical surface of the central magnetic core 38c of magnet 38 and bobbin 34 by adhesive, to support magnet with respect to bobbin with submitting to, make when coil 36 is carried out excitation by a kind of alternation electric signal, the electromagnetic force that obtains is had an effect between coil 36 and magnet 38, thereby causes the relative vibration between bobbin 34 and the magnet 38.With top described different, and the distributed mode speaker technology is the same as is known, and magnet is without supporting, but it is heavy more than bobbin, thereby the mechanical inertia that has because of the weight of magnet 38 makes vibrational energy be passed to panel 24.The distributed mode speaker technology is the same as is known, for providing extra support, magnet 38 (a kind of so extra support is not shown among Figure 10, do not comprise a kind of like this support in the present embodiment yet) be possible, still, this structure must allow magnet to vibrate.

The panel 24 that schematically illustrates among Figure 10 comprises the honey comb structure of an inside, and this structure comprises the passage that extends to its place ahead from its rear, and these passages are respectively by front surface layer 24b and rear surface layer 24c sealing.This structure is according to being applicable to that the design principle of distributed mode speaker chooses, requiring it in light weight, and as top the introduction, it can be excited to the distributed vibrational state of the resonance type that exists with the bending wave form under the excitation of exciter 26 in requirement.According to the design principle that is applicable to distributed mode speaker, this structure has been carried out suitable design, and is placed among the panel to realize above-mentioned purpose.

Just as has been noted, in order to allow to produce these vibrations, be installed in the framework 28 to panel 24 submitting to property of quilt.Figure 11 has illustrated an example for this reason and the suitable cooperation seating means that adopts, and promptly the foam plastics strip 40 of a softness is cemented between the fringe region 24d of panel 24 and the rear surface 28a of framework 28 (shown in L shaped cross section part among the figure).There is discontinuous part in foam-plastic blocks 40, and is connected to the regional 24e of panel 24 without any attachment device, thereby the fringe region 24e of panel 24 can free vibration.According to the design principle that is used for distributed mode speaker, the regional 24d and the 24e that choose panel 24 obtain optimization so that this panel is excited to the ability of the distributed vibration of resonance type.

As shown in figure 12, each loudspeaker unit 16 comprises and a pair ofly is connected to the input terminal of the output of the traditional amplifier 4 shown in Fig. 8 by suitable lead, and this terminal offers cone loudspeaker 10 and 12 and distributed mode speaker 22 with drive signal.These signals are added to bass cone loudspeaker 10 and high pitch cone loudspeaker 12 respectively by low pass filter 44 and high pass filter 46, thus combination and constitute traditional frequency dividing circuit.These signals offer distributed mode speaker 22 by a high pass protecting filter and attenuator circuit 48.We design and dispose cone loudspeaker 10 and 12 and filter 44 and 46 in a kind of specific mode, so that loud speaker 14 and 16 can reproduce the most sound in the whole audio range of 20Hz to 20KHz together, thereby constituted the cone loudspeaker system of a routine.Consider in the current technical development stage; distributed mode speaker can not; at least on the whole can not reproduce the fact of the sound that is lower than the 100Hz frequency efficiently; we also design and dispose the distributed mode speaker with the high pass protecting filter that is comprised in the circuit 48 in a kind of specific mode, so that it can produce the sound in the whole audio range as much as possible under situation about conforming to the actual situation.Thereby circuit 48 is configured to remove the signal that is lower than 100Hz, so that distributed mode speaker 22 can reproduce the sound frequency that is in 100Hz to the 20KHz scope.An attenuator is included in the circuit 48, so that the sound pressure level that distributed mode speaker 22 produces is lower than by cone loudspeaker 14 and 16 sound pressure level that produce.For example, (in the context of the above-mentioned test of having carried out, obtained explain), sound pressure level that adds, subtracts 3dB on the basis at-5dB is desirable sound pressure level difference between the two.Thereby, if its parts workmanship is enough good, with independent conventional loudspeakers, independent distributed mode speaker and a kind of getable acoustic phase ratio of cone loudspeaker combination that only is used as the distributed mode speaker of high pitch loudspeaker therein and is used as woofer, embodiment shown in Fig. 8 to Figure 12 can provide the music reproducing system of the improved high-fidelity of the broad sense in a kind of space.

High pass filter attenuator circuit 48 preferably can be adjusted by the user, so that it can be provided with different level of attenuation by heuristic according to the acoustic condition in its preference and room.Equally, this circuit preferably also can be adjusted, so that it can introduce the time-delay of 0 to 35 millisecond of scope in being added to the signal of distributed mode speaker.

In use, can place the loud speaker in the system shown in Fig. 8 to 12 with a kind of traditional mode, but must guarantee that distributed mode speaker can launch sound again forward backward, promptly can not allow loud speaker the rear portion directly by on may hinder the sound that sends from distributed mode speaker to propagate backward wall or other article.

Second embodiment

Figure 13 shows another embodiment of the present invention, in this example, in a traditional hi-fi music playback system that comprises foregoing traditional input unit, traditional stereo amplifier and a pair of traditional cone loudspeaker 50, increased a pair of auxiliary sound reproduction units 52, one is used for right passage, one is used for left passage, so just traditional hi-fi system has been transformed into a system based on the present invention's conception.

Each auxiliary unit 52 comprises a distributed mode speaker 54 and the Signal Regulation amplifier 56 with input terminal 58 of the left and right loud speaker output that is connected respectively to amplifier 4, and the latter's lead-out terminal 60 is connected to corresponding distributed loud speaker 54.Each Signal Regulation amplifier is powered by the main power source shown in Reference numeral among the figure 62.For simplicity, input terminal 58 can be connected respectively to the terminal of loudspeaker unit 50 by short lead, has so just avoided being connected into extra long lead between the input of the output of amplifier 4 and auxiliary unit 52.

Figure 14 is the block diagram of each Signal Regulation amplifier 56.As shown in the figure, an attenuator 64 is linked input terminal 58, and signal is offered a numerically controlled volume control circuit 66, and the latter's output is sent to the power amplifier 70 that its output is connected to terminal 60 by one seven band equalizer 68.

Attenuator 64 comprises a high resistance measurement that is connected to terminal 58, and this terminal has a tap 74, so that the top low level signal of mentioning is delivered to digital volume controller 66.For resistance 72 has been selected an appropriate resistance value, so that Signal Regulation amplifier 56 and to pass the coupling part total impedance and the total impedance that loud speaker 50 provides separately of loud speaker 50 of lead-out terminal of amplifier 4 approaching as far as possible, so that amplifier 4 can be subjected in it and the adverse effect that also it is linked to each other with auxiliary unit outside traditional cone loudspeaker links to each other.Seven band equalizer comprise that some are used for preestablishing the default control device 68a of the relative magnification ratio that will be applied to seven different frequency bands.We choose the set point of controller 68a in a kind of specific mode, so that it can compensate any variation of distributed mode speaker 54 frequency responses at least on some degree, and excise any lower frequency composition, as be lower than the frequency of 100Hz, because perhaps distributed mode speaker can not reveal gratifying sound again in this frequency range.

Microcontroller 76 control figure formula volume control circuit 66, equalizer 68 and a power amplifier 70.And microcontroller 76 can and a kind ofly be handled the signal that is used for the infrared detector that hand-held remote control device (figure does not illustrate) that volume regulates responds by the user of system conversely, and the user of this system can regulate the sound of distributed mode speaker generation with respect to the sound that cone loudspeaker produces.For the electric energy of avoiding waste, device 56 is manufactured into, and when sending it to less than the signal from amplifier 4, it will enter a kind of power-down mode.An input detector circuit 82 is connected to shunting switch 74, and the signal that shunting switch 74 places occur reacted, when sensing this signal, it just delivers to microcontroller 76 with a control signal, even the program of latter's configuration enters one with it and adds power mode, circuit will be worked under this pattern.

In the embodiment shown in Figure 13 and 14, traditional cone loudspeaker 50 is worked on whole frequency range, and distributed mode speaker is worked in big as far as possible scope, as what mentioned in the discussion relevant with the embodiment of front, thereby, shown in attached Figure 13 and 14, in existing high fidelity sound sound reproduction system, add a pair of auxiliary unit, just existing system can be converted into an improved system that has implemented the present invention and improved the broad sense in space.

Thereby auxiliary unit 52 can be independent of to be made as a whole hi-fi system and makes and sell, and they just be introduced in the existing hi-fi system like this.The Signal Regulation amplifier can physically be installed on the pedestal or in a casing.And this pedestal or casing also can be used as the supporting of distributed mode speaker or are separated with it.

In addition, although Figure 13 illustrates two Signal Regulation amplifiers 56 separated from one another, a kind of twin-channel Signal Regulation amplifier is provided, its each passage comprises input attenuator 64, digital volume controller 66, equalizer 68 and the power amplifier of having introduced 70, but a microprocessor controls two passages.In this configuration, input detector can be connected to two input attenuators, and is configured to when sensing at one of two passages or the signal that occurs on two passages, and it just can impel circuit to enter a kind of power mode that adds.A kind of like this double-channel signal amplifier, its all parts all can be included among the independent casing, and this casing can be integrated into be used for one of distributed mode speaker or as the pedestal or the supporting box of the article that separate manufacturing with distributed mode speaker.Provide single microcontroller also can reduce cost.

In order to simplify the operation that auxiliary unit 52 is connected to existing sound reproduction system as far as possible, can be each auxiliary unit 52 extra lead-out terminal (not illustrating among the figure) is provided, these terminals are directly connected to input terminal 58, and are used to be connected to distributed mode speaker by a short lead (not illustrating among the figure) that can be included in the aforesaid auxiliary unit.In the aforesaid modification that two Signal Regulation amplifiers are provided, can there be the so extra lead-out terminal of two covers, every cover terminal is used for a passage.

The 3rd embodiment

Figure 15 illustrates the modification that the input of circuit shown in Figure 14 is done, this is in order to allow the Signal Regulation amplifier not only to receive to be in the input of higher (loud speaker) level (Pei Zhi occasion as shown in Figure 14), also to receive the input that is in line level.For this purpose, a line level input terminal 82 is connected to an input of input switch 84, and another input of the latter is connected to the output of attenuator 64.Input detector circuit 80 is replaced by input detector circuit 86, and this detector circuit has two inputs, and one is connected to tap 74, and another is connected to line level input 82.The signal that input detector circuit 86 is configured to indicate when signal appears in line level input 82 or tap 74 places is sent to microcontroller 76, and microcontroller is configured to explain this signal and input switch 84 correctly is set, and makes the latter that its output is connected to circuit input or tap 74.As shown in figure 14, microcontroller also responds the signal from input detector 86, circuit is entered add power mode.

The same with embodiment shown in Figure 14, as previously mentioned, two passages about can in single unit, disposing, and available single microcontroller is controlled them.

Similarly, as previously mentioned, also can provide to be directly connected to input terminal 58 and the extra lead-out terminal that is used to be connected traditional cone loudspeaker 50, to simplify the operation that auxiliary unit is connected to existing sound reproduction system.

The 4th embodiment

The hi-fi system with traditional that Figure 16 shows another form is converted into the auxiliary unit of embodiments of the invention.In Figure 16, traditional high-fidelity unit comprises input unit 2 and traditional amplifier 4 and a pair of traditional cone loudspeaker 50, in the present embodiment, supposes that this a pair of cone loudspeaker is higher than the distributed mode speaker efficient that will add.Therefore, left and right auxiliary unit 88 has been shown among Figure 16, each auxiliary unit comprises the distributed mode speaker 54 and the attenuator circuit 92 that connects input terminal 90 and lead-out terminal 94 that are connected to input terminal 90, and wherein lead-out terminal is used to connect traditional cone loudspeaker 50.

Configuration supposition shown in Figure 16 is when all loud speakers are connected into, and the impedance of crossing over terminal 90 is in the amplifier 4 treatable impedance ranges.

The 5th embodiment

Configuration shown in Figure 17 is similar with configuration shown in Figure 16, except the distributed mode speaker 54 of supposing the former than the higher this point of cone loudspeaker 50 efficient.Thereby attenuator circuit 92 is connected between input terminal 90 and the distributed mode speaker 54, rather than is connected between input terminal 90 and the lead-out terminal 94.Embodiment is the same just as shown in Figure 16, supposes when all loud speakers are connected into, and the impedance of crossing over terminal 90 is in the amplifier 4 treatable impedance ranges.

The 6th embodiment

Referring to Figure 18, a kind of sound reproduction system comprises traditional input unit 2, as previously mentioned, stereo amplifier 100 of specially making has the first and second leftstereophonic channel lead-out terminals 102 of linking distributed mode speaker 106 and traditional cone loudspeaker 108 respectively, 104, and the first and second right stereo channel lead-out terminals 110,112 of linking distributed mode speaker 114 and traditional cone loudspeaker 116 respectively.Traditional cone loudspeaker 108 and 116 preferably all is loud speakers of full range scope, and can be two road or three road devices that for example have traditional frequency dividing circuit, makes cone loudspeaker can reproduce from the sound of 20Hz to 20KHz frequency range together.Same, as previously mentioned, distributed

mode speaker

106 and 114 operating frequencies should be able to cover audio frequency as much as possible under realistic situation, and preferably can produce from the sound of 100Hz to 20KHz frequency range as previously mentioned.

As shown in figure 19, amplifier 100 comprises that one is used to receive that the user selects from the input selector circuit 118 of the input of legacy equipment 2, and has left lead-out terminal 120 and right lead-out terminal 122.Left side lead-out terminal 120 is linked left distributed loudspeaker signal treatment channel 124, and their output is connected respectively to the input terminal of the left cone loudspeaker signal processing channel 126 of terminal 102 and 104.Right lead-out terminal 122 is linked right distributed loudspeaker signal treatment channel 128, and their output is connected respectively to the input terminal of the right cone loudspeaker signal processing channel 130 of

terminal

110 and 112.

Passage 124,126,128,130 by a microprocessor controls, and this microcontroller receives the control input from some traditional controllers 136 and a relative volume controller 140.Tradition controller 136 is driven by the user of sound system, can comprise all conventional controllers, as L-R balance controller, high pitch and bass controller and Graphic equalizer controller etc.Volume controller 140 also is used for allowing the user operate relatively, sets as a side distributed mode speaker 106,114 with as the relative volume between the opposing party's the cone loudspeaker 108,116.

Each distributed mode speaker passage 124 comprises seven sections equalizers and the power amplifier that a digital volume controller, band preset, with

parts

66,68 shown in Figure 14,68a, 70 similar.Each

taper amplifier channel

126 and 128 comprises in order to drive the traditional circuit of traditional taper amplifier, for example suitably or when needing, common filter, volume controller (being digital control approach in this example), power amplifier and Graphic equalizer can be arranged wherein.

Four passages 124,126,128,130 of tradition controller 136 controls are to produce the output that needs according to traditional controller 138 (volume, filtering, equilibrium etc.).Volume controller 140 is regulated the relative power level of the signal of delivering to

terminal

102 and 110 on the one hand relatively, regulate the relative power level of the signal of delivering to

terminal

104 and 112 on the other hand, so that distributed

mode speaker

106 and 114 volumes that produce or sound pressure level can be regulated with respect to traditional cone loudspeaker 108 and 116 volume or the sound pressure level that produce, preferably as previously mentioned, the output of distributed mode speaker is set as than the output of cone loudspeaker lacks 5 ± 3 decibels, and consider the characteristic of user preference and room acoustics condition and institute's use loud speaker and other possible values of setting are provided.

Thereby, according to present embodiment, we provide a kind of stereo amplifier that is used for carrying out with above-mentioned distributed mode speaker and cone loudspeaker the novelty of the simple and easy first and second left passages that are connected and the first and second right passages that has, and have so just implemented the present invention.

The 7th embodiment

Figure 20 is the block diagram of another embodiment of the present invention, and this embodiment comprises the audio reproducing apparatus 142 in the machine.Device 142 has the first and second left line level connector bodies 143 that are used to be connected respectively to active distributed loud speaker 145 and active

traditional cone loudspeaker

146 and 144 and the first and second right line

level connector bodies

147 and 148 that are used to be connected respectively to active distributed loud speaker 149 and active traditional cone loudspeaker 150 in this machine.The implication of " active " speech relevant with loud speaker here is and its implication and explanation unanimity among the figure traditionally, and promptly loud speaker is furnished with built-in power amplifier, thereby makes them can be from line level signal reproduction sound.

Transcriber 142 comprises one or more stereo signal source 151 in the machine, for example FM radio tuning device and/or CD Player, and these signal sources have the left and right output that outputs to a left side and

right passage

152 and 153 respectively.Each such passage comprises a volume controller 154, the lead-out terminal of this volume controller is connected to the input of a relative volume control circuit 156 and the input of a main power amplifier 157, and be connected to accessory power outlet 144 in left passage one side, be connected to accessory power outlet 148 in right passage one side.Left and right built-in traditional cone loudspeaker is included in the device 142, and is connected to the output of power amplifier 157 separately by switch 159 separately.Connector 143,144,147,148 preferably are used to accept the standard socket of

standard plug.Socket

144 and 148 and its switch 159 separately between introduced a kind of mechanical connection, make that when plug (not illustrating among the figure) injects these sockets these switches disconnect to disconnect boombox.

Master volume control device 160 by user's operation is controlled the master volume control circuit 154 of two passages simultaneously.Be provided with control piece such as the knob handled for the user and adjust relative volume control circuit 156, make that the user can be to regulate the output of distributed mode speaker with respect to the output of cone loudspeaker.In the present embodiment, suppose that in two relative volume control circuits each has the isolated user control unit of himself, make that the distributed mode speaker in the passage of the left and right sides and the relative volume of cone loudspeaker can be regulated independently of one another.If customer requirements can also be made amendment to circuit, just the relative volume that single control element that is driven by the user of feasible outfit can be regulated left and right sides passage simultaneously.

Preferably, loud speaker 145,146,149,150 audio frequency ranges that reproduce meet front and distributed mode speaker and traditional relevant introduction of cone loudspeaker, and their relative volume can be provided with, as described in the different piece of this specification.

From to the introduction of Figure 20 obviously as seen, distributed mode speaker 145 and 149 can be used in combination with the

cone loudspeaker

146 and 150 of outside, also can be used in combination with boombox 158.

Audio reproducing apparatus 142 can be a kind of mancarried device such as portable radio or portable CD player or portable radio/CD Player in the machine, also can be, for example, television receiver or as the audio system of the computer of portable computer and so on.

The 8th embodiment

Except having omitted built-in loud speaker 158, main amplifier 157 and switch 159 (and relevant mechanical connection of linking socket 144 and 148), embodiment and the embodiment among Figure 20 among Figure 21 are identical.

The 9th embodiment

Figure 22 and Figure 23 show one embodiment of the invention, this embodiment comprises the distributed mode speaker in left side as shown in figure 18 and traditional cone loudspeaker 106,108, and the distributed mode speaker on right side and traditional cone loudspeaker 114,116, and these loud speakers are driven by an amplifier unit 164 as CD player or tape player by a kind of traditional portable music player 165 that has left and right port line level output end 166,167 respectively.

This amplifier unit comprises casing 168, and this casing contains a left side and right passage buffer amplifier 169,170, the first and second left channel power amplifiers 171,172, and the first and second right channel power amplifiers 173,174.Left and right passage input lead 175,176 is connected to

line level output

166 and 167 by

traditional plug

177 and 178 respectively, the input of delivering to buffer

amplifier

169 and 170 respectively with the left side that will be produced by portable music player 165 and right line level signal.Left side channel power amplifier 171 and 172 amplifies independently respectively that buffer amplifier 169 produces is used for driving respectively by

terminal

179 and 180 signal of distributed mode speaker 106 and traditional cone loudspeaker 108.Similarly, right channel power amplifier 173 and 174 amplifies independently respectively that buffer amplifier 170 provides is used for driving respectively by terminal 181 and 182 signal of distributed mode speaker 114 and traditional cone loudspeaker 116.

Four volume control circuits that power amplifier 171,172,173,174 comprises separately are so that the output of four loud speakers can be regulated independently of one another.In the present embodiment, the operating frequency range of distributed mode speaker and traditional cone loudspeaker as previously mentioned, and the difference of the acoustic pressure output of distributed mode speaker and traditional cone loudspeaker also can be regulated in foregoing scope.

Amplifier unit 164 has used a traditional stereo player with line level output, and beyond this traditional stereo player, added two traditional cone loudspeakers and two distributed mode speakers again, thereby make that implementing the present invention becomes possibility.Can be independent of this amplifier unit of miscellaneous part produce and market.During sale, can have or not have the connection lead-in wire.

In a modification, the stereo plug of being furnished with the standard of can accepting when player is during as the conventional socket of " mini plug ", and the single plug 177 shown in Figure 22 and 23 and 178 can be replaced by this plug.

The tenth embodiment

Figure 24 shows the embodiment of audio reproducing apparatus form in another machine of the present invention.Present embodiment has comprised a casing with 185 expressions, has comprised all in this casing and has implemented parts required for the present invention.Therefore, casing 185 has comprised left and right distributed mode speaker 186,187 and has comprised

high pitch loudspeaker

188a and 189a respectively, the traditional cone loudspeaker of the left and right two-way system 188,189 of

woofer

188b and 189b and any convenient divider circuitry 188c and 189c.One or more stereo signal source and required control and loudspeaker driving circuit are represented with Reference numeral 190 summaries, are also included within the casing 185, and have been equipped with the common control piece by user's driving, as volume, balance, high pitch and bass control.The signalling channel that is used to drive and control distributed mode speaker and traditional cone loudspeaker as previously mentioned, thereby it can both comprise a total volume controller, comprised a relative volume controller that is used to regulate relative volume level between distributed mode speaker and the conventional loudspeakers again.

The same as in the previous examples, the audio frequency range that the most of and traditional cone loudspeaker of the audio frequency range that distributed mode speaker produces produces coincides, or preferably the former with the latter much at one, although the audio frequency range of its generation may be littler than the audio frequency range that the hi-fi system of using in the family produces in the device in machine.Device 185 can have any different form in this machine, as portable radio and/or CD player and/or tape player, and a kind of television receiver or a portable computer.When the present invention implemented in a computer, some or all controlled function can realize by software.

The 11 embodiment

In the system that the present invention can be used for so-called " surround sound ".Figure 25 shows a kind of like this embodiment.

Referring to Figure 25, traditional surround sound input unit 191 is connected to one and has traditional surround sound amplifier 192 that five passages are left front, middle the place ahead and right front passage and left channel and right channel, and each passage of the latter is connected to and will be placed on a different separately loud speaker 6 of listening to the correct position in the chamber.Each loud speaker 6 as among Fig. 9 to Figure 13 about as described in the introducing in detail of loud speaker, can in an ambiophonic system, implement the present invention with them.

The enforcement of the present invention in Digital piano

As everyone knows, even current available top quality Digital piano also only can produce musicogenic relatively poor relatively sound.Implementing the present invention in Digital piano can make the more real musical sound of Digital piano generation become possibility.Particularly, the workmanship of supposing piano is enough good, the Digital piano of design can produce the abundant sound of height with random element according to the present invention, and these random elements can stay a kind of impression to the listener, and promptly the sound tonequality of Chan Shenging approaches the sound tonequality that grand piano produced of high-quality acoustic efficiency.And this can use the one-tenth more much smaller than top acoustic piano to realize originally.

Grand piano

Figure 26 shows a perspective view according to the digital grand piano of one embodiment of the invention design.This piano comprises that a qin case 200 that is supported by piano leg 201 is connected cover plate 202 with a conventional hinge that is supported by a traditional strut 203 that is shown in an open position.The pedal 205 that a kind of keyboard 204 and that is generally used for digital piano has overlapped conventional effect is supported in common position by qin case 200.This piano preferably includes traditional high-quality grand piano mechanical device that (as learning) one is connected to keyboard from Digital piano, to give the sensation that a kind of piano that he is played of player is a high quality of music meeting grand piano.

Casing 4 is supported two speaker combination 210 and 212, and wherein each combination comprises high pitch loudspeaker 216, Squawker 214 and the inferior woofer of aiming at high pitch, middle pitch and the bass part of keyboard respectively 218.Loud speaker 216,214, each in 218 all is a kind of traditional electromagnetic drive type cone loudspeaker, and its configuration mode make they the awl basin vertically upward, thereby the sound that their produce just can be reflected by piano lid.For high pitch loudspeaker and Squawker, preferably adopt this orientation, but this orientation not a particular importance for inferior woofer.

Casing 4 has also supported the distributed mode speaker 220 and 222 of two horizontal positioned, so that they can launch sound up and down.In this example, distributed mode speaker 220 and 222 panel size can respectively be 700 * 500mm.

Should know, the loud speaker modes of emplacement shown in Figure 26, promptly conventional loudspeakers be clustered near the place of keyboard and distributed mode speaker away from keyboard, only be a kind of situation that is used for example.Under other situation, traditional loud speaker and distributed mode speaker can be arranged interlacedly, or opposite with shown in Figure 26 just in time of the relative position between them.And high pitch loudspeaker, Squawker and inferior woofer in the conventional loudspeakers combination also can be separate, and arrange with distributed mode speaker interlacedly.

As shown in figure 27, the midi signal that produces from the signal of the infrared ray pick-up 207 that is configured in fingerboard 204 belows from the signal of pedal switch 206 and response is sent to first sound signal generator 230 and rising tone signal generator 231.These two sound signal generators are used for reacting to produce the acoustical signal of reproduction grand piano sound to midi signal with from the signal 107 of pedal switch.Can comprise the traditional computer that is used for this purpose software and realize that first and second acoustical signals take place 230 and 231 by using one.

First sound signal generator 230 in the present embodiment comprises the first high quality samples storehouse 232 and first sound module 234.Rising tone signal generator comprises the second high quality samples storehouse 237, second sound module 238 and physical analogy unit 239.Comprise record in each sample storehouse 232 and 237 from different high-quality grand pianos, the numeral sample of playing piano preferably.Thereby, for example, may comprise the Steinway sample storehouse of a 1.6Gb size in the first sample sound storehouse 232, and may comprise the Yamaha sample sound storehouse of a 30Mb size in the second sample storehouse 237.Sound module 234,238 comprises and is used for according to midi signal that receives and the software program of choosing sample sound from the signal of pedal switch 107 from sample storehouse 232,237.Because the second sample storehouse 237 (in the present embodiment) is much smaller than the first sample storehouse 232, also comprise a physical analogy unit 239 that is used for the sample sound chosen by second sound module 238 with a kind of traditional approach modification in the rising tone signal generator.

Acoustical signal from generator 230 is amplified by an amplifier 240, is used to drive two distributed mode speakers 220,222 through amplifying signal.

Amplify by amplifier 245 from the acoustical signal of generator 231, and be sent to frequency unit 247 and drive two conventional loudspeakers 210,212.Frequency unit 247 passes through high frequency, intermediate frequency and low frequency signal respectively with a kind of traditional approach, and these signals arrive high pitch loudspeaker 216, woofer 214 and the inferior woofer 218 of conventional loudspeakers 210,212 always.

Cone loudspeaker promptly in the overwhelming majority from the scope of 20Hz to 20KHz, or is reproducing sound at whole audio frequency in the scope of 45Hz to 20KHz.Distributed mode speaker in the big as far as possible frequency range in this scope, promptly produces sound from 80Hz to 20KHz or from the scope of 100Hz to 20KHz then under realistic prerequisite.The acoustic condition in residing auditorium or room as previously mentioned or when depending on piano performance, the sound pressure level that distributed mode speaker produces can be adjusted to lower than the sound pressure level of traditional cone loudspeaker generation, perhaps, distributed mode speaker output can be in sound pressure level much at one with traditional cone loudspeaker output even can surpass.In order to make the sound pressure level of distributed mode speaker can be independent of the sound pressure level ground adjusting of traditional cone loudspeaker, be preferably distributed mode speaker and cone loudspeaker and be equipped with volume controller independent of each other, these volume controllers do not illustrate in the drawings.

During playing piano, distributed mode speaker and conventional loudspeakers are driven simultaneously.Thereby, the different air agitation patterns of propagating by distributed mode speaker and traditional cone loudspeaker are united complexity and the abundant air agitation pattern of composition of producing respectively, and this complexity and the rich interaction that stems between the different qualities, with provide sound composition that produces than the loud speaker of single type abundant the sound of Duoing.The rich quilt of this sound further strengthens, and is because the signal that is used to drive distributed mode speaker is different with the signal that is used to drive conventional loudspeakers.

And, combined by distributed mode speaker and traditional cone loudspeaker as the place of matchmakers relevant with above-mentioned test explains, obtaining improvement aspect the broad sense in space.

Although adopted in the present embodiment from two dissimilar grand piano samples, still can be by being used to further to improve the rich of sound from three or more dissimilar grand piano samples, in the case, different loud speakers can by from separately not on the same group the signal of sample drive.In addition, also can adopt sample from other pianos that are different from Steinway and Yamaha grand piano, and preferably adopt current best in quality musical instrument, just comprised sample like this in the sample storehouse that we use from the maximum quantity of the musical instrument that utilizes current state-of-the-art technology to make.Or rather, owing to the Computer Storage volume constantly increases, and its cost constantly reduces, thereby makes that it is possible that the sample Kucheng who comprises increasing sample is provided.Thereby the tonequality that provides also will become and become better and better.

Vertical Digital piano

Referring to Figure 28, the sound tonequality that is produced is poorer than piano shown in Figure 26 and 27, and the vertical Digital piano that cost is also lower comprises a qin case 251 with backboard 252, and this backboard supports a pair of distributed mode speaker 253 and a pair of traditional cone loudspeaker 254.In the present embodiment, be, only to provide two cone loudspeakers with front embodiment forms contrast in order to reduce cost.Distributed mode speaker is configured to the backboard 252 place plane parallel with qin case 251.And on the awl basin axle of two conventional loudspeakers 254 perpendicular to plane, backboard 252 place.

Figure 29 is the schematic block diagram of piano among Figure 28.Compare with the embodiment of front,, only provide the single single sound signal generator that comprises sample storehouse 262 and sound generation module 260 in order to reduce cost.Generator 230 utilizes sample storehouse 262 to produce acoustical signal according to the signal from infrared ray pick-up 207 and pedal switch 107 that receives.

In last embodiment, distributed mode speaker 253 and traditional cone loudspeaker 254 are passed through amplifier 245,247 drive simultaneously, so that pianotron produces a kind of air agitation pattern that is combined by the voice output of distributed mode speaker 253 and conventional loudspeakers 254, thereby can imitate the propagation of the sound that foregoing a kind of audio unit produces more approx.Yet, from Figure 29, can clearly be seen that, do not comprise frequency dividing circuit in the present embodiment, because we suppose that two cone loudspeakers 254 are identical, thereby has a limited relatively frequency range, and the frequency range of distributed mode speaker should be as far as possible and the frequency range overlaid of traditional cone loudspeaker, to improve the broad sense in space as being narrated in the discussion relevant with above-mentioned test.Yet, the embodiment shown in Figure 28 and 29, its sound tonequality can not be good equally with the sound tonequality of embodiment shown in Figure 26 and 27.Although under the prerequisite of the parts that use appropriate mass, the embodiment among Figure 28 and 29 can realize surpassing the comprehensive tonequality of current many Digital pianos.

In order to obtain further improvement, a kind of modification to circuit among Figure 29 has been shown among Figure 30.Here, the acoustical signal that generator 230,260 produces is sent to a signal modifier unit 265 as digital signal processing unit, and produces a modified signal that is sent to the amplifier 247 that drives cone loudspeaker 254 by the latter.Signal modifier unit 265 can be used to change the timing and the tone color of the acoustical signal of exporting sound generating unit 260.This sound is revised the unit and is comprised a traditional user interface (not illustrating among the figure), and this interface can be by the alter mode of user's selection to the signal of signal generation unit 260 outputs.In this way, the rich of sound can be enhanced to a certain extent, because it is slightly different with the signal quality that drives distributed mode speaker to drive the signal quality of cone loudspeaker.If customer requirements can also and drive between the amplifier 245 of distributed mode speaker in sound generating module 260 and adds an extra signal modifier unit, rich with further raising sound.

Although in front among three embodiment, sound is described as by paired distributed mode speaker and paired conventional loudspeakers and exports, but should know, use single distributed mode speaker and single cone loudspeaker output sound simultaneously, also can obtain similarly mixing at random corresponding to the air agitation pattern of same note.

Although described a kind of infrared motion detection system that utilizes the motion of infrared motion detection technology for detection key among the embodiment in front, also can detect pressing of key with other means, position, pressure and speed when for example, a kind of electromechanical movement detection system can be used to detect key and is touched.

The auxiliary unit that is used for Digital piano

Many people have had Digital piano.Figure 31 has illustrated and has been connected to an auxiliary unit 302 to form a kind of conventional digital piano 300 of implementing piano of the present invention.

As shown in the figure, auxiliary unit 302 comprises a distributed mode speaker 304 that is driven by amplifier 306, this amplifier receives the signal from sound signal generator (this generator as previously mentioned), and this sound generator links to each other with the midi signal output 314 that is equipped with on current Digital piano usually with a plug 312 by a cable 310.

Traditional Digital piano 300 comprises one three tunnel tradition cone loudspeaker system 316, this system comprises a woofer driving by traditional frequency dividing circuit (not illustrating among the figure) 318, a Squawker 320 and a high pitch loudspeaker 322, therefore can be used for producing covering whole audio range promptly from the sound of most frequency ranges of the scope of 20Hz to 20KHz.Distributed mode speaker can be used to produce the sound of most frequency ranges in the frequency range of speaker system 316 as the sound from 100Hz to 20KHz.

Although do not illustrate among Figure 31, traditional Digital piano 300 carries out work by using common record from a sample sound storehouse of the playing piano of high-quality.Sound signal generator 230 also comprises a sample storehouse, and the reason based on the embodiment in Figure 26 and 27 explains preferably wherein comprises the sample of record from the high-quality concert grand piano of different model.

Auxiliary unit 302 can be independent of Digital piano and carry out produce and market, and so, auxiliary unit can be connected on the Digital piano that a buyer had.By simply auxiliary unit 302 being connected to the existing MIDI output of Digital piano, guarantee volume control setting to a particular level of Digital piano simultaneously, make that conventional loudspeakers system 316 also produces sound the sound except distributed mode speaker 304 produces, advantage of the present invention so just can access embodiment.

Variation and modification

As can be seen from the above description, can implement the present invention by the different approach of many kinds.Within the scope of the invention, can carry out many further modifications to all variants of the foregoing description.

For example, the present invention can be used to the sound system of wired broadcast system, theater and movie theatre, vehicle entertainment system, and in the monitoring system of recording and broadcasting chamber.

Except Digital piano, the present invention also can be used to reproduce the sound of or electronic musical instrument such as electric guitar electric from other.

Although used traditional cone loudspeaker among each embodiment that introduces and illustrate in the above, but at least in some specific occasion, also may use other forms of piston type loud speaker, as electrostatic loudspeaker with comprise the flat board that is used to vibrate or film and the piezoelectric speaker that drives by PZT (piezoelectric transducer).Yet, the still preferential in most cases cone loudspeaker that adopts electromagnetic drive type.

Although from the embodiment of all audio reproducing apparatus of Fig. 8 to Figure 24 stereo is being illustrated, any of these embodiment also may be modified as single pass monophony device.Set forth as the front, also can in the monophony device, obtain effect of the present invention.

Discuss the way of introducing a time-delay with respect to the signal that is applied to the piston type loud speaker in being applied to the signal of distributed mode speaker the front.Among any embodiment that this way can be used to introduce with reference to each figure, also can be used among any other embodiment.Be preferably in the occasion of introducing time-delay, the user can regulate this, so that it meets environment of applications of the present invention.

In addition, can also carry out extra similar processing to the signal that is applied to distributed mode speaker and/or piston type loud speaker, as echo, equilibrium or other effects are provided.

Different preferential frequencies scopes and relative output level in introduction, have been provided to more above-mentioned embodiment.Should know that these are example, also have the possible variation of many kinds.Yet the frequency range of the frequency range of distributed mode speaker or loudspeaker cluster and piston type loud speaker or loudspeaker cluster should overlapping this point be crucial.In addition, although in many examples, particularly in having implemented sound reproduction system of the present invention, be configured to more lower slightly than the sound pressure level of cone loudspeaker by sound pressure level with distributed mode speaker, as has only several decibels difference, can obtain optimum efficiency, when the sonorific sound pressure level of distributed mode speaker more than cone loudspeaker produce low the time, still can obtain the improvement on the sound effect, certainly, to such an extent as to this moment distributed mode speaker sound pressure level can not can not be discovered by the too low sound that produces.In test, its sound still can be discovered when the sound pressure level of distributed mode speaker is lower than more than the sound pressure level-35dB of cone loudspeaker, but on this level obtained sound effect to improve be inappreciable.

In some specific occasions, the sound pressure level that distributed mode speaker produces is higher than the sound pressure level that the piston type loud speaker produces may be even more ideal.

Claims

1. sonorific process, comprise that the signal of telecommunication by the sound that will reproduce with a kind of representative drives distributed mode speaker and piston type loud speaker simultaneously, and the operating frequency range of distributed mode speaker and piston type speaker unit is at least in the part of audio range.

2. process as claimed in claim 1 is characterized in that, described distributed mode speaker and piston type speaker operation are in essentially identical frequency range.

3. process as claimed in claim 1 is characterized in that, described distributed mode speaker is operated in the frequency range narrower than piston type loud speaker.

4. process as claimed in claim 3 is characterized in that, the frequency range of described distributed mode speaker is all in the frequency range of piston type loud speaker.

5. process as claimed in claim 1 is characterized in that described distributed mode speaker is at least functioning in the frequency range of 100Hz to 1000Hz.

6. process as claimed in claim 1 is characterized in that described distributed mode speaker is at least functioning in the frequency range of 200Hz to 2000Hz.

7. process as claimed in claim 1 is characterized in that described distributed mode speaker is operated in the frequency range that the upper limit is not less than 6000Hz.

8. sonorific process as claimed in claim 1, it is characterized in that, described distributed mode speaker is operated in first frequency scope and the second frequency scope of being separated by the idle frequency band of this distributed mode speaker, but at least a portion frequency range overlaid of one of them frequency range and described piston type loud speaker.

9. as the described process of each claim of front, it is characterized in that the sound pressure level that described distributed mode speaker device produces is lower than the sound pressure level that is produced by described piston type speaker unit.

10. process as claimed in claim 9 is characterized in that, the sound pressure level that described distributed mode speaker device produces is hanged down 5 ± 3 decibels than the sound pressure level that described piston type speaker unit produces.

11., it is characterized in that the sound delay that the acoustic phase that described distributed mode speaker device produces produces for described piston type speaker unit as the described process of each claim of front.

12. process as claimed in claim 11, described time-delay is no more than 80ms.

13. process as claimed in claim 12, described time-delay is no more than 35ms.

14., it is characterized in that described distributed mode speaker designs based on the mathematical computations of choosing design parameters value utilization to the distributed mode speaker characteristic as the described process of each claim of front.

15., it is characterized in that described sound is reproduced by recording or broadcast singal as the described process of each claim of front.

16., it is characterized in that described process is carried out at the single passage that is used for producing monophonic sounds as the described process of each claim of front.

17., it is characterized in that described process is carried out simultaneously being used for producing stereosonic two passages as each described process in the claim 1 to 15.

18., it is characterized in that described process is carried out simultaneously as each described process in the claim 1 to 15 in each passage of an ambiophonic system.

19., it is characterized in that described process is carried out in vehicle or ship as each described process in the claim 1 to 18.

20., it is characterized in that described process is carried out in home environment as each described process in the claim 1 to 18.

21. one kind comprises piston type loud speaker, distributed mode speaker and drives the speaker combination of the circuit arrangement of described loud speaker by the signal of telecommunication that representative will be reproduced sound, this combining and configuring become to make described speaker operation with the equitant frequency range of at least a portion of audio range.

22. combination as claimed in claim 21 is characterized in that, described distributed mode speaker and piston type speaker operation are in essentially identical frequency range.

23. combination as claimed in claim 21 is characterized in that, described distributed mode speaker is operated in than the narrow frequency range of described piston type loud speaker.

24. combination as claimed in claim 23 is characterized in that, the frequency range of described distributed mode speaker is fully in the frequency range of described piston type loud speaker.

25. combination as claimed in claim 21 is characterized in that, described distributed mode speaker is at least functioning in the frequency range of 100Hz to 1000Hz.

26. combination as claimed in claim 21 is characterized in that, described distributed mode speaker is at least functioning in the frequency range of 200Hz to 2000Hz.

27. combination as claimed in claim 21 is characterized in that, described distributed mode speaker is operated in the frequency range that the upper limit is not less than 6000Hz.

28. combination as claimed in claim 21, it is characterized in that, described distributed mode speaker is operated in first frequency scope and the second frequency scope that is separated by the idle frequency band of this distributed mode speaker, and at least a portion of one of them frequency range and described piston type loudspeaker frequency ranges is overlapping.

29., it is characterized in that described distributed mode speaker device is used for producing the low sound pressure level of sound pressure level that produces than described piston type loud speaker as each described combination in the claim 21 to 28.

30. combination as claimed in claim 29 is characterized in that, described distributed mode speaker device is used for producing the sound pressure level that produces than described piston type speaker unit and hangs down 5 ± 3 decibels sound pressure level.

31. as the described combination of each claim of front, it is characterized in that, comprise the device of the sound delay that produces for described piston type loud speaker in order to acoustic phase that described distributed mode speaker device is produced.

32. combination as claimed in claim 11 is characterized in that, described time-delay is no more than 80 milliseconds.

33. combination as claimed in claim 12 is characterized in that, described time-delay is no more than 35 milliseconds.

34. a monophonic sound sound reproduction system, comprise at least one signal source, amplifier installation and by amplifier installation drive as each described speaker combination in the claim 21 to 33.

35. a stereophonics device comprises the stereo amplifier of first and second passages of first and second speaker combination as described in being connected to comprising of loud speaker as described in being used to drive as each described first and second speaker combination in the claim 21 to 33 and.

36. a Digital piano comprises the shake-up of keyboard, pedal and response keyboard and pedal and produces the device of the signal of telecommunication of representing piano voice, and by the described signal of telecommunication drive as each described speaker combination in the claim 21 to 33.

37. an electrophone is used for producing the signal of telecommunication of the musical sound that representative will reproduce, and by the described signal of telecommunication drive as each described speaker combination in the claim 21 to 33.

38. servicing unit, comprising: a distributed mode speaker device, and comprise the high impedance input unit and amplify from the signal of this high impedance input unit and drive the circuit of described distributed mode speaker device, described servicing unit be fit to comprise an amplifier and a piston type loud speaker be used to realize that the sound reproduction system of process links to each other according to claim 1.

39. device as claimed in claim 38 is characterized in that, described circuit comprises at least one volume controller.

40. as claim 38 or 39 described devices, it is characterized in that, comprise the first and second distributed mode speaker devices, described circuit comprises first and second passages that make described servicing unit can link the stereophonics system, and this stereophonics system comprises a stereo amplifier and at least the first and second piston type loud speakers, to carry out process as claimed in claim 1.

41. transform the existing process that comprises the sound reproduction system of signal source, amplifier and at least one piston type speaker unit for one, comprise a distributed mode speaker device is connected to described system, this system is suitable for carrying out instead as each described process in the claim 1 to 20.

42. a transformation is provided with the process of the Digital piano of piston type speaker unit, comprises a distributed mode speaker device is connected to this Digital piano, is suitable for carrying out as each described process in the claim 1 to 20 so that this Digital piano is transformed into.

43. a transformation is provided with the process of the electrophone of piston type speaker unit, comprises a distributed mode speaker device is connected to this electrophone, is suitable for carrying out as each described process in the claim 1 to 20 so that this musical instrument is transformed into.

44. audio reproducing apparatus in machine comprises at least one signal source, at least one is as each described speaker combination in the claim 21 to 33 and amplify from the signal of signal source and drive the device of speaker combination with the signal after amplifying.

45. an amplifier that amplifies the signal of representative voice comprises left lane device and right lane device, each described lane device comprises the first passage that drives distributed mode speaker and the second channel of driven plunger formula loud speaker.

46. circuit, comprise a left side that is connected to a stereophonic signal generation device, the left side of right output, right input, and be connected to this left side, right input, in order to cushion first and second buffer amplifiers that are loaded signal respectively, each described buffer amplifier is connected to corresponding a pair of next stage amplifier with its output, and this pair amplifier can provide respectively in order to the first and second left passage output signals that drive a left distributed mode speaker and a left piston formula loud speaker and in order to drive the first and second right passage output signals of a right distributed mode speaker and a right piston type loud speaker.

47. circuit as claimed in claim 46 is characterized in that, comprises the device in order to the relative level that the output signal that is provided by each pair amplifier is provided.

48. be connected to the servicing unit of a Digital piano, comprising: the input unit that receives the signal that representative keyboard and pedal from this Digital piano touch; Comprise the numeral sample storehouse of Digital piano and from described sample storehouse, choose the acoustical signal generating means of the device of signal according to input signal; Amplify the amplifier that is selected from the signal in the described storehouse; And the suitable distributed mode speaker device that drives by the signal of this amplifier generation.

49. in the listening space that limits by the border, enhancing is by the process of the broad sense in space of the sound that at least one loud speaker produced of representing the signal driving that will reproduce sound, described process comprises that driving at least the another one loud speaker by described signal produces one and merge sound field, in this sound field, the value of at least one parameter is different with the value of this parameter in the sound field that is produced separately by described at least one loud speaker, and the difference on this numerical value can make the broad sense in space be improved.

50. process as claimed in claim 49 is characterized in that, described parameter is laterally early stage energy mark, the described increase that is not both on its numerical value.

51. process as claimed in claim 49 is characterized in that, described parameter is the binaural cross-correlation coefficient, the described increase that is not both on its numerical value.

52. in the listening space that limits by the border, enhancing is by the process of the broad sense in space of the sound that at least one loud speaker produced of representing the signal driving that will reproduce sound, described process comprises that driving at least the another one loud speaker by described signal produces one and merge sound field, in this sound field, the value of its laterally early stage energy mark increases to some extent with respect to the value of this parameter in the sound field that is produced separately by described at least one loud speaker, and its binaural cross-correlation coefficient reduces to some extent with respect to the value by this parameter in the independent sound field that produces of described at least one loud speaker.

53. in being provided with keyboard, pedal and response produce the described shake-up of representative to the shake-up of keyboard and pedal a kind of Digital piano of control-signals generator of control signal, its improvement comprises:

A kind ofly respond described control signal and produce the drive signal generator of first and second drive signals of representing the sound that first and second pianos that described shake-up and each self simulation differ from one another produce separately;

Come soniferous at least one first loud speaker by described first drive and by producing first kind air agitation pattern; And

Drive simultaneously and air agitation pattern by producing second type is come soniferous at least one second loud speaker by described second drive signal and described first loud speaker.

54. improvement as claimed in claim 53 is characterized in that, described at least one first loud speaker is a kind of distributed mode speaker, and described at least one second loud speaker comprises a kind of soniferous piston type moving meter that is used for.

55. improvement as claimed in claim 53 is characterized in that, described at least one first loud speaker is a kind of distributed mode speaker, and described at least one second loud speaker is a kind of cone loudspeaker.

56. in being provided with keyboard, pedal and response produce the described shake-up of representative to the shake-up of keyboard and pedal a kind of Digital piano of control-signals generator of control signal, its improvement comprises:

A first sample storehouse that comprises representative from the numeral sample of first type grand piano sound;

A kind ofly respond described control signal and produce a kind of first drive circuit of representing first drive signal of described shake-up, and this signal source is from the numeral sample in the described first sample storehouse;

A second sample storehouse that comprises representative from the numeral sample of second type grand piano sound;

A kind ofly respond described control signal and produce a kind of second drive circuit of representing second drive signal of described shake-up, and this signal source is from the numeral sample in the described second sample storehouse, and described first and second drive circuits produce first and second drive signals separately simultaneously;

The distributed mode speaker that at least one drives by described first drive signal; And

The cone loudspeaker that at least one drives by described second drive signal.

57. in being provided with keyboard, pedal and response produce the described shake-up of representative to the shake-up of keyboard and pedal a kind of Digital piano of control-signals generator of control signal, its improvement comprises:

A sample storehouse that comprises representative from a kind of numeral sample of grand piano sound;

A kind ofly respond described control signal and produce a kind of drive signal of representing described shake-up

Drive circuit, this signal source is from the numeral sample in described sample storehouse;

At least one is by the distributed mode speaker of described drive; And

The cone loudspeaker that at least one is driven simultaneously by described drive signal and described at least one distributed mode speaker.

58. in being provided with keyboard, pedal and response produce the described shake-up of representative to the shake-up of keyboard and pedal a kind of Digital piano of control-signals generator of control signal, its improvement comprises:

Respond described control signal and produce and a kind ofly represent described shake-up and be derived from first drive signal of described numeral sample and produce a kind of a kind of drive circuit of representing described shake-up and being derived from second drive signal of described numeral sample, described second drive signal has at least a parameter to do modification with respect to described first drive signal;

The distributed mode speaker that at least one is driven by one of described drive signal;

The cone loudspeaker that at least one is driven simultaneously by another signal in the described drive signal and described at least one distributed mode speaker.

59. in being provided with keyboard, pedal and response produce the described shake-up of representative to the shake-up of keyboard and pedal a kind of Digital piano of control-signals generator of control signal, comprise the numeral sample of representative at least one sample storehouse from the sound of at least a grand piano, and a kind of drive circuit responds described control signal and produces a kind of drive signal of representing described shake-up and being derived from the numeral sample in described at least one sample storehouse, and its improvement comprises:

At least one is by described drive and can come soniferous first loud speaker by the air agitation pattern that produces a kind of first kind;

At least one is driven simultaneously by described drive signal and described first loud speaker and can come soniferous second loud speaker by the air agitation pattern that produces a kind of second type.

60. an electronic musical instrument, comprising:

A keyboard of forming by the key of corresponding each note;

One is connected to keyboard and response produce the corresponding driving signal to the shake-up of keyboard signal generator;

One is connected to the drive signal of signal generator and response signal generator and produces the first audio reproduction unit of the sound corresponding with note, and the described first audio reproduction unit is caused in panel loudspeaker that by a panel type loud speaker and at least one response acoustical signal the transducer of resonance forms; And

One be connected to signal generator and with the described first audio reproduction unit side by side the response signal generator drive signal and produce the second sound reproduction units with the corresponding sound of note; The described second sound reproduction units comprises at least one cone loudspeaker.

61. electronic musical instrument as claimed in claim 60, it is characterized in that, the described first and second audio reproduction unit are used for receiving the same signal from described signal generator, the reception of the described first and second audio reproduction cell response drive signals and produce sound.

62. electronic musical instrument as claimed in claim 60, it is characterized in that, the described first audio reproduction unit is used for producing the sound in first audio frequency range, the described second sound reproduction units is used for producing the sound in second audio frequency range, and described first and second audio frequency ranges have sizable part overlaid.

63. electronic musical instrument as claimed in claim 62, it is characterized in that, the response of described signal generator produces representative by first drive signal of the sound that the corresponding shake-up of described first fingerboard is produced and produce second drive signal of representative by the sound that the corresponding shake-up of described second fingerboard is produced to the shake-up of keyboard, the described first audio reproduction cell response and producing and the corresponding sound of described first drive signal, described second sound reproduction units response and producing and the corresponding sound of described second drive signal.

64. electronic musical instrument as claimed in claim 60, it is characterized in that, described signal generator is connected to one of described first and second audio reproduction unit by a kind of signal modifier, described signal modifier is used for revising at least one parameter in the parameters such as timing, tone color, reverberation and volume of the drive signal that is produced by signal generator and produces a kind of modified signal, and one of described first and second audio reproduction unit described modified signal of response and produce the sound corresponding with note.

65. electronic musical instrument as claimed in claim 60 is characterized in that, the described first audio reproduction unit comprises one or more distributed mode speakers.

66. electronic musical instrument as claimed in claim 60 is characterized in that, the described second sound reproduction units comprises:

A plurality of cone loudspeakers, each described cone loudspeaker are used for exporting the sound that is in the assigned frequency scope;

One receives drive signal and will be in the frequency dividing circuit that drive signal in the assigned frequency scope is delivered to the loud speaker of choosing from described a plurality of cone loudspeakers from described signal generator.

67. electronic musical instrument as claimed in claim 60 is characterized in that, the described first and second audio reproduction unit comprise that respectively one is used for balance and has the equalizer of output of the described audio reproduction unit of different frequency sound.

68. certain keyboard instrument sound method of simulation comprises following steps:

A keyboard of being made up of the key corresponding with note is set;

A response is set to the shake-up of keyboard and produce the signal generator of respective drive signal;

Touch control keyboard produces the corresponding driving signal;

Utilize the drive signal of described generation to drive first an audio reproduction unit that comprises plane resonator and a described acoustical signal of response and in resonator, cause the transducer of resonance simultaneously, and second a sound reproduction units that comprises cone loudspeaker.

69. as the described method of claim 68, it is characterized in that, utilize same drive signal to drive the first and second audio reproduction unit and produce sound.

70., it is characterized in that the described first and second audio reproduction unit are driven and produce the sound with first and second audio frequency ranges as the described method of claim 69, described first and second audio frequency ranges have quite most of overlaid.

71. as the described method of claim 69, it is characterized in that, the generation of described drive signal comprises first and second drive signals of first and second piano voices that the generation expression is produced by the corresponding shake-up of described fingerboard, and first drive signal wherein and the second sound drive signal are utilized and the generation voice output by the described first audio reproduction unit and the second sound reproduction units respectively.

72. as the described method of claim 68, it is characterized in that, described utilization for the acoustical signal that produces comprises: revise at least one parameter in the parameters such as timing, reverberation and volume of the signal that produces and utilize modified signal to drive a unit in the described first and second audio reproduction unit, and utilize the signal of unmodified to drive another unit in the described first and second audio reproduction unit.

73., it is characterized in that the described first audio reproduction unit comprises one or more NXT loud speakers as the described method of claim 68.

74. as the described method of claim 68, it is characterized in that, the described second sound reproduction units comprises a plurality of cone loudspeakers and a frequency dividing circuit that selectively drive signal of different frequency is added to the loud speaker of choosing from more described loud speakers, described method comprises uses the signal of choosing from the acoustical signal of described different frequency to drive described a plurality of loud speaker, and drives described at least one transducer simultaneously with the signal that has with the corresponding frequency of signal that is used to drive described a plurality of loud speakers simultaneously.

75. as the described method of claim 74, it is characterized in that, described method comprises that also balance is used to drive the acoustical signal of the described first and second audio reproduction unit, so that the frequency response of the described first and second audio reproduction unit remains unchanged in the frequency output area of described audio reproduction unit substantially.