CN101163350A - Earphone - Google Patents
Earphone Download PDFInfo
- Publication number
- CN101163350A CN101163350A CNA2007101524038A CN200710152403A CN101163350A CN 101163350 A CN101163350 A CN 101163350A CN A2007101524038 A CNA2007101524038 A CN A2007101524038A CN 200710152403 A CN200710152403 A CN 200710152403A CN 101163350 A CN101163350 A CN 101163350A
- Authority
- CN
- China
- Prior art keywords
- signal
- noise
- sound
- sound coil
- earphone
- 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.)
- Pending
Links
Images
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
An earphone includes a loudspeaker component having two sound coils with a vibrating piece and a drive vibrating piece for inputting musical sound signal to one coil, and inputting noise elimination signal of noise signal detected by a microphone based on noise detection. Also can be a sound coil with a center tap for inputting musical sound signal through one end of sound coil and noise elimination signal through another end of sound coil. Therefore, the electric coupling relation of noise elimination signal and musical sound signal is reduced, and the influence of noise elimination signal to musical sound signal is reduced, both the power amplification circuit of noise elimination signal and musical sound signal can not be load for each other, and the earphone of noise elimination mode which can listen reproduction sound based on musical sound signal with excellent quality is obtained even if the embedded battery is expended.
Description
Technical field
The present invention relates to reduce the earphone of external noise.
Background technology
Be accompanied by popularizing of portable music player, earphone is also extensively popularized.Portable music player usually noise level high in the street, use in the vehicles such as train, bus, with the music of being reproduced by player, external noise also can be heard by earphone.If listen to the music in noise, musical sound is flooded by noise sometimes, listens to the music so the user will improve volume, and volume too improves, and sound leaks into the outside from earphone, and the people around allowing sometimes feel bad.In addition, promptly use the musical sound of headphone reproduction high tone quality, the noise that enters from the outside is bothered sometimes, and the quality of the reproduction sound that the user can hear is descended.
Therefore, eliminate the noise that enters from the outside, can only hear that in user's ear the noise removing earphone of musical sound is popularized.The principle of noise removing earphone is to detect the noise that enters earphone with microphone, and the elimination noise signal of generation and detected noise signal opposite phase is eliminated noise with the elimination noise signal.General noise removing formula earphone has a loud speaker, therefore, has a sound coil.Pass through filter or delay circuit again with the noise signal that is transformed to the signal of telecommunication behind the microphone collection sound, generate noise-cancelling signal with the noise signal opposite phase, this noise-cancelling signal and note signal are synthesized (addition) afterwards, carry out power amplification, be input to a sound coil of a described loud speaker.
From the sound of loud speaker output is sound after composite signal with noise-cancelling signal and note signal is transformed to sound.The sound of noise-cancelling signal after by the loud speaker conversion is eliminated the external noise that enters earphone, and the sound that enters user's ear becomes the sound that has only after the note signal conversion.
Perhaps, also have after noise-cancelling signal and note signal are carried out power amplification separately, before the described sound coil of next-door neighbour, the method for composite noise erasure signal and note signal., two power amplifiers are connected with the sound coil serial or parallel connection, so exist a power amplifier to become the problem of the load of another power amplifier.
Fig. 4 represents the example of noise removing formula earphone in the past.In Fig. 4, at the openend of the earphone outer covering 1 of the cartridge type that the end is arranged in conjunction with flange member 2, the fixing headrest 3 on the face in the outside of flange member 2 (in Fig. 4, the left side).When the user uses this earphone, the outer face of the headrest 3 contact user's head side, user's ear 13 is positioned at the space that is surrounded by the headrest 3.Flange member 2 has the hole at the center, forms ring-type, at the interior side's of flange member 2 end face (in Fig. 4, the right side), blocks described hole, fixed earphone parts 5.Earphone unit 5 have flat shelly pedestal 6, be embedded in the diameter of inner bottom part of the pedestal 6 more flat shelly littler than pedestal 6 yoke 7, be fixed on the inner bottom part center of yoke 7 flat magnet 8, be fixed on the end face of magnet 8 tabular pole shoe 9, be wound as sound coil 10 cylindraceous, dome-type vibrating reed 12.
The open sides end face of the yoke 7 of shelly and the end face of pole shoe 9 roughly are positioned at one side, and the gap that has ring-type between the distolateral inner peripheral surface of opening of the outer peripheral face of pole shoe 9 and yoke 7, put into described sound coil 10 in this gap.Gap in described ring-type forms the magnetic field of magnet 8 as the source, has sound coil 10 in this magnetic field.Described vibrating reed 12 surrounds the circular top part of central part, and forming cross sectional shape is the edge part of partial arc shape, and the periphery of edge part is fixed on the pedestal 6, and vibrating reed 12 can supported quiveringly.The fixing end of sound coil 10 on the border of the described center circle top of vibrating reed 12 and edge part, sound coil 10 is being supported, and does not contact yoke 7, does not also contact pole shoe 9.To sound coil 10 input note signals, sound coil 10 is according to note signal from the power amplifier (driver) of the player of outside, and front and back drive, follow in this, and vibrating reed 12 vibrations, thus sound from vibrating reed 12.This sound arrives the ear 13 that is surrounded by the headrest 3 by the hole of flange member 2.
More than explanation is the explanation to general earphone, for noise removing formula earphone, in described structure the microphone of additional detected ambient noise, generate by the circuit of the noise-cancelling signal of the opposite phase of the detected noise of this microphone, with the noise-cancelling signal that generates and note signal synthetic (addition) and signal processing circuits such as combiner circuit that sound coil 10 is imported.
According to design philosophy, set the allocation position of the microphone that detects ambient noise.In Fig. 4, M1～M4 represents the various examples of noise measuring with the allocation position of microphone.M1 is the example in the earphone internal configurations, is the example that the space before next-door neighbour's vibrating reed 12 disposes towards the outside.M2～M4 is that M2 is the top that is configured in flange member 2 at the example of the outside of earphone configuration, and M3 is the bottom that is configured in flange member 2, and M4 is the example that is configured in the lateral surface of shell 1.
In noise removing formula earphone, in order more effectively to eliminate external noise, on the structure of noise measuring, various researchs have been carried out with the allocation position of microphone and signal processing circuit.For example, the earphone of patent documentation 1 record is in order to have the response of comparison uniform frequency on one side, reduce noise on one side, between vibrating membrane (vibrating reed of loud speaker) and external auditory meatus, little cavity is set, in this cavity, near vibrating membrane configuration microphone, coupling is based on the feedback signal of the output of described microphone in by the input electrical signal of headphone reproduction, this coupled signal is carried out power amplification, drive vibrating membrane.In example in the past shown in Figure 4, be example at the position configuration microphone of representing with symbol M 1.
The invention of patent documentation 2 record is in order to improve the noise removing effect, disposes microphone assembly across the vibrationproof member in the earphone unit that Active noise control using is used in earphone.
The invention of the invention of patent documentation 1 record, patent documentation 2 records all is in order to improve the performance of noise removing formula earphone, still can't to realize the purpose of describing later of the present invention.
As with other known technologies of structurally associated of the present invention, following technology is arranged.One makes 2 sound coil work in a magnetic circuit, therefore drive 2 vibrating reeds (with reference to patent documentation 3) with a magnetic circuit.1 sound coil and 1 vibrating reed, 1 sound coil and 1 vibrating reed is respectively in pairs in addition in addition.1 vibrating reed is as speaker operation, and 1 vibrating reed is as acoustical generator in addition, promptly as the ring back tone generating means work of mobile phone etc.Perhaps, can make it have dynamic speaker and two functions of magnet (magnetic) type.
The invention that is associated as invention with patent documentation 3 record, the known vibrating speaker parts that such formation is arranged, it has with magnetic circuit and sonorific first vibrating reed of sound coil, and can be with respect to the shell free swaying ground supporting in second vibrating reed with magnetic circuit integral body, when producing sound by first vibrating reed, the magnetic circuit that second vibrating reed is supported is given shell (with reference to patent documentation 4) with regard to transfer of vibration.Record is based on the vibrational energy of the shell of second vibrating reed vibrator as mobile phone, the perhaps bass of earphone vibration in patent documentation 4.
[patent documentation 1] Japanese kokai publication hei 6-343195 communique
[patent documentation 2] Japan opens flat 5-36991 communique in fact
[patent documentation 3] Japanese kokai publication hei 11-252683 communique
[patent documentation 4] TOHKEMY 2000-165987 communique
Summary of the invention
The objective of the invention is to, solve the problem of described noise removing earphone in the past.Promptly noise removing earphone in the past synthesizes signal that is used to eliminate noise and note signal electricity, be coupled, by signal processing circuit, so note signal is subjected to the influence of noise-cancelling signal, and the waveform disorder of note signal, sound quality deterioration.In addition, in serious, make the noise removing action carry out and all not produce the problem of lower tone, bring uncomfortable sensation to the user sometimes.
The objective of the invention is to, provide reduce noise-cancelling signal and note signal as far as possible comprise magnetic coupling, Electrostatic Coupling in interior electric coupling relation, reduce the influence that noise-cancelling signal brings to note signal, the power amplification circuit of noise-cancelling signal and the power amplification circuit of note signal do not become load each other, and the noise removing formula earphone of acoustical sound.
The objective of the invention is to,, also can eliminate noise, thereby prolong the noise removing formula earphone in the life-span of internal battery even provide little to the power (power) of the noise-cancelling signal of the sound coil input that is used to cancel noise.The objective of the invention is to, do not work even provide internal battery to consume noise canceller circuit, also same with the general earphone that does not have noise cancellation, can listen attentively to noise removing formula earphone based on the reproduction sound of note signal.
Main being characterised in that of the present invention, comprise a loudspeaker assembly, this loudspeaker assembly has a vibrating reed and drives two sound coils of this vibrating reed, at a sound coil input note signal, import based on the noise-cancelling signal of using the detected noise signal of microphone by noise measuring at another sound coil.
Perhaps, it is characterized in that, comprise a loudspeaker assembly, this loudspeaker assembly has a vibrating reed and drives the centre tapped sound coil of being with of this vibrating reed, import note signal between end of sound coil and centre cap, input is based on by the noise-cancelling signal of noise measuring with the detected noise signal of microphone between the other end of sound coil and centre cap.
By note signal and noise-cancelling signal, drive the sound coil be different in essence respectively, in earphone inside,, on sound, eliminate noise by sound based on the opposite phase of noise-cancelling signal, only arrive user's ear based on the sound of note signal.The described sound coil that is different in essence is driven by independent power amplifier (driver), and both sides' electric coupling is shallow, so that note signal is subjected to the influence of noise-cancelling signal is few, can reproduce note signal with high tonequality.
If improve the screening audio fruit of earphone,, also can cancel noise, so can prolong the life-span of internal battery even then the power (power) to the noise-cancelling signal of the sound coil input that is used to cancel noise is little.Even internal battery consumption, noise canceller circuit is not worked, and is similarly worked with the sound coil of the general earphone that does not have noise cancellation by the sound coil that note signal drives, so can listen attentively to sound based on note signal yet.
Description of drawings
Following brief description accompanying drawing.
Fig. 1 is the circuit diagram of the embodiment of expression earphone of the present invention.
Fig. 2 is the longitudinal section of the embodiment major part of expression earphone of the present invention.
Fig. 3 is the example and the routine schematic diagram of composition that can be applied in the manufacture method of the sound coil in the earphone of the present invention.
Fig. 4 is a longitudinal section of roughly representing the example of earphone in the past.
The explanation of symbol:
20-noise measuring microphone; The 21-signal processing circuit; The 22-power amplification circuit; The 23-internal battery; The 50-earphone unit; The 60-sound coil; 61-first sound coil; 62-second sound coil; The 70-vibrating reed.
Embodiment
Below, with reference to Fig. 1～Fig. 3, the embodiment of earphone of the present invention is described.The shell of earphone (housing) and on every side, for example structure of headrest etc. and example in the past shown in Figure 4 are same structures, so be that the center describes with earphone unit and the drive circuit thereof that constitutes main portion of the present invention.
[embodiment 1]
In Fig. 1, Fig. 2, symbol 60 expression sound coils, 70 expression vibrating reeds.As shown in Figure 2, vibrating reed 70 by the vibrating reed main body 71 that forms dome-type central part, to surround the cross sectional shape that forms around this vibrating reed main body 71 be that the edge part 72 of partial arc shape constitutes, the outer peripheral portion of this edge part 72 is fixed on the pedestal 56.For vibrating reed 70 is supported with the state that floats from pedestal 56, the part depression that pedestal 56 and vibrating reed 70 are relative.Sound coil 60 is that thin wire rod is wound as drum, and an end of tube is fixed on the described vibrating reed main body 71 of vibrating reed 70 and the boundary position of edge part 72.Sound coil 60 is characterised in that, is made of first sound coil 61 and second sound coil 62, and these 2 sound coils 61,62 are fixed on the vibrating reed 70, drives a vibrating reed 70.
Fig. 3 represents to be used to obtain the example of the coiling of described sound coil 60.In Fig. 3, in the periphery of coiling anchor clamps, at first be close to the wire rod that becomes first sound coil 61, the coiled stratiform then, is turned back in order, overlapping coiling, the sound coil of 2 layers of structure of formation.It is first sound coil 61, extracts the tag wire 63 at its two ends out from identical position.In Fig. 3, the numeral of representing by per 1 circle in the coiling 1～8th, ground floor, 9～15th, the second layer.Then, on first sound coil 61, the wire rod that becomes second sound coil 62 is close to equally, the coiled stratiform then, is turned back in order, overlapping coiling, the sound coil of 2 layers of structure of formation.Therefore, be 4 layers of structure as a whole.The tag wire 64 at the two ends of second sound coil 62 is extracted out from identical position.The tag wire 64 of second sound coil 62 and the tag wire 63 of first sound coil 61 from different positions for example the opposition side from the center that clips sound coil 60 extract out.In Fig. 3, the numeral of representing by per 1 circle in the coiling 16～23 is the 3rd layer, and 24～30 is the 4th layer.In example shown in Figure 2, from extract the tag wire 63 of first sound coil 61 and the tag wire 64 of second sound coil 62 out across the center of pedestal 56 side opposite each other.The tag wire at the two ends of first, second sound coil is as a pair of, and draw from identical position and be convenient to assemble earphone unit, therefore, first, second sound coil even number of reeling respectively.
In Fig. 2, described vibrating reed 70, sound coil 60, pedestal 56 constitute the part of earphone unit 50.Earphone unit 50 also has yoke 57, magnet 58, pole shoe 59 except described vibrating reed 70, sound coil 60, pedestal 56.Pedestal 56 is members of flat shelly, embeds the yoke 57 of the diameter more flat shelly littler than pedestal 56 at the inner bottom part of pedestal 56.At the flat magnet 58 of the inner bottom part center fixation of yoke 57, at the fixing pole shoe 59 of sheet of front end (in Fig. 2, the left end) face of magnet 58.Opening one side end face of the yoke 7 of shelly and the end face of pole shoe 59 roughly are positioned at one side, and form the gap of ring-type between the open end one side inner peripheral surface of the outer peripheral face of pole shoe 59 and yoke 7.In this gap, put into and be wound as the cylindric described sound coil 60 that is fixed on the vibrating reed 70.Gap in described ring-type forms the magnetic field of magnet 58 as the source, has sound coil 60 in this magnetic field.Sound coil 60 separates with the outer peripheral face of pole shoe 59 and the open end one side inner peripheral surface of yoke 57.At pedestal 56, for vibrating reed 70 energy free vibrations, be formed on a plurality of holes 561 that thickness direction connects pedestal 56, the space and the external communications of surrounding by pedestal 56 and vibrating reed 70.
Embedding in the earphone outer covering by described such earphone unit that constitutes 50, earphone outer covering is provided with the headrest, constitute earphone.
Fig. 1 represents the drive circuit example of the earphone of above explanation.In Fig. 1, the sound coil 60 that drives a vibrating reed 70 comprises 2 sound coils 61,62.In the outside of earphone or inboard suitable position configuration noise measuring with microphone 20.Noise signal by microphone 20 detections, conversion is imported signal processing circuit 21.In signal processing circuit 21, carry out the noise signal that is detected by microphone 20 is generated the suitable signal processing such as grade of the noise-cancelling signal of opposite phase.Signal processing circuit 21 can be made of analog signal processing circuit, also can be made of for example DSP (digital signal processing circuit) as Digital Signal Processing.From the noise-cancelling signal of signal processing circuit 21 outputs power amplification circuit 22 is imported, driven first sound coil 61 by power amplification circuit 22.Built-in power battery 23 in earphone, this internal battery 23 become the power supply that makes signal processing circuit 21, power amplification circuit 22 work.Second sound coil 62 is connected CD Player, MP3 player, other on player, are driven by the power amplification circuit of note signal by player arbitrarily.Also can drive first sound coil 61, drive second sound coil 62 with noise-cancelling signal with note signal.
Embodiment according to above explanation, have a sound coil of input noise erasure signal, only import the sound coil of note signal, so noise-cancelling signal and note signal are that the part that is fixed on the vibrating reed 70 of sound coil 60 is mechanically synthetic by the drive division of vibrating reed 70.Therefore, no matter on static, still all more shallow on magnetic, so both sides' power amplification circuit can not become load each other, note signal is not subjected to the influence of noise signal, can obtain the reproduction sound of acoustical sound in the electric coupling of first, second sound coil.
If the design of the screening sound of earphone is good, it is little also passable with the power of the noise-cancelling signal on the sound coil then to be applied to noise removing, so have the advantage in the life-span that can prolong internal battery.
In addition, even if internal battery consumption from player input note signal, also can be reproduced sound according to note signal.
[embodiment 2]
Sound coil also can pass through 1 fine rule of continuous overlapping coiling, extracts centre cap out, makes identical with the sound coil with first sound coil and second sound coil in fact.By between end of sound coil and centre cap, importing note signal, input is based on the noise-cancelling signal of the noise signal that is detected with microphone by noise measuring between the other end of sound coil and centre cap, can obtain the action effect identical with embodiment 1.By connecting first, second sound coil end separately of embodiment 1, also will constitute and the identical structure of extraction centre cap.
Claims (5)
1. earphone is characterized in that:
Comprise a loudspeaker assembly, this loudspeaker assembly has a vibrating reed and drives two sound coils of this vibrating reed;
To a sound coil input note signal, another sound coil is imported based on the noise-cancelling signal of being used the detected noise signal of microphone by noise measuring.
2. earphone is characterized in that:
Comprise a loudspeaker assembly, this loudspeaker assembly has a vibrating reed and drives the centre tapped sound coil of being with of this vibrating reed;
Import note signal between end of sound coil and centre cap, input is based on by the noise-cancelling signal of noise measuring with the detected noise signal of microphone between the other end of sound coil and centre cap.
3. earphone according to claim 1 and 2 is characterized in that:
Noise-cancelling signal is via being that power supply comes the power amplifier of work to be input to sound coil with the internal battery.
4. earphone according to claim 1 is characterized in that:
The structure of an above-mentioned sound coil and another sound coil is that a side layeredly overlaps on the opposing party.
5. earphone according to claim 1 is characterized in that:
An above-mentioned sound coil and another sound coil are wound as multilayer respectively, and extract out from the position that differs from one another at the two ends of the two ends of a sound coil and another sound coil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006278564A JP2008098988A (en) | 2006-10-12 | 2006-10-12 | headphone |
| JP278564/2006 | 2006-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101163350A true CN101163350A (en) | 2008-04-16 |
Family
ID=39298148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101524038A Pending CN101163350A (en) | 2006-10-12 | 2007-10-11 | Earphone |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2008098988A (en) |
| CN (1) | CN101163350A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583059A (en) * | 2008-05-15 | 2009-11-18 | 欧力天工股份有限公司 | Noise-cancelling headphone |
| CN102238452A (en) * | 2011-05-05 | 2011-11-09 | 安百特半导体有限公司 | A method for actively anti-noise in hands-free earphones and hands-free earphones |
| CN109275060A (en) * | 2018-11-29 | 2019-01-25 | 深圳聚米科技有限公司 | A kind of high tone quality intelligent wireless Internet of Things earphone |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009278167A (en) * | 2008-05-12 | 2009-11-26 | Audio Technica Corp | Noise canceling type headphone |
| JP5080374B2 (en) * | 2008-06-12 | 2012-11-21 | 株式会社オーディオテクニカ | Noise-canceling headphones |
| JP5320040B2 (en) * | 2008-11-27 | 2013-10-23 | 株式会社熊谷組 | Vibrator |
| KR101054304B1 (en) | 2010-06-22 | 2011-08-08 | 주식회사 비에스이 | Amplifier mounted micro speaker |
| JP6499408B2 (en) * | 2014-07-02 | 2019-04-10 | クラリオン株式会社 | Speaker device |
| US20200363565A1 (en) * | 2017-11-22 | 2020-11-19 | Optotune Consumer Ag | Optical device, particularly camera, comprising autofocus and optical image stabilization |
| CN118524335B (en) * | 2024-07-23 | 2024-09-24 | 瑞声光电科技(常州)有限公司 | Voice coil and loudspeaker module |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH033344U (en) * | 1989-05-30 | 1991-01-14 |
-
2006
- 2006-10-12 JP JP2006278564A patent/JP2008098988A/en active Pending
-
2007
- 2007-10-11 CN CNA2007101524038A patent/CN101163350A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583059A (en) * | 2008-05-15 | 2009-11-18 | 欧力天工股份有限公司 | Noise-cancelling headphone |
| CN101583059B (en) * | 2008-05-15 | 2014-01-01 | 欧力天工股份有限公司 | Noise Canceling Headphones |
| CN102238452A (en) * | 2011-05-05 | 2011-11-09 | 安百特半导体有限公司 | A method for actively anti-noise in hands-free earphones and hands-free earphones |
| CN109275060A (en) * | 2018-11-29 | 2019-01-25 | 深圳聚米科技有限公司 | A kind of high tone quality intelligent wireless Internet of Things earphone |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008098988A (en) | 2008-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101163350A (en) | Earphone | |
| JP3193281U (en) | Piezoelectric speaker | |
| CN1090886C (en) | Earphone | |
| KR100958470B1 (en) | Audio transducer component | |
| CN101163351A (en) | Earphone | |
| US20070154049A1 (en) | Transducer, headphone and method for reducing noise | |
| JP3150873U (en) | headphone | |
| KR101092958B1 (en) | Ear set | |
| WO2007086524A1 (en) | Electronic device and sound reproducing method | |
| CN103460714A (en) | Ear microphone and voltage control device for ear microphone | |
| CN101849419B (en) | Method of improving sound reproduction and listening enjoyment | |
| US8611583B2 (en) | Compact coaxial crossover-free loudspeaker | |
| CN103179483A (en) | In-Ear Headphones with Multiple Dynamic Drivers | |
| CN109246534A (en) | A kind of horn single body and a kind of audio-frequence player device | |
| JP3045032B2 (en) | headphone | |
| JP4963979B2 (en) | headphone | |
| JP3906728B2 (en) | Speaker | |
| CN203896502U (en) | Piezoelectric loudspeaker | |
| CN207460437U (en) | A kind of panel earphone pronunciation device and earphone | |
| US20230052353A1 (en) | Loudspeaker and electronic device | |
| CN203193841U (en) | In-Ear Headphones with Multiple Dynamic Drivers | |
| CN210183541U (en) | Multi-sound-emitting unit combined structure | |
| JP4707160B2 (en) | headphone | |
| CN101483796B (en) | Head phone | |
| JP2014045472A (en) | Sound field supporting device and sound field supporting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20080416 |