WO2019059006A1 - Dispositif acoustique - Google Patents

Dispositif acoustique Download PDF

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Publication number
WO2019059006A1
WO2019059006A1 PCT/JP2018/033274 JP2018033274W WO2019059006A1 WO 2019059006 A1 WO2019059006 A1 WO 2019059006A1 JP 2018033274 W JP2018033274 W JP 2018033274W WO 2019059006 A1 WO2019059006 A1 WO 2019059006A1
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WO
WIPO (PCT)
Prior art keywords
sound
audio signal
phase
speakers
channel
Prior art date
Application number
PCT/JP2018/033274
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English (en)
Japanese (ja)
Inventor
正則 小杉
哲也 江川
Original Assignee
株式会社東海理化電機製作所
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Filing date
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Application filed by 株式会社東海理化電機製作所 filed Critical 株式会社東海理化電機製作所
Publication of WO2019059006A1 publication Critical patent/WO2019059006A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control

Definitions

  • the present invention relates to an acoustic device.
  • a cancellation signal for the downmixed signal is generated, the sound by the downmixed signal is output from the first speaker, and the sound by the cancellation signal is symmetrical to the first speaker
  • the cancellation signal is an antiphase signal of the sensed sound signal, and it is said that the sound can be prevented from propagating to other space and the noise to the outside can be cut off.
  • the acoustic device disclosed in Patent Document 1 does not assume that the relative position between the viewer and the speaker changes. For this reason, in the said audio apparatus, when the relative position of a viewer and a speaker changes, the subject that a sound image can not be maintained arises. In particular, when the speaker is mounted on the steering wheel, the relative position between the occupant (driver) and the speaker changes, which causes a problem that the three-dimensional sound image localized in the ear of the occupant (driver) can not be maintained.
  • An object of the present invention is to provide an acoustic device capable of maintaining a three-dimensional sound image even when the relative position between an occupant (driver) and a speaker changes.
  • An acoustic device has the following configurations [1] to [10].
  • An acoustic device mounted on a vehicle comprising at least two speakers arranged to sandwich the center line of the seat on the front side of the front of an occupant seated in the seat, the occupant, and the at least two Based on the position detection unit that detects the relative position of the speakers, and the relative position detected by the position detection unit, each speaker is output so as to maintain a three-dimensional sound image by the sound output from the at least two speakers.
  • An acoustic device comprising: [2] The acoustic device according to the above [1], wherein the at least two speakers are provided on a steering wheel of the vehicle.
  • the acoustic device according to the above [1] or [2], wherein the at least two speakers are arranged symmetrically with respect to a center line of the steering wheel.
  • the sound device according to any one of [1] to [3], wherein the directivity of the output of each of the at least two speakers is omnidirectional.
  • the acoustic device according to any one of [1] to [4], wherein the at least two speakers are provided in a switch device provided on a steering wheel.
  • the control unit is configured to, among the at least two speakers, an audio signal of a right channel corresponding to a speaker disposed on the right side with respect to the center line, and the center line of the at least two speakers.
  • Phase adjusting means for performing phase delay processing according to the relative position to the audio signal of the left channel corresponding to the speaker disposed on the left side with respect to the above, the audio signal of the right channel and the phase adjusting means
  • the left-channel audio signal delayed by phase, the left-channel audio signal and the right-channel audio signal delayed by the phase adjustment means are respectively added and drive signals of left and right channels are added.
  • the acoustic device according to any one of the above [1] to [5], including an addition unit that outputs.
  • the control unit is configured to combine the sound based on the sound signal of the right channel with the sound based on the sound signal of the right channel delayed by the phase adjustment unit in the right ear of the occupant Of the passenger such that the synthetic sound of the sound based on the voice signal of the left channel and the sound based on the voice signal of the left channel phase-delayed by the phase adjustment means is minimized, and In the left ear, the synthesized sound of the sound based on the audio signal of the left channel and the sound based on the audio signal of the left channel delayed in phase by the phase adjustment means is maximized, and the audio signal of the right channel is Synthesis of the sound based on the sound and the sound based on the audio signal of the right channel phase-delayed by the phase adjustment means is minimized , Respectively set the phase difference in said phase adjusting means, the acoustic apparatus according to [6].
  • the acoustic apparatus as described in.
  • the position detection unit includes a steering angle sensor that detects a steering angle associated with the rotation operation of the steering wheel, the steering angle, and distances from the at least two speakers to the right and left ears of the occupant.
  • the storage unit stores in advance the relationship of the above, and based on the steering angle detected by the steering angle sensor, from the storage unit to the relative position as the relative position from the at least two speakers to the right and left ears of the occupant.
  • the acoustic device according to any one of the above [1] to [8], which calculates each of the distances.
  • an acoustic device capable of maintaining a three-dimensional sound image even when the relative position between an occupant (driver) and a speaker changes.
  • FIG. 1 is a top plan view of an exemplary arrangement of speakers in an acoustic device according to an embodiment of the present invention as viewed from above the vehicle.
  • FIG. 2 is a side view of the acoustic device shown in FIG. 1 as viewed from the A direction.
  • FIG. 3A is a front view showing a steering wheel in a case where left and right speakers are respectively provided in spokes of a steering wheel as an arrangement example of the speakers in the acoustic device according to the embodiment.
  • FIG. 3B is a front view showing a steering wheel in a case where left and right speakers are respectively provided on steering switches provided on the steering wheel as an arrangement example of the speakers in the acoustic device according to the embodiment.
  • FIG. 1 is a top plan view of an exemplary arrangement of speakers in an acoustic device according to an embodiment of the present invention as viewed from above the vehicle.
  • FIG. 2 is a side view of the acoustic device shown in FIG. 1 as viewed from the A
  • FIG. 4A is an explanatory view showing the directivity in the XY plane of the directivity of the speaker when the directivity of the speaker is omnidirectional.
  • FIG. 4B is an explanatory view showing the directivity in the XZ plane of the directivity of the speaker when the directivity of the speaker is omnidirectional.
  • FIG. 5 is a top plan view corresponding to FIG. 1 showing the positional relationship between the two speakers and the occupant (driver) when the steering wheel is rotated and the steering angle ⁇ is detected.
  • the acoustic device 1 is the acoustic device 1 mounted on the vehicle 5, and the center line 11 of the seat 10 is on the front side of the driver 20 who is an occupant seated on the seat 10.
  • the control unit 100 is configured to control the characteristics of the sound output from each of the speakers 30 and 40 so that the three-dimensional sound image of the sound output from the two speakers 30 and 40 is maintained.
  • the driver is the driver 20.
  • two speakers 30 and 40 will be described as being arranged symmetrically with respect to the center line 8 a of the steering wheel 8.
  • the speakers 30, 40 are disposed in front of the seat 10, that is, in front of the driver 20 seated in the seat 10.
  • the two speakers 30, 40 are, for example, arranged symmetrically with respect to the center line 8a of the steering wheel 8.
  • the speakers 30 and 40 can output sound in a predetermined frequency band, and can output, for example, a warning sound, a warning sound, and the like by control from the vehicle side.
  • the direction of the ear of the driver 20 from the speaker is X
  • the width direction of the vehicle 5 is Y
  • the direction defined by the outer product of X and Y axes is The Z direction is the vertical direction of 5.
  • the right speaker 30 is disposed such that its directivity is strong toward the right ear 21 of the driver 20.
  • the left speaker 40 is disposed such that the directivity thereof becomes stronger toward the left ear 22 of the driver 20. That is, by mounting the speakers 30, 40 on the steering wheel 8, the output shaft 31 of the right speaker 30 can be directed in the direction of the right ear 21 of the driver 20, and the output shaft 41 of the left speaker 40 operates. In the direction of the left ear 22 of the person 20.
  • the left speaker 40 is disposed slightly upward toward the driver's 20 ear.
  • the X axis and the Z axis are X, Y and Z axes which are slightly rotated around the Y axis.
  • the left speaker 40 is slightly upward (so that the output shaft 41 of the left speaker 40 is in the direction of the left ear 22 of the driver 20) Is arranged in the X axis direction).
  • the right speaker 30 is disposed slightly upward (in the X-axis direction).
  • the directivity of the two speakers 30 and 40 is arranged to be stronger toward the ears 21 and 22 of the occupant.
  • two speakers 30, 40 may be provided in the spokes 9 of the steering wheel 8, respectively. That is, with respect to the center line 8 a of the steering wheel 8, the right speaker 30 can be disposed on the right side of the spoke portion 9, and the left speaker 40 can be disposed on the left side of the spoke portion 9.
  • the center line 8a of the steering wheel 8 is a line passing through the center of the steering wheel 8 when the steering angle is zero when the steering operation is not performed.
  • the right audio signal S1 and the left audio signal S2 to the right speaker 30 and the left speaker 40 can be input from the vehicle body side via, for example, a steering roll connector (not shown).
  • two speakers 30, 40 can be provided in the steering switches 50, 60 as switch devices provided on the steering wheel 8, respectively. That is, the right speaker 30 is disposed on the steering switch 50 provided on the right side of the spoke portion 9 with respect to the center line 8 a of the steering wheel 8, and the left speaker 40 is disposed on the steering switch 60 provided on the left side of the spoke portion 9 be able to.
  • the steering switches 50 and 60 are switches that can be used for vehicle operation, air conditioning control, audio control, car navigation operation, and the like.
  • the two speakers 30, 40 can be electrically connected to the vehicle body side together with the steering switches 50, 60, for example, via a steering roll connector (not shown).
  • the right audio signal S1 and the left audio signal S2 to the right speaker 30 and the left speaker 40 can be input from the vehicle body side via, for example, a steering roll connector (not shown).
  • the directivity characteristics of the speaker shown in FIG. 4A and FIG. 4B show the case where the directivity of the speaker is omnidirectional.
  • the directivity characteristic indicating the spread of the sound output from the speakers 30 and 40 is maximum at point 36a on the X axis of the sound wave surface 36, and the sound pressure is reduced by 6 dB from the maximum sound pressure on the X axis
  • the opening angle defined by the points 36 b and 36 c is defined as the directivity angle ⁇ .
  • the pointing angle in the Y direction is ⁇ .
  • the directional characteristic indicating the spread of the sound output from the speakers 30 and 40 has the maximum point 36a on the X axis of the sound wave surface 36, and the sound pressure drops by 6 dB from the maximum sound pressure on the X axis
  • the opening angle defined by the points 36 b and 36 c is defined as the directivity angle ⁇ .
  • the directivity angle in the Z direction is ⁇ .
  • the directivity characteristics of the speaker shown in FIGS. 4A and 4B have omnidirectionality (nondirectionality). .
  • omnidirectional speakers 30 and 40 By mounting such omnidirectional speakers 30 and 40 on the steering wheel 8, the sound output from the speakers 30 and 40 can be obtained even when the steering wheel 8 is rotated with the operation of the vehicle 5. Localization of the sound image is easy to maintain.
  • the position detection unit 70 detects the relative position of the driver 20 and the two speakers 30 and 40. By detecting this relative position, the linear distance between the speakers 30, 40 and the right ear 21 and the left ear 22 of the driver 20 can be calculated. This calculation can be performed by an operation unit, for example, a microcomputer, provided in the position detection unit 70.
  • the position detection unit 70 can be, for example, a steering angle sensor that detects a steering angle ⁇ accompanying the rotation operation of the steering wheel 8 as shown in FIG. 2.
  • the steering angle sensor can be shared with a steering angle sensor provided for the vehicle 5 to perform control associated with various driving operations.
  • the position detection unit 70 is not limited to the steering angle sensor, and may be any device that detects the relative position of the driver 20 and the two speakers 30 and 40.
  • a camera (not shown) mounted on an instrument panel or a camera (not shown) mounted on a steering wheel may be used. Based on the images taken by these cameras, for example, the positions of the right ear 21 and the left ear 22 of the driver 20 are specified by a template matching method, and the position of the spokes 9 of the steering wheel 8 is detected. Thus, the relative position between the driver 20 and the two speakers 30, 40 can be detected.
  • the control unit 100 includes a drive unit 110 that drives the right speaker 30 and a drive unit 120 that drives the left speaker 40.
  • the driving unit 110 adds the right audio signal S1 and the phase adjustment signal S21 of the left audio signal S2 and amplifies the same to drive the right speaker 30.
  • the drive unit 120 adds the left audio signal S2 and the phase adjustment signal S12 of the right audio signal S1 and amplifies the same to drive the left speaker 40.
  • the phase adjustment circuit 115 adjusts the phase of the right audio signal S1 (phase delay), and outputs the phase adjustment signal S12 to the drive unit 120.
  • the phase adjustment can be appropriately set as the phase difference ⁇ ° between the right audio signal S1 and the phase adjustment signal S12.
  • the phase adjustment circuit 125 adjusts the phase of the left audio signal S2 (phase delay), and outputs the phase adjustment signal S21 to the drive unit 110.
  • the phase adjustment can be appropriately set as the phase difference ⁇ ° between the left audio signal S2 and the phase adjustment signal S21.
  • the setting of the phase difference ⁇ ° is a case where the two speakers 30, 40 are arranged symmetrically with respect to the center line 11 of the seat 10, and the speakers 30, 40 sandwich the center line 11 of the seat 10.
  • the phase difference set by the phase adjustment circuit 115 and the phase adjustment circuit 125 can be set to different values when they are arranged asymmetrically.
  • Each of the drive units 110 and 120 and the phase adjustment circuits 115 and 125 described above can adjust the gain. Therefore, as shown in FIG. 1, the addition ratio of the right audio signal S1 and the phase adjustment signal S21 in the drive unit 110 and the addition ratio of the left audio signal S2 and the phase adjustment signal S12 in the drive unit 120 can be adjusted. Moreover, the sound pressure output from the right speaker 30 and the left speaker 40 can be adjusted, and the balance between the left and right stereo sounds can also be adjusted.
  • the control unit 100 controls the characteristics of the sound output from each of the speakers so that the three-dimensional sound image of the sounds output from the two speakers 30 and 40 is maintained.
  • the right ear 21 receives the sound S30 of the right channel output from the right speaker 30 and the phase-adjusted sound S40d of the left channel, and the sound S40 of the left channel output from the left speaker 40 and the phase of the right channel The adjusted sound S30d arrives.
  • the sound of the right channel that reaches the right ear 21 is the sound S30 of the right channel and the phase-adjusted sound S30d of the right channel.
  • the sound of the left channel reaching the right ear 21 is the sound S40 of the left channel and the sound S40d of which the phase is adjusted in the left channel.
  • control unit 100 determines that the synthesized sound of the sound S30 of the right channel and the phase-adjusted sound S30d of the right channel is the largest, and the synthesized sound of the sound S40 of the left channel and the phase-adjusted sound S40d is the smallest. Control to be
  • the control unit 100 proceeds to the sound S30 traveling on the distance L11 and the distance L21.
  • a distance L11 is a distance from the right speaker 30 to the right ear 21, and a distance L21 is a distance from the left speaker 40 to the right ear 21.
  • the synthesized sound of the sound S40 of the left channel and the phase-adjusted sound S40d of the left channel can be minimum at the right ear 21.
  • the sound S30 of the right channel and the left sound can be detected at the position of the right ear 21.
  • Cross talk of the channel sound S40 is reduced or canceled.
  • the left ear 22 receives the sound S40 of the left channel output from the left speaker 40 and the phase-adjusted sound S30d of the right channel, and the sound S30 of the right channel output from the right speaker 30 The phase-adjusted sound S40d of the left channel arrives.
  • the sound of the left channel reaching the left ear 22 is the sound S40 of the left channel and the phase-adjusted sound S40d of the left channel.
  • the sound of the right channel reaching the left ear 22 is the sound S30 of the right channel and the sound S30d of which the phase of the right channel is adjusted.
  • control unit 100 determines that the synthesized sound of the sound S40 of the left channel and the phase-adjusted sound S40d of the left channel is the largest, and the synthesized sound of the sound S30 of the right channel and the phase-adjusted sound S30d is the smallest. Control to be
  • the control unit 100 proceeds the sound S40 traveling on the distance L22 and the distance L12.
  • the distance L22 is the distance from the left speaker 40 to the left ear 22
  • the distance L12 is the distance from the right speaker 30 to the left ear 22.
  • the sound can be localized at the ear, and control can be performed such that a three-dimensional sound image by the sounds output from the two speakers is maintained.
  • the distance L11 from the right speaker 30 to the right ear 21 described above can be expressed by a function L11 ( ⁇ ) that changes with the steering angle ⁇ .
  • the distance L22 from the left speaker 40 to the left ear 22 can be represented by a function L22 ( ⁇ ).
  • the distance L12 from the right speaker 30 to the left ear 22 can be represented by a function L12 ( ⁇ )
  • the distance L21 from the left speaker 40 to the right ear 21 can be represented by a function L21 ( ⁇ ).
  • L11 ( ⁇ ), L22 ( ⁇ ), L12 ( ⁇ ), and L21 ( ⁇ ) can be calculated from the steering angle ⁇ stored in advance in the position detection unit 70 and the table values of the respective distances.
  • the linear distances to the speakers 30, 40 and the right ear 21 and the left ear 22 can be three-dimensionally calculated and calculated based on the steering angle ⁇ .
  • the distance L22, the distance L12 from the right speaker 30 to the left ear 22, and the distance L21 from the left speaker 40 to the right ear 21 are functions L11 ( ⁇ ), L22 ( ⁇ ), L12 ( ⁇ ) of the steering angle ⁇ , respectively. It may be controlled as L21 ( ⁇ ).
  • the control unit 100 controls the localization of the sound image in a state in which
  • the embodiment of the present invention is not limited to the two speakers shown above, and is applicable to the case where three or more speakers are arranged with the center line 11 of the seat 10 interposed therebetween. That is, in consideration of the distance from the speaker of the sound output from each speaker to the occupant's ear and the phase difference, the phase difference should be set so that the synthesized sound is maximum and minimum in each of the right and left ears. The crosstalk between the sound of the right channel and the sound of the left channel is reduced or canceled out. Thus, even in the case of three or more speakers, sound can be localized at the ear, and control can be performed so that a three-dimensional sound image by sounds output from three or more speakers is maintained.
  • the acoustic device 1 is the acoustic device 1 mounted on the vehicle 5 and is located at the center of the seat 10 on the front side of the driver 20 who is an occupant seated in the seat 10.
  • the position detection unit 70 that detects the relative position of the two speakers 30, 40 arranged so as to sandwich the line 11, the driver 20 and the two speakers 30, 40
  • the control unit 100 is configured to control the characteristics of the sound output from each of the speakers 30 and 40 so that the three-dimensional sound image of the sound output from the two speakers 30 and 40 is maintained.
  • the position detection unit 70 for detecting the relative position of the driver 20 and the two speakers 30 and 40 Since the position detection unit 70 for detecting the relative position of the driver 20 and the two speakers 30 and 40 is provided, the steering wheel is rotated and the relative position between the passenger (driver) and the speaker changes. However, it can maintain a three-dimensional sound image. (2) Since the position detection unit 70 is provided, even when the steering wheel is rotated and the localization of the sound S30 in the right channel and the sound S40 in the left channel is interchanged, localization is made to the ears of the occupant (driver) It is controllable to maintain a three-dimensional sound image.
  • Each speaker can be provided in the spokes 9 of the steering wheel 8 or can be provided in the steering switches 50 and 60 as switch devices provided in the steering wheel 8.
  • the switch device mounted on the steering wheel can be provided with an audio notification means, and the functions of the steering switch can be expanded.
  • the localization control of the sound image by the control unit 100 is possible, and in particular, by making the directivity of the speakers 30, 40 omnidirectional (nondirectional), the output from the speaker mounted on the steering wheel Sound can be stably localized at the ear of a passenger (driver).
  • Reference Signs List 1 acoustic device 5 vehicle 8 steering wheel 8a center line 20 driver 21 right ear 22 left ear 30 speaker 40 left speaker 50, 60 steering switch 70 position detection unit 100 control unit 110 drive unit 115 phase adjustment circuit 120 drive unit 125 phase adjustment circuit

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Stereophonic System (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

L'invention concerne un dispositif acoustique (1) monté dans un véhicule (5) et comprenant : deux haut-parleurs (30, 40) agencés de façon à ce qu'une ligne centrale (11) d'un siège (10) soit interposée entre eux, davantage vers l'avant que l'avant d'un conducteur (20) qui est un occupant assis dans le siège (10) ; une unité de détection de position (70) qui détecte la position relative d'un conducteur (20) et des deux haut-parleurs (30, 40) ; et une unité de commande (100) qui commande les caractéristiques du son émis par chaque haut-parleur (30, 40), sur la base de la position relative détectée par l'unité de détection de position (70), de façon à maintenir une image sonore stéréophonique provoquée par le son émis par les deux haut-parleurs (30, 40).
PCT/JP2018/033274 2017-09-19 2018-09-07 Dispositif acoustique WO2019059006A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017179092A JP2019051908A (ja) 2017-09-19 2017-09-19 音響装置
JP2017-179092 2017-09-19

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WO2019059006A1 true WO2019059006A1 (fr) 2019-03-28

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WO (1) WO2019059006A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021192166A1 (fr) * 2020-03-26 2021-09-30 日本電信電話株式会社 Système acoustique
WO2021192167A1 (fr) * 2020-03-26 2021-09-30 日本電信電話株式会社 Système de haut-parleurs

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CN101594409A (zh) * 2009-03-04 2009-12-02 延锋百利得（上海）汽车安全系统有限公司 一种具有声音采集系统的方向盘
JP2010164970A (ja) * 2009-01-16 2010-07-29 Samsung Electronics Co Ltd オーディオシステム及びその出力制御方法
JP2011244431A (ja) * 2010-05-18 2011-12-01 Harman Becker Automotive Systems Gmbh 音響信号の個別化
WO2015086040A1 (fr) * 2013-12-09 2015-06-18 Huawei Technologies Co., Ltd. Appareil et procédé d'amélioration de la perception spatiale d'un signal audio
JP2015144395A (ja) * 2014-01-31 2015-08-06 新日本無線株式会社 音響信号処理装置
CN106741115A (zh) * 2017-02-16 2017-05-31 蚌埠市建金智能科技有限公司 一种汽车多媒体智能方向盘

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010164970A (ja) * 2009-01-16 2010-07-29 Samsung Electronics Co Ltd オーディオシステム及びその出力制御方法
CN101594409A (zh) * 2009-03-04 2009-12-02 延锋百利得（上海）汽车安全系统有限公司 一种具有声音采集系统的方向盘
JP2011244431A (ja) * 2010-05-18 2011-12-01 Harman Becker Automotive Systems Gmbh 音響信号の個別化
WO2015086040A1 (fr) * 2013-12-09 2015-06-18 Huawei Technologies Co., Ltd. Appareil et procédé d'amélioration de la perception spatiale d'un signal audio
JP2015144395A (ja) * 2014-01-31 2015-08-06 新日本無線株式会社 音響信号処理装置
CN106741115A (zh) * 2017-02-16 2017-05-31 蚌埠市建金智能科技有限公司 一种汽车多媒体智能方向盘

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021192166A1 (fr) * 2020-03-26 2021-09-30 日本電信電話株式会社 Système acoustique
WO2021192167A1 (fr) * 2020-03-26 2021-09-30 日本電信電話株式会社 Système de haut-parleurs
JP7364044B2 (ja) 2020-03-26 2023-10-18 日本電信電話株式会社 スピーカシステム

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