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EP0642292A2 - Dispositif pour la reproduction stéréophonique - Google Patents

Dispositif pour la reproduction stéréophonique Download PDF

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Publication number
EP0642292A2
EP0642292A2 EP94106301A EP94106301A EP0642292A2 EP 0642292 A2 EP0642292 A2 EP 0642292A2 EP 94106301 A EP94106301 A EP 94106301A EP 94106301 A EP94106301 A EP 94106301A EP 0642292 A2 EP0642292 A2 EP 0642292A2
Authority
EP
European Patent Office
Prior art keywords
loudspeakers
delay
sound propagation
individual
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94106301A
Other languages
German (de)
English (en)
Other versions
EP0642292A3 (fr
EP0642292B1 (fr
Inventor
Jörg Höllermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Publication of EP0642292A2 publication Critical patent/EP0642292A2/fr
Publication of EP0642292A3 publication Critical patent/EP0642292A3/fr
Application granted granted Critical
Publication of EP0642292B1 publication Critical patent/EP0642292B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/301—Automatic calibration of stereophonic sound system, e.g. with test microphone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/307—Frequency adjustment, e.g. tone control

Definitions

  • the invention relates to a device according to the preamble of the main claim.
  • the human ear receives its directional information from the evaluation of level and transit time differences between the acoustic signals received by the right and left ear.
  • the directional information corresponds to the stereo recording.
  • the listener is at a location that is asymmetrical to a two or more loudspeaker system, the sound impression is spatially strongly shifted to the next loudspeaker.
  • Car radios with runtime compensation are already known, but they require manual measurement and subsequent input of the distances between the listening location and the loudspeakers.
  • the object of the present invention is to facilitate the setting of the delay times in a device according to the type of the main claim.
  • this object is achieved in that audio signals provided for playback with the aid of the individual loudspeakers pass through delay devices whose delay time is adjustable, that means for measuring the sound propagation times from the individual loudspeakers to the listening location are provided, and in that the delay times are so automatic can be set so that the sum of the sound propagation time and the respectively set delay time is the same for all speakers.
  • the device according to the invention also has the advantage that the actual sound propagation time is taken into account while the manual measurement for an assumed path of the sound is carried out between the loudspeaker in question and the listening location. In the latter case, for example, reflection or deflection of the sound waves is not taken into account.
  • Level differences at the listening location are taken into account according to a further development of the device according to the invention in that means are also provided for measuring the sound level caused by the reproduction of a measurement signal, preferably a noise signal, by the individual loudspeakers at the listening location and that the volume of the individual Loudspeaker can be preset automatically in order to compensate for level differences.
  • a measurement signal preferably a noise signal
  • the set delay times and, if appropriate, the stored presets of the volume can be stored in a non-volatile manner for several listening locations. It is preferably provided that information about which of the stored delay times and, if applicable, the stored presets of the volume are supplied to the delay devices each time the device is switched on, can also be stored in a non-volatile manner.
  • a car radio can be programmed with the device according to the invention after measuring the sound propagation times for the individual seating positions in such a way that the playback can be optimized by pressing a button on the individual seating positions and that when the device is switched on, the delay times assigned to a predetermined seating position can be set. This will generally be the driver's seating position.
  • Modern receiving devices in particular car radios, often include digital signal processing. It is advantageous here if it is provided according to an embodiment of the invention that the delay devices are formed by digital memories from which the audio signals to be delayed are read out with a time delay compared to the writing.
  • An adaptation of the device according to the invention to the respective arrangement of the loudspeakers and the listening location is advantageously possible in that a pulse signal is supplied to each loudspeaker in succession for measuring the sound propagation time, a timer being simultaneously measured which measures the time until on a measuring microphone the sound level exceeds a predetermined threshold.
  • the pulse signal is fed to the loudspeaker via a low-pass filter, preferably a third-order filter with a cut-off frequency of 11 kHz.
  • the pulse signal itself is implemented, for example, by a rectangular pulse of approximately 3 ms duration.
  • the audio signals also go through frequency response equalizer circuits, that means for measuring the frequency response are provided between the loudspeakers and a measuring microphone and that the frequency response equalizers are adjustable according to the results of the measurement, the respective set frequency responses of the individual speakers for different Listening locations can be saved.
  • the block diagram according to FIG. 1 represents the LF part of, for example, a car radio with inputs 1, 2, 3 for a receiving part, a cassette player and a CD player.
  • Signals of a microphone amplifier 5 are fed to a further input 4, which is designed only for one of the stereo signals, for example the right signal R.
  • the input switch 6 is in the position 4, so that the signals of the microphone amplifier 5 are passed on.
  • signals from one of the inputs 1, 2 or 3 are fed to a stereo analog / digital converter 7 via the input switch 6.
  • a control device 8 Of the Input changeover switch 6 and further changeover switches described later can be controlled by a control device 8.
  • the outputs of the analog / digital converter 7 are connected to inputs of a two-way switch 9, which can also be controlled by the control device 8.
  • the digitized audio signals L and R reach two controllable delay devices 10, 11; 12, 13.
  • RAM read-write memory
  • the memory is accessed via the internal address and data management of the digital signal processor.
  • the sequence, switchover and level control can be carried out by the digital signal processor itself or by an external microcontroller.
  • the output signals of the controllable delay devices are provided for the left front loudspeaker, for the left rear loudspeaker, for the right front loudspeaker and for the right rear loudspeaker and are therefore designated with LF, LR, RF and RR. These signals are fed to inputs of a four-way switch 14 and, in the upper position of the four-way switch, are passed on to two stereo digital / analog converters 15, 16.
  • the output signals LF ', LR', RF 'and RR' of the digital / analog converter 15, 16 arrive via controllable volume controls 17, 18, 19, 20 and power amplifiers 21, 22, 23, 24 as signals LF '', LR '',RF''andRR''to the loudspeakers 25, 26, 27, 28.
  • a measuring microphone 29 can be brought to the different listening locations, in different positions in a motor vehicle, and is connected to the input of the microphone amplifier 5 connected.
  • An operating and possibly display unit 30 is connected to the control device 8, with which, in addition to the usual operating functions, the measurement of the transit times and the sound level can be initiated by a corresponding key input.
  • the double changeover switch 9 is controlled into the lower position.
  • the individual switches of the four-way switch 14 can be controlled independently of one another during the “measuring” operating mode in such a way that one of the switches one after the other assumes the middle position (connection to test signal pulse or noise) and the other switches assume the lower position, in which the respective Speakers received no signals.
  • the measuring signal MESS arriving via the signal chain 29, 5, 4, 6, 7, 9 is then fed to a level meter 31 and then to a threshold discriminator 32. Its output is connected to a transit time meter 33, which essentially consists of a counter, which is started by the control device together with a pulse generator 34 and is stopped by the output signal of the threshold discriminator 32.
  • the output of the pulse generator is connected via a low-pass filter 35 to a first input of a changeover switch 36.
  • a noise generator 37 which can also be controlled by the control device 8, is connected to the second input of the changeover switch 36.
  • FIG. 2 shows the flow chart of a program for the control device 8 (FIG. 1) during the "measuring" operating mode and in abbreviated form during the "playback" operating mode.
  • the usual functions such as manual control of the volume controls 17 to 20 and the selection between inputs 1, 2 or 3, are possible.
  • the two-way switch 9 and the four-way switch 14 are in the upper position o.
  • the program part 41 which effects these functions, is run through cyclically, with a query being carried out before each repetition as to whether an acoustic measurement should take place. If this has been entered with the aid of the operating device 30, the operating mode "measure" is activated after branching 42.
  • the volume controls 17 to 20 (FIG. 1) are set to a defined standard value (average volume). In this part of the program it is also waited for the operator to bring the measuring microphone 29 (FIG. 1) to the first listening location to be measured.
  • the four-way switch 14 is brought to the middle position m for the respective channel to be measured and to the lower position u for the other channels, in which the connected loudspeakers are muted.
  • the switch 36 is set to the left position 1, while the pulse generator 34 and the time meter 33 are started. As soon as the sound level at the measuring microphone exceeds a certain threshold value, the transit time meter 33 is stopped at 46 and the measured value is stored in the control device 8 (FIG. 1).
  • the changeover switch 36 is brought into the right position r in the program part 47 and the noise generator is put into operation for a time of about 500 ms.
  • the average noise level at the microphone is determined at 48 over part of the time window, for example over 200 ms. This value is also saved.
  • the program branches depending on whether all four channels have been measured. If this is not yet the case, the program parts 44 to 49 are repeated for the next channel. However, if all four channels have been measured, the measured values T LF , T RF , T LR , T RR (T x ) for the runtimes of the four channels and the measured values L LF , L RF , L LR , L RR (L x ) before.
  • Ta is the delay time to be set in sampling cycles of the digital audio signal processing device
  • x the respective loudspeaker (LF, RF, LR, RR)
  • k is the ratio between the processor cycle duration in which the sound propagation times T x were measured and the sampling cycle duration designated.
  • the maximum sound propagation time T max (in processor cycles) was previously determined from the measured sound propagation times.
  • the delay devices 10 to 13 are set to the calculated values and the four values are stored together with an indication of the associated listening location in a non-volatile memory of the control device.
  • a branch 52 takes place depending on whether further listening locations are to be measured. If this is not the case, the volume controls are set at 53 to the values existing before activation of the "measuring" operating mode plus the offset determined in program part 51. At 53, the input 1, 2 or 3 that was active before the calibration is set again. In addition, the other switches are switched according to the "playback" mode. The program then continues at 41. If, however, further listening locations are to be measured, which is done by an appropriate input, the program is repeated after branching 52 at 43.
  • FIG. 3 schematically shows a car 60 with a driver 61 and four loudspeakers 25, 26, 27, 28.
  • the distances a, b, c and d from the driver's head to the individual loudspeakers are of different sizes. As a result, the above-mentioned adverse effects occur.
  • the distance to all loudspeakers which is effective for the psycho-acoustic listening impression, is made the same size by the delay time compensation with the aid of controllable delay devices 10 to 13 (FIG. 1).
  • the loudspeaker 28 which is furthest away from the driver 61 maintains its distance d.
  • the other loudspeakers also have a spacing of d due to the delay time equalization and are apparently in positions 25 ', 26' and 27 ', which lie on a circle around driver 61.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic Arrangements (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP94106301A 1993-08-13 1994-04-22 Dispositif pour la reproduction stéréophonique Expired - Lifetime EP0642292B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4327200 1993-08-13
DE4327200A DE4327200A1 (de) 1993-08-13 1993-08-13 Einrichtung zur stereophonen Wiedergabe

Publications (3)

Publication Number Publication Date
EP0642292A2 true EP0642292A2 (fr) 1995-03-08
EP0642292A3 EP0642292A3 (fr) 1995-10-25
EP0642292B1 EP0642292B1 (fr) 2001-07-18

Family

ID=6495097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94106301A Expired - Lifetime EP0642292B1 (fr) 1993-08-13 1994-04-22 Dispositif pour la reproduction stéréophonique

Country Status (5)

Country Link
EP (1) EP0642292B1 (fr)
JP (1) JP3677059B2 (fr)
DE (2) DE4327200A1 (fr)
ES (1) ES2160603T3 (fr)
PT (1) PT642292E (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19580412C1 (de) * 1994-04-30 1998-10-22 Deutsch Zentr Luft & Raumfahrt Verfahren und Vorrichtung zur Kompensation akustischer Verfälschungen infolge der Raumakustik bei der Tonwiedergabe durch elektro-akustische Wiedergabegeräte
EP1253806A2 (fr) * 2001-04-27 2002-10-30 Pioneer Corporation Dispositif automatique de correction de champ sonore
EP1056310A3 (fr) * 1999-05-27 2002-12-11 Fujitsu Ten Limited Systeme audio pour automobile
EP1545156A2 (fr) * 2003-11-19 2005-06-22 Pioneer Corporation Dispositif de mesure du temps de retard dans une espace sonore et une programme informatique associé

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004212876A (ja) * 2003-01-08 2004-07-29 Pioneer Electronic Corp オーディオ装置
DE10354492A1 (de) * 2003-11-21 2005-06-09 Volkswagen Ag Einstelleinrichtung für eine Lautsprecheranlage in einem Fahrzeug sowie entsprechendes Einstellverfahren
JP2005341384A (ja) 2004-05-28 2005-12-08 Sony Corp 音場補正装置、音場補正方法
JP4347153B2 (ja) * 2004-07-16 2009-10-21 三菱電機株式会社 音響特性調整装置
DE102005008369A1 (de) * 2005-02-23 2006-09-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zum Simulieren eines Wellenfeldsynthese-Systems
JP4507951B2 (ja) * 2005-03-31 2010-07-21 ヤマハ株式会社 オーディオ装置
JP4928967B2 (ja) * 2007-02-02 2012-05-09 パイオニア株式会社 音響装置、その方法、そのプログラム及びその記録媒体
JP4518142B2 (ja) * 2007-12-25 2010-08-04 ソニー株式会社 音場補正装置、音場補正方法
JPWO2009107202A1 (ja) * 2008-02-26 2011-06-30 パイオニア株式会社 音響信号処理装置及び音響信号処理方法
JPWO2009107227A1 (ja) * 2008-02-29 2011-06-30 パイオニア株式会社 音響信号処理装置及び音響信号処理方法
CN102113351B (zh) * 2008-07-28 2013-07-31 皇家飞利浦电子股份有限公司 音频系统及其操作的方法
JP5304923B1 (ja) * 2012-05-10 2013-10-02 オンキヨー株式会社 音声処理装置
DE102017209654A1 (de) * 2017-06-08 2018-12-13 Continental Automotive Gmbh Schallausgabevorrichtung, Kraftfahrzeug und Verfahren zum Betreiben einer Schallausgabevorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504562A1 (fr) 1991-02-20 1992-09-23 Nokia (Deutschland) GmbH Système de reproduction du son pour reproduction du son avec effet spatial du son

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5645360B2 (fr) * 1973-12-27 1981-10-26
DE3415646A1 (de) * 1984-04-27 1985-10-31 Standard Elektrik Lorenz Ag Fernbedienbare anordnung zur einstellung der balance im tonuebertragungsteil einer anordnung zur wiedergabe eines stereophonen tonereignisses
US5109415A (en) * 1988-08-30 1992-04-28 Nec Corporation Audio signal processing system performing balance control in both amplitude and phase of audio signal
JP2708105B2 (ja) * 1989-04-26 1998-02-04 富士通テン 株式会社 車載用音響再生装置
DE4125893A1 (de) * 1990-08-03 1992-03-12 Koenig Florian Aufbereitung der wiedergabeakustik in kraftfahrzeuginnenraeumen
KR930011742B1 (ko) * 1991-07-23 1993-12-18 삼성전자 주식회사 청취공간 상태에 따른 재생 음성신호의 주파수 특성 보정장치
DE4302725A1 (en) * 1993-02-01 1993-06-24 Michael Wannke Balance regulation circuit for multichannel audio amplifier - adjusts ratio between loudspeaker volumes in dependence on relative position of listener to each loudspeaker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504562A1 (fr) 1991-02-20 1992-09-23 Nokia (Deutschland) GmbH Système de reproduction du son pour reproduction du son avec effet spatial du son

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19580412C1 (de) * 1994-04-30 1998-10-22 Deutsch Zentr Luft & Raumfahrt Verfahren und Vorrichtung zur Kompensation akustischer Verfälschungen infolge der Raumakustik bei der Tonwiedergabe durch elektro-akustische Wiedergabegeräte
EP1056310A3 (fr) * 1999-05-27 2002-12-11 Fujitsu Ten Limited Systeme audio pour automobile
US7218740B1 (en) 1999-05-27 2007-05-15 Fujitsu Ten Limited Audio system
EP1253806A2 (fr) * 2001-04-27 2002-10-30 Pioneer Corporation Dispositif automatique de correction de champ sonore
EP1253806A3 (fr) * 2001-04-27 2008-11-12 Pioneer Corporation Dispositif automatique de correction de champ sonore
EP1545156A2 (fr) * 2003-11-19 2005-06-22 Pioneer Corporation Dispositif de mesure du temps de retard dans une espace sonore et une programme informatique associé
EP1545156A3 (fr) * 2003-11-19 2007-04-18 Pioneer Corporation Dispositif de mesure du temps de retard dans une espace sonore et une programme informatique associé
US7477750B2 (en) 2003-11-19 2009-01-13 Pioneer Corporation Signal delay time measurement device and computer program therefor

Also Published As

Publication number Publication date
EP0642292A3 (fr) 1995-10-25
DE4327200A1 (de) 1995-02-23
ES2160603T3 (es) 2001-11-16
JPH0787598A (ja) 1995-03-31
JP3677059B2 (ja) 2005-07-27
PT642292E (pt) 2002-01-30
DE59409802D1 (de) 2001-08-23
EP0642292B1 (fr) 2001-07-18

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