EP0809413A1 - Dispositif audio pour une voiture - Google Patents

Dispositif audio pour une voiture Download PDF

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Publication number
EP0809413A1
EP0809413A1 EP97201495A EP97201495A EP0809413A1 EP 0809413 A1 EP0809413 A1 EP 0809413A1 EP 97201495 A EP97201495 A EP 97201495A EP 97201495 A EP97201495 A EP 97201495A EP 0809413 A1 EP0809413 A1 EP 0809413A1
Authority
EP
European Patent Office
Prior art keywords
audio device
amplification
telephone
loudspeakers
vehicle
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.)
Withdrawn
Application number
EP97201495A
Other languages
German (de)
English (en)
Inventor
Andreas Völkel
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.)
Mannesmann VDO AG
Original Assignee
Philips Patentverwaltung GmbH
Koninklijke Philips Electronics NV
Philips Electronics NV
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 Philips Patentverwaltung GmbH, Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0809413A1 publication Critical patent/EP0809413A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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

Definitions

  • the invention relates to an audio device for a vehicle, the audio device having at least two amplification channels, each of which delivers an output signal depending on the signal of a signal source, by means of which loudspeakers can be controlled.
  • Such an audio device is known from JP 4-270539.
  • This known device has an amplifier unit, by means of which four loudspeakers can be controlled.
  • the amplifier unit can be controlled either by the output signals of a tuner, a magnetic tape cassette device or a CD player.
  • a telephone unit is provided which has a hands-free microphone which is usually installed on the driver's side of the vehicle. For the reproduction of the voice signals received by the telephone module, one of the four loudspeakers of the vehicle is decoupled from the amplifier unit in telephone operation by means of a switch and used as a telephone loudspeaker.
  • the sound center is fixed in the telephone mode by the installation location of the selected loudspeaker.
  • the volume of this speaker cannot be changed in telephone mode.
  • the audio device can be controlled by at least one first signal source with an audio signal or a second signal source, in particular a telephone unit, with a voice signal is that the amplification factors of the amplification channels are individually adjustable and that the audio device switches over the amplification factors of the amplification channels as a function of the signal source driving the audio device.
  • the first signal source is e.g. a magnetic tape cassette device, a tuner or a CD player is conceivable.
  • the gain factors of the gain channels can, for example, be set individually by an operator when operating the first signal source by actuating operating elements of an operating unit. If there is a call in the telephone unit or if the operator wants to make a telephone call himself, the audio device is activated by the second signal source with the voice signal of the telephone unit.
  • the switchover of the signal source controlling the audio device can either be carried out by the operator, e.g. if this wants to make a phone call or, for example, for incoming phone calls, an automatic source switchover can take place immediately or if the connection is established successfully.
  • the telephone unit usually has a hands-free microphone, which is usually placed on the left driver's side of the vehicle.
  • a hands-free microphone which is usually placed on the left driver's side of the vehicle.
  • the audio device when activated by the second signal source, preferably switches the amplification factors of the amplification channels in such a way that the sound center of the loudspeakers is sufficiently far away from the hands-free microphone.
  • the sound center can then be moved to the driver's side, for example, in order to avoid unnecessarily bothering the passenger with the telephone conversation.
  • the sound center can be adjusted by means of the individually adjustable amplification factors of the amplification channels the loudspeaker in the telephone mode can be selected individually and flexibly and thus be adapted, for example, to the vehicle type and the individual feeling of the operator.
  • the volume of the playback of the voice signal received by the telephone unit can also be set individually.
  • An advantageous embodiment of the invention is characterized in that the audio device has at least four amplification channels for controlling four loudspeakers, so that by means of suitable adjustment of the amplification factors, amplification channels, the sound center of the loudspeakers can be moved to any location in the interior of the vehicle.
  • two loudspeakers are usually installed in the front area and two loudspeakers in the rear area of the interior of the vehicle, in each case on the left and the right side.
  • These four loudspeakers can be individually controlled by four amplification channels of the audio device, so that with a suitable setting of the amplification channels, the sound center of the loudspeakers can be moved to any location in the interior of the vehicle.
  • the audio device is controlled by the first signal source with an audio signal, the operator can adjust the sound center according to his individual wishes and needs, for example by means of a corresponding control unit. If the driver of the vehicle drives alone, he will preferably set the sound center to the driver's position at the front left.
  • the operator will preferably set the sound center to the center of the interior of the vehicle. If the driver or the operator would like to make a phone call or a telephone call is received by the telephone unit, the audio device is activated by the telephone unit and the amplification factors of the amplification channels are switched over and the sound center is shifted. Since four loudspeakers are now available for the reproduction of the voice signal received by the telephone unit, the sound center can be used anywhere in the telephone mode of the interior of the vehicle. This sound center will generally be different from the sound center that was set by the operator during the operation of the first signal source.
  • the amplification factors of the amplification channels when actuated by means of the second signal source can be set in such a way that the above-mentioned acoustic feedback is avoided. Since the sound center of the loudspeakers can be moved to any location in the interior of the vehicle in telephone operation, the sound center can be set individually according to user needs and the acoustic conditions of the interior of the vehicle.
  • a further advantageous embodiment of the invention is characterized in that the switching of the amplification factors of the amplification channels takes place continuously during a predefinable period of time, so that the sound center of the loudspeakers is continuously shifted essentially in a linear manner.
  • the period of time during which the gain factors are switched can be individually adapted to the wishes of the user and to the acoustic characteristics of the interior of the vehicle.
  • a further advantageous embodiment of the invention is characterized in that the amplification factors of the amplification channels, when activated by means of the second signal source, are set such that the sound center of the loudspeakers is on the passenger side.
  • the hands-free microphone of the telephone unit is usually located on the left side of the vehicle near the driver. To the one mentioned above To avoid acoustic feedback, it is convenient to move the sound center of the speakers to the passenger side when the telephone unit is operating.
  • a further advantageous embodiment of the invention is characterized in that the gain factors to which the audio device switches when activated by the second signal source can be set by an operator using a software program.
  • the gain factors of the gain channels of the audio device when activated by the first signal source can preferably be set by the operator during operation by operating an operating unit. This enables the operator to adapt the sound center of the loudspeakers of the vehicle according to the individual wishes of the driver or any passengers. If the driver now wants to make a phone call or a phone call is made to the telephone unit, it is desirable that the driver is not forced to set the amplification factors of the amplification channels each time during a call so that no acoustic feedback occurs during telephone operation. Rather, it is desirable that the sound center of the speakers in the telephone mode is automatically moved to a fixed, but predetermined point of the interior of the vehicle. This is possible, for example, using an EEPROM.
  • the optimum sound center of the loudspeakers for telephone operation can be determined and determined by programming the EEPROM. This makes it possible to optimally adapt the sound center to any vehicle type. Furthermore, it is conceivable that a software program is implemented in the audio device, which enables an operator to individually set the amplification factors of the amplification channels and thus the sound center of the loudspeakers for the operation of the telephone unit by means of a corresponding operating unit. Are the gain factors of the gain channels for operation Once the telephone unit is set, the audio device automatically switches to these amplification factors when activated by the telephone unit, and feedback-free telephone operation is guaranteed.
  • a further advantageous embodiment of the invention is characterized in that the audio device switches the frequency response of the amplification channels as a function of the signal source driving the audio device.
  • the audio device 1 shows a block diagram of an audio device 1.
  • the audio device 1 has an amplifier 2 with a first amplification channel 3, a second gain channel 4, a third gain channel 5 and a fourth gain channel 6.
  • the first gain channel has a gain factor V 1
  • the second gain channel 4 has a gain factor V 2
  • the third gain channel 5 has a gain factor V 3
  • the fourth gain channel 6 has a gain factor V 4 .
  • a first loudspeaker 7, a second loudspeaker 8, a third loudspeaker 9 and a fourth loudspeaker 10 are connected to the audio device 1.
  • the reinforcing channels 3 to 6 provide the gain factors V 1 to V 4 amplified output signals S 1 to S. 4
  • These amplified output signals S 1 to S 4 of the amplifier unit 2 control the loudspeakers 7 to 10.
  • a tuner 11, a magnetic tape cassette device 12 and a CD player 13 are provided as the first signal sources, and a telephone unit 14 is provided as the second signal source.
  • the amplifier 2 is coupled on the input side to the tuner 11, the magnetic tape cassette device 12, the CD player unit 13 and the telephone unit 14.
  • the telephone unit 14 has an antenna 15 and a hands-free microphone 16.
  • the audio device 1 has a control unit 17, which is bidirectionally coupled to the amplifier 2, the tuner 11, the magnetic tape cassette device 12, the CD player 13 and the telephone unit 14.
  • This control unit 17 can be implemented, for example, by means of a microprocessor.
  • the gain factors V 1 to V 4 of the amplifier 2 can be set individually by means of the control unit 17.
  • control unit 17 controls which of the signal sources (tuner 11, magnetic tape cassette device 12, CD player 13 or telephone unit 14) control the amplifier 2.
  • the control unit 17 is coupled to an operating / display unit 18.
  • operating information can be transmitted to the control unit 17 by an operator, who can forward the control unit 17 to control the amplifier 2, tuner 11, magnetic tape cassette device 12, CD player 13 and telephone unit 14.
  • information can be visually transmitted to the operator on the operating / display unit 18 are, for example information about received stations, titles of the CD player 19 or the like.
  • the four loudspeakers are essentially installed at the four corners of the interior of a vehicle. If the audio device is controlled by one of the first signal sources (tuner 11, magnetic tape cassette device 12 or CD player unit 13) with an audio signal, the amplification factors V 1 to V 4 of the amplification channels 3 to 6 of the amplifier 2 can be controlled by means of the control / display unit 18 and the control unit 17 can be set individually by an operator. If the driver of the vehicle drives alone, he will preferably set the amplification factors V 1 to V 4 of the amplification channels 3 to 6 such that the sound center of the loudspeakers 7 to 10 is close to the position of the driver.
  • the driver or the operator will set the amplification factors V 1 to V 4 so that the sound center of the loudspeakers 7 to 10 is in the middle of the interior of the vehicle, so that all four Occupants can clearly perceive the audio signal.
  • the driver will preferably make this setting of the amplification factors V 1 to V 4 when starting the journey. If the driver of the vehicle now wishes to make phone calls, he can transmit this to the control unit 17 by means of the operating / display unit 18. If the telephone unit 14 receives a telephone call, this is automatically recognized by the control unit 17.
  • the audio device is now switched to telephone operation by means of the control unit 17, that is to say the voice signal received by the antenna 15 of the telephone unit 14 is fed to the amplifier 2, amplified by means of the amplification channels 3 to 6 with the amplification factors V 1 to V 4 and by means of the Speakers 7 to 10 acoustically transmitted to the operator.
  • the sound center of the loudspeakers 7 to 10 is automatically switched to a fixed, predefinable sound center by switching the amplification factors V 1 to V 4 of the amplification channels 3 to 6.
  • the fixed, predeterminable sound center of the loudspeakers 7 to 10 in the telephone mode is generally set so that the sound center is sufficiently far from the hands-free microphone 16 so that an acoustic feedback between the driver's speech signal and that of the loudspeakers 7 to 10 reproduced voice signal of the partner calling the driver is avoided.
  • the amplification factors V 1 to V 4 the sound center for telephone operation can be shifted to any location in the interior of the vehicle and thus to the acoustic conditions of the interior of the respective vehicle type and to the specific wishes and needs of the driver or operator be adjusted.
  • the setting of the amplification factors V 1 to V 4 to which the amplifier 2 switches when activated by means of the voice signal from the telephone unit 14, can be carried out by the operator, for example, when the audio device 1 is started up.
  • the amplification factors are stored in an EEPROM 19, to which the control unit 17 has access.
  • a software program is implemented in the control unit 17, which allows an operator to set the amplification factors V 1 to V 4 , to which the audio device 1 switches over in telephone mode, by means of the operating / display unit 18.
  • Such a setting of the gain factors V 1 to V 4 by means of the operating / display unit 18 is particularly user-friendly and can be changed by the operator at any time as desired.
  • the period of time during which the gain factors V 1 to V 4 are switched over can be set according to the acoustic peculiarities of the vehicle type and the individual wishes and needs of the operator by means of the EEPROM 19 or by means of the software program implemented in the control unit 17.
  • the audio device 1 is also controlled by other signal sources, such as a television unit or a navigation system. It is also possible that the amplifier 2 has more than four amplification channels and can control more than four loudspeakers. It is also possible to implement the tuner 11, the magnetic tape cassette device 12, the CD player unit 13 and the telephone unit 14 individually or together in the audio device 1. Furthermore, it is also possible to implement the control unit 17 and the amplifier 2 as individual devices. In addition, it is conceivable that the amplifier 2 is a preamplifier that controls a final amplifier, which in turn controls the speakers 7 to 10. The selected division of audio device 1 with amplifier 2 and control unit 17 and the connected individual modules tuner 11, magnetic tape cassette device 12, CD player 13 and telephone unit 14 is only to be regarded as an example.
  • the amplifier 2 can then e.g. Realize temporal filters by means of which unwanted echoes can be filtered out.
  • FIG. 2 shows a schematically illustrated sketch of an interior 20 of a vehicle, not shown in any more detail.
  • the loudspeaker 8 according to FIG. 1 is positioned in the left front corner of the interior 20, the loudspeaker 9 in the front right corner, the loudspeaker 7 in the rear left corner and the loudspeaker 10 in the rear right corner according to FIG. 1.
  • the driver's seat 21 is shown schematically as a rectangle and the driver's head 22 is shown schematically as a circle.
  • the hands-free microphone 16 of the telephone unit 14 according to FIG. 1 is positioned in the left front area of the vehicle interior 20 in the vicinity of the driver's seat 21.
  • a first sound center 23 is shown as an example, which is preferably selected for four vehicle occupants for audio operation of one of the audio signal sources according to FIG. 1 (tuner 11, magnetic tape cassette device 12, CD player unit 13). If the audio device is now controlled by the telephone unit 14 according to FIG. 1 for telephone operation, the amplification factors of the amplification channels of the amplifier 2 according to FIG. 1 are switched and the sound center of the loudspeakers 7, 8, 9 and 10 thereby shifted.
  • the area 27 shown hatched in FIG. 2 shows possible positions of sound centers for telephone operation, which ensure good acoustic decoupling from the hands-free microphone 16.
  • arrows 24a, 25a and 26a show the displacement path from the sound center 23 for audio operation to the possible sound centers 24, 25 and 26 for telephone operation.
  • the stepped formation of the arrow 24a is intended to indicate that the displacement of the sound center 23 to the sound center 24 preferably takes place continuously during a predeterminable period of time, so that a gradual, smooth transition between the sound center 23 and the Sound center 24 takes place.
  • the exemplary sound centers 24, 25 and 26 can be set by the operator, for example using an EEPROM or using a software program.
  • the car audio device With the car audio device according to the invention, it is possible to use all the loudspeakers installed in a vehicle for the reproduction of voice signals from a car telephone unit.
  • the sound center of the loudspeakers for telephone operation can be individually preset and is automatically switched to the preset position in telephone operation.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic Arrangements (AREA)
EP97201495A 1996-05-24 1997-05-16 Dispositif audio pour une voiture Withdrawn EP0809413A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19620980 1996-05-24
DE1996120980 DE19620980A1 (de) 1996-05-24 1996-05-24 Audiogerät für ein Fahrzeug

Publications (1)

Publication Number Publication Date
EP0809413A1 true EP0809413A1 (fr) 1997-11-26

Family

ID=7795235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97201495A Withdrawn EP0809413A1 (fr) 1996-05-24 1997-05-16 Dispositif audio pour une voiture

Country Status (5)

Country Link
EP (1) EP0809413A1 (fr)
JP (1) JPH1066189A (fr)
KR (1) KR970078736A (fr)
CN (1) CN1167419A (fr)
DE (1) DE19620980A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1089447A2 (fr) * 1999-09-28 2001-04-04 Robert Bosch Gmbh Procédé de reproduction du signal audio d'un téléphone mobile avec un autoradio et dispositif mains-libres associé
EP1860918A1 (fr) * 2006-05-23 2007-11-28 Harman/Becker Automotive Systems GmbH Système de communication et méthode pour contrôler la restitution d'un signal audio
WO2008137251A1 (fr) * 2007-05-04 2008-11-13 Bose Corporation Diffusion directionnelle du son dans un véhicule
US8045743B2 (en) 2005-09-12 2011-10-25 Bose Corporation Seat electroacoustical transducing
US8325936B2 (en) 2007-05-04 2012-12-04 Bose Corporation Directionally radiating sound in a vehicle
US8483413B2 (en) 2007-05-04 2013-07-09 Bose Corporation System and method for directionally radiating sound
US8724827B2 (en) 2007-05-04 2014-05-13 Bose Corporation System and method for directionally radiating sound
US9100749B2 (en) 2007-05-04 2015-08-04 Bose Corporation System and method for directionally radiating sound

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19742797C1 (de) * 1997-09-27 1999-04-22 Grundig Ag Kraftfahrzeugkommunikationsvorrichtung
JP3042681B2 (ja) * 1998-04-15 2000-05-15 怡利電子工業股▲ひん▼有限公司 自動車音響装置のスピーカと結合した携帯電話握持不要受話器
DE19942858C2 (de) * 1999-09-08 2003-04-03 Am3 Automotive Multimedia Ag Sitzplatzbezogene Beschallungseinrichtung
DE19958836A1 (de) 1999-11-29 2001-05-31 Deutsche Telekom Ag Verfahren und Anordnung zur Verbesserung der Kommunikation in einem Fahrzeug
JP4330302B2 (ja) 2001-09-27 2009-09-16 日産自動車株式会社 音声入出力装置
KR100410768B1 (ko) * 2001-10-11 2003-12-18 현대자동차주식회사 핸즈프리시스템의 통화자 인지형 신호 스위칭 장치
CA2498392C (fr) * 2003-01-23 2014-06-17 Harman Becker Automotive Systems Gmbh Systeme audio a reglage de balance base sur les adresses d'informations
JP2005191668A (ja) * 2003-12-24 2005-07-14 Pioneer Electronic Corp 発音制御装置、その方法、そのプログラム、および、そのプログラムを記録した記録媒体
JP4913120B2 (ja) * 2008-12-22 2012-04-11 ハーマン ベッカー オートモーティブ システムズ ゲーエムベーハー 情報アドレスに基づくバランス設定を有するオーディオシステム
DE102016205184A1 (de) * 2016-03-30 2017-10-05 Siemens Aktiengesellschaft Verfahren und Anordnung zum Steuern einer Ausgabelautstärke wenigstens einer akustischen Ausgabeeinrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5947900A (ja) * 1982-09-10 1984-03-17 Fujitsu Ten Ltd バランスフエ−ダ回路
WO1990009706A1 (fr) * 1989-02-14 1990-08-23 In-Car Systems Limited Appareil telephonique pour vehicule
EP0387516A2 (fr) * 1989-02-06 1990-09-19 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG Combinaison d'un autoradio avec d'autres moyens de communication
EP0503154A2 (fr) * 1991-03-14 1992-09-16 Pioneer Electronic Corporation Récepteur RDS
JPH06296158A (ja) * 1993-04-07 1994-10-21 Clarion Co Ltd 車載オーディオ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5947900A (ja) * 1982-09-10 1984-03-17 Fujitsu Ten Ltd バランスフエ−ダ回路
EP0387516A2 (fr) * 1989-02-06 1990-09-19 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG Combinaison d'un autoradio avec d'autres moyens de communication
WO1990009706A1 (fr) * 1989-02-14 1990-08-23 In-Car Systems Limited Appareil telephonique pour vehicule
EP0503154A2 (fr) * 1991-03-14 1992-09-16 Pioneer Electronic Corporation Récepteur RDS
JPH06296158A (ja) * 1993-04-07 1994-10-21 Clarion Co Ltd 車載オーディオ装置

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* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 139 (E - 253) 28 June 1984 (1984-06-28) *
PATENT ABSTRACTS OF JAPAN vol. 095, no. 001 28 February 1995 (1995-02-28) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1089447A2 (fr) * 1999-09-28 2001-04-04 Robert Bosch Gmbh Procédé de reproduction du signal audio d'un téléphone mobile avec un autoradio et dispositif mains-libres associé
EP1089447A3 (fr) * 1999-09-28 2004-03-03 Robert Bosch Gmbh Procédé de reproduction du signal audio d'un téléphone mobile avec un autoradio et dispositif mains-libres associé
US8045743B2 (en) 2005-09-12 2011-10-25 Bose Corporation Seat electroacoustical transducing
EP1860918A1 (fr) * 2006-05-23 2007-11-28 Harman/Becker Automotive Systems GmbH Système de communication et méthode pour contrôler la restitution d'un signal audio
US8019454B2 (en) 2006-05-23 2011-09-13 Harman Becker Automotive Systems Gmbh Audio processing system
WO2008137251A1 (fr) * 2007-05-04 2008-11-13 Bose Corporation Diffusion directionnelle du son dans un véhicule
US8325936B2 (en) 2007-05-04 2012-12-04 Bose Corporation Directionally radiating sound in a vehicle
US8483413B2 (en) 2007-05-04 2013-07-09 Bose Corporation System and method for directionally radiating sound
US8724827B2 (en) 2007-05-04 2014-05-13 Bose Corporation System and method for directionally radiating sound
US9100749B2 (en) 2007-05-04 2015-08-04 Bose Corporation System and method for directionally radiating sound
US9100748B2 (en) 2007-05-04 2015-08-04 Bose Corporation System and method for directionally radiating sound

Also Published As

Publication number Publication date
KR970078736A (ko) 1997-12-12
DE19620980A1 (de) 1997-11-27
CN1167419A (zh) 1997-12-10
JPH1066189A (ja) 1998-03-06

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