WO2004049755A1 - Akustische schallführung im fahrzeug - Google Patents
Akustische schallführung im fahrzeug Download PDFInfo
- Publication number
- WO2004049755A1 WO2004049755A1 PCT/EP2003/012989 EP0312989W WO2004049755A1 WO 2004049755 A1 WO2004049755 A1 WO 2004049755A1 EP 0312989 W EP0312989 W EP 0312989W WO 2004049755 A1 WO2004049755 A1 WO 2004049755A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sound
- acoustic
- headrest
- acoustic device
- loudspeaker
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/023—Screens for loudspeakers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/80—Head-rests
- B60N2/879—Head-rests with additional features not related to head-rest positioning, e.g. heating or cooling devices or loudspeakers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/024—Mixtures
- G01N2291/02491—Materials with nonlinear acoustic properties
-
- 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
Definitions
- the invention relates to an acoustic device for generating audio signals according to the features of the preamble of patent claim 1.
- the audio sound system in today's vehicles should ensure the same high quality in every seat.
- the aim is that all occupants hear practically the same audio signal in the same quality and at the same volume; in complex systems also with stereo or surround effect.
- the volume can be roughly balanced, between "right” and “left” and between "front” and “back”.
- Techniques are known which aim at the separation of the audio output in order to be able to present very different audio programs to spatially neighboring people.
- WO 01/08449 AI describes a method for reproducing audio sound with ultrasound loudspeakers, in which the audio signal to be reproduced is linked by amplitude modulation to a carrier signal in the ultrasound frequency range.
- Such techniques are used to concentrate sound using a modulated ultrasound signal.
- the audible audio sound is generated along the ultrasound beam emitted at a very high level due to the nonlinearity of the air and added up sharply.
- One possibility of generating audio directly in the headrest of a vehicle seat is shown, for example, in patent application EP 1 077 156 AI.
- the loudspeaker is integrated in the headrest. Sound is emitted through an integrated, horn-shaped resonator that connects to the loudspeaker.
- a further possibility of audio generation in the headrest with directional effect is described in the document EP 1 077 583 A2.
- the directionality is generated in that the sound emitted in the direction of the back of the headrest is also used by the loudspeaker integrated in the headrest.
- the general benefit of audio sound as a near field in the head area is that the person in the immediate vicinity is well sounded and people a little further away are sounded at a significantly reduced volume.
- the sound reinforcement on the headrest provides a good opportunity to achieve spatial audio effects such as stereo.
- a disadvantage of these arrangements in which the loudspeaker of the acoustic system is located directly in the headrest and, above all, is the reduced safety against accidents, since relatively large hard objects are integrated in the otherwise soft headrest, which lead to head injuries could. Furthermore, the integration of relatively large-volume loudspeakers severely limits the optical design options for the headrest.
- JP 04 172 795 A describes an acoustic device in which the sound transducer and the sound exit location are spatially separated from one another.
- the sound is conducted between the transducer and the sound exit point through a tubular sound line.
- a horn-shaped line termination is proposed for acoustic impedance matching of the air within the sound line to the environment.
- the line termination to dampen flexions preferably created by a suitable shaping of sound-absorbing material.
- Patent DE 589 19 495 T2 describes a similar system with sound conduction between the sound transducer and the sound exit location, the acoustic impedance matching being achieved by attaching ring members to the sound exit opening.
- the material from which these ring members are made has a permeability corresponding to the air.
- the additional application of the ring links leads to an increase in the dimensions of the outlet openings of the sound line.
- the object of the invention is to provide an acoustic device which, on the one hand, has no large-volume hard components in the vicinity of its sound exit location and, on the other hand, has the best possible adaptation of the acoustic impedance between the air column generated by a sound transducer and the ambient air.
- the solution to the problem consists in the inventive design of an acoustic device for generating audio signals, in which the sound transducer and at least one sound exit location are spatially separated from one another.
- Such devices have an air-guiding sound line which is connected to the sound exit point and in which a means is provided in order to achieve an acoustic impedance matching of the air in the sound line and the ambient air in order to reduce resonance effects.
- the means for acoustic resonance adaptation consists of a measure material that has the acoustic impedance of air. In an inventive manner, this material is now applied flatly and coherently over the at least one sound outlet opening. In this way, an acoustic impedance matching is achieved, which not only requires the smallest possible installation space, but which at the same time also offers protection against the entry of dirt into the device.
- the material having the acoustic impedance of air consists of a fibrous and / or porous material, in particular of felt, sponge material, non-woven material or felt metal. Since the acoustic impedance of air is 41.4 Rayl, the material used to terminate the sound conduction should also have a Rayl value of this magnitude. In the trade, for example, materials known as felt metal with corresponding Rayl values are readily available. The closure of the pipe ends with material that has a value of approximately 40 Rayl simulates an infinitely long pipe and thus leads to an ideal, resonance-free .Sound emission. - .. In a particularly advantageous manner, the thickness of the Feit metal used should be of the order of magnitude of 1 mm, so that on the one hand there is sufficient shock and pressure resistance and on the other hand there is as little damping of the sound waves as possible.
- Figure 1 shows the influences existing within a motor vehicle on the propagation of acoustic sound waves.
- Figure 2 shows a laboratory setup of an acoustically ⁇ schematically the inventive device.
- FIG. 3 shows the frequency spectrum measured using the laboratory setup shown in FIG. 2.
- FIG. 4 shows an example of a sound transducer in the form of an isobaric push / pull system.
- Figure 5 outlines an alternative design of an isobaric push / pull system.
- FIG. 6 shows a laboratory setup for determining the directivity of an acoustic device whose sound converter works on the basis of a push / pull system.
- FIG. 7 shows the frequency spectrum measured by means of the laboratory setup shown in FIG. 6.
- Figure 8 shows an example of a headrest according to the invention with sound guidance through the support rods.
- FIG. 9 shows an example of a headrest, in which a directional effect of the emitted sound occurs through suitable execution of the sound guidance.
- FIG. 10 shows an example of a headrest in which the sound exit locations of the device according to the invention are arranged in relation to a surface radiator.
- FIG. 11 shows an example of a headrest in which a directional effect of the emerging sound is achieved, both by canceling it in phase opposition and by arranging the sound exit locations to form a surface loudspeaker.
- Figure la shows schematically the interior of a motor vehicle with two individual seats, driver and front passenger seats, and a seat in the rear. Within such a typical vehicle interior, the spread of the loudspeaker signal emitted by a center above the backrest of the seat was measured.
- Figure lb) shows the power drop of the speaker signal as a function of distance.
- Curve 11 shows the drop in power in the direction 10 of the driver and front passenger seat and curve 13 shows the drop in power in the direction 12 of the passengers in the back seat at an angle of 45 ° from the loudspeaker.
- the ⁇ dB value is the correct value if we are in the direct sound field of the sources. This is approximately fulfilled in the vehicle up to the measured distance of 80 cm.
- An ideal diffuse sound field e.g. due to a lot of reflections
- would not have a " location-dependent-r -Da we - in the vehicle - achieve this 6dB value" it makes sense to place the sound source directly at the user, i.e.
- the user is at a distance of 5cm from the sound source and the next listener is at a distance of 40cm.This means that the sound power is 18dB lower for the listener that the reduction in listening in results from the distance dependence in the direct, near sound field.
- FIG. 2 shows the laboratory setup of an arrangement consisting of a pressure chamber loudspeaker and a thin-walled plastic tube connected to it.
- the plastic tube 20 has an inner diameter of 15mm and is 1 meter long.
- the one in Loudspeaker 21 used in the laboratory system is a measurement loudspeaker from B&K.
- the pressure chamber loudspeaker consists of a loudspeaker chassis in a small pressure-resistant housing.
- the volume of air on the front of the diaphragm 22 of the loudspeaker up to the raw batch is very small.
- a measuring microphone 23 was placed at a distance of approximately 10 cm vertically in front of the pipe opening. This arrangement was designed to carry out measurements in an acoustically damped room.
- FIG. 3 shows two frequency response measurements that were carried out using the laboratory setup shown in FIG. 2.
- Curve A represents the measurement curve as it results from operating the structure without covering the sound line. Curve A shows clear resonances at 170, 340, 510, 680, .... Hz. The resonances arise at the frequencies at which the wavelength is twice the tube length (and integral fractions thereof).
- the .Curve .. B_ describes .that. , Frequency behavior of the structure when the sound conduction is terminated according to the invention with a Felt metal 24 with 35 Rayl.
- the resonances are reduced by approx. 10dB and thus approximately an even (linear) frequency response is created.
- FIG. 4a schematically shows a sound transducer consisting of 2 tubes 40 and 41, a housing 42 and two identical loudspeaker chassis 43 and 44.
- the installation of the two chassis 43 and 44 in the housing 42 corresponds to an isobaric push / pull system.
- the push / pull function is achieved in that the two chassis are electrically connected in phase opposition, so that the membrane movements are opposite.
- the air volume between the front of the membrane and the raw batch is very low. In the box there is practically always the same constant pressure and in the tubes there is an oscillating, opposite phase pressure.
- FIG. 5 outlines an alternative design 50 of an isobaric push / pull system, which has the advantage that it uses the dipole characteristic of a single loudspeaker chassis 50.
- the loudspeaker housing is divided into two chambers 51 and 52, each of which is assigned to the membrane front side 53 and the membrane rear side 54. This always results in two chambers, a phase-opposed pressure, which we differentiate with "+" and "-”.
- the design is simpler and only one loudspeaker blocking chassis is required.
- setting the same acoustic conditions at the pipe ends can be more difficult here, since the loudspeaker chassis itself is asymmetrical and, under certain circumstances, there may be acoustically different conditions at the beginning of the pipe.
- FIG. 6 schematically shows the laboratory setup for measuring an isobaric push / pull system 60 with an acoustic closure of the pipe ends.
- one of the pipes additionally contains insulating material 61 in order to reduce the sound emerging from this pipe over a broad band.
- fibrous insulation material In the present example, the sound emission was reduced by approximately 3dB broadband.
- the useful sound source is to be designated with "+", "-" denotes the compensation-phase compensation sound source.
- the loudspeaker chassis used here are simple systems that are used for inexpensive products, such as television sets.
- the housing has not been acoustically optimized. With this system, the broadband directivity can be shown as an example.
- FIG. 7 shows the frequency responses with the microphones M1, M2 and M3.
- Ml and M2 There is an almost congruent frequency response for Ml and M2 in the range from 70Hz to 2kHz.
- the spatial area around M1 and M2 is the useful area, the ear of the listener should be located here.
- M3 is the neighboring area that should be sonicated as little as possible. Due to the anti-phase sound reduced by 3dB, there is a partial cancellation, so that broadband lOdB there is less sound ... ⁇
- the "achbar range _ where the acoustic signal should be transmitted as little as possible was chosen in the example above by the choice of Attenuation of 3dB set with an insulating material 61.
- the neighboring area should be at a greater distance from the usable area, this can be set using two measures.
- the spatial distance of the pipe openings (in the example above 8cm) is increased or the 3dB attenuation value is reduced, for example to 1 to 2dB.
- the measurement results shown in FIG. 7 are of course only exemplary and it goes without saying that by means of suitable acoustic optimization of the signal emitted by the sound transducers, an even frequency response and a wider bandwidth can be achieved with the same acoustic device.
- ne common crossover the possibility of influencing the transmitted frequency component by insulating materials in the pipe and various raw diameters.
- the experiment can be optimized experimentally. Should e.g. in a car, the listening from the driver's headrest to the front passenger is reduced, so the rear area will be about 50cm away from the useful area. The exact determination of the damping value and the pipe distance also depends on the design of the headrest. Experimental optimization in the vehicle is recommended.
- Figure 8 shows an example of an acoustic headrest 80 with sound guidance.
- the support bracket 81 Through the support bracket 81, the sound is guided into the headrest.
- the support bracket 81 is designed as a tube, from the end of the support bracket 81 another tube element 82 finally leads to the opening.
- the openings are in the immediate vicinity of the listener's ears.
- the second holding support 83 of the headrest is designed as a tubular sound conductor with further tubular elements. Both pipe systems can then either receive the same signal from a loudspeaker system or different signals to generate stereophony, for example.
- a pressure chamber system for example, can be used as the sound transducer in such a system.
- Figure 9 shows an acoustic headrest 90, an opening 91 being provided on the back of the headrest for the antiphase signal. Only the arrangement for one side of the headrest is shown here, i.e. only for one ear. The ear of the listener should be reached by the sound labeled "+”. In the lateral direction or backwards, the listener should be partially compensated with the "-" Sound. It is advantageous to choose the tube lengths for the "+" and "-" sound of the same length in order to obtain frequency responses of the same type. An isobaric push / pull system can advantageously be used as the loudspeaker.
- An alternative to creating directivity is to use several pipes with the same sound component and to arrange the openings of these pipes in one area. In a way, this area contains many acoustic point sources.
- the sources in the surface simulate a large radiating surface. Radiating surfaces show a clear directivity when the extent of the surface reaches the order of magnitude of the acoustic wavelength. " If the area is larger than the wavelength, the runtime differences between the sources are large, and the resulting directivity is particularly strong.
- Figure 10 shows a simple example of a headrest - OO - where -3 tube ends -101., -. 10.2._ and_ 103 . contribute to sound generation and directivity.
- the same length of the pipelines 101, 102 and 103 used is advantageous in order to obtain the same acoustic properties.
- Pipelines running in parallel or a branched pipeline can be used.
- the three sound sources 104 are arranged one above the other.
- the arrangement of sound sources on top of each other is known from the hall sound system with column loudspeakers. This achieves a horizontal directivity of the arrangement and reduces the sound radiation to the ceiling (and to the floor) (horizontal bundling).
- the horizontal one Bundling also achieved vertical bundling.
- the possible arrangement of sound sources on a headrest is limited by the small area.
- a 10 cm wavelength corresponds to a frequency of 3.4 kHz.
- a clear directivity sets in with a source extension of about a quarter of the wavelength.
- a source extension of 10cm is effective from wavelengths of 40cm (and less). 40cm roughly correspond to 1kHz.
- the procedure shown with several pipe openings is effective from about 1kHz in terms of increased directivity. The combination of directivity through several in-phase pipe ends and through directivity with opposite phase raw ends is possible.
- FIG. 11 shows an example of a headrest 110 which has the combination of two directivity components.
- medium frequencies e.g. From 1 kHz the multiple tube ends 1-11 act on the front side. -The .Stütze_als_ directional spotlight to the ear.
- a tube end 112 with out-of-phase sound to cancel out side and rear sound is mainly effective for frequencies below 1kHz.
- Multi-way systems are known in loudspeaker construction. They require a so-called crossover to control the individual chassis with the signal components intended for them.
- the use of the acoustic device according to the invention is not limited to use in a headrest but can be used profitably above all where there is limited installation space for the integration of acoustic sound sources or in which the integration of conventional sound transducers for safety reasons is not seems necessary.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50302678T DE50302678D1 (de) | 2002-11-28 | 2003-11-20 | Akustische schallführung im fahrzeug |
US10/535,147 US7508952B2 (en) | 2002-11-28 | 2003-11-20 | Acoustic sound routing in vehicles |
AU2003283418A AU2003283418A1 (en) | 2002-11-28 | 2003-11-20 | Acoustic wave guidance in a vehicle |
JP2004554399A JP4264068B2 (ja) | 2002-11-28 | 2003-11-20 | 車両内における音響波誘導 |
EP03775376A EP1566073B1 (de) | 2002-11-28 | 2003-11-20 | Akustische schallführung im fahrzeug |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10255794.2 | 2002-11-28 | ||
DE10255794A DE10255794B3 (de) | 2002-11-28 | 2002-11-28 | Akustische Schallführung im Fahrzeug |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004049755A1 true WO2004049755A1 (de) | 2004-06-10 |
Family
ID=32335847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/012989 WO2004049755A1 (de) | 2002-11-28 | 2003-11-20 | Akustische schallführung im fahrzeug |
Country Status (6)
Country | Link |
---|---|
US (1) | US7508952B2 (de) |
EP (1) | EP1566073B1 (de) |
JP (1) | JP4264068B2 (de) |
AU (1) | AU2003283418A1 (de) |
DE (2) | DE10255794B3 (de) |
WO (1) | WO2004049755A1 (de) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1763281A2 (de) | 2005-09-12 | 2007-03-14 | Bose Corporation | Elektroakustischer Wandler für einen Sitz |
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 |
US9100748B2 (en) | 2007-05-04 | 2015-08-04 | Bose Corporation | System and method for directionally radiating sound |
US9560448B2 (en) | 2007-05-04 | 2017-01-31 | Bose Corporation | System and method for directionally radiating sound |
CN110870326A (zh) * | 2017-07-12 | 2020-03-06 | 伯斯有限公司 | 音频设备 |
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---|---|---|---|---|
JP2005159412A (ja) * | 2003-11-20 | 2005-06-16 | Pioneer Electronic Corp | 座席用スピーカユニット |
JP5113471B2 (ja) * | 2007-10-02 | 2013-01-09 | S′Next株式会社 | スピーカシステム |
US7861821B2 (en) * | 2007-11-17 | 2011-01-04 | Connor Robert A | Acoustically transmissive blanket system |
RU2504110C2 (ru) * | 2012-06-19 | 2014-01-10 | Зао "Нтк" | Акустическая система |
US9088842B2 (en) | 2013-03-13 | 2015-07-21 | Bose Corporation | Grille for electroacoustic transducer |
US9327628B2 (en) | 2013-05-31 | 2016-05-03 | Bose Corporation | Automobile headrest |
US10124772B1 (en) | 2013-10-18 | 2018-11-13 | Todd James Hartman | Systems, methods, and apparatus for debris removal |
US9699537B2 (en) | 2014-01-14 | 2017-07-04 | Bose Corporation | Vehicle headrest with speakers |
WO2016055687A1 (en) | 2014-10-06 | 2016-04-14 | Genelec Oy | Loudspeaker with a waveguide |
KR101830246B1 (ko) * | 2016-08-09 | 2018-03-29 | 주식회사 이엠텍 | 넥밴드형 무선 음향 변환 장치 |
US10397681B2 (en) | 2016-12-11 | 2019-08-27 | Base Corporation | Acoustic transducer |
WO2019180626A1 (en) * | 2018-03-21 | 2019-09-26 | Lazy Design Private Limited | Wearable communication device |
GB201805523D0 (en) * | 2018-04-04 | 2018-05-16 | Pss Belgium Nv | Loudspeaker unit |
WO2019192816A1 (en) * | 2018-04-04 | 2019-10-10 | Pss Belgium Nv | Loudspeaker unit |
DE102018115294A1 (de) * | 2018-06-26 | 2020-01-02 | Faurecia Autositze Gmbh | Rückenlehne für einen Sitz, insbesondere Fahrzeugsitz, sowie Sitz |
US11295718B2 (en) | 2018-11-02 | 2022-04-05 | Bose Corporation | Ambient volume control in open audio device |
CN109547906B (zh) * | 2019-01-05 | 2023-12-08 | 深圳市韶音科技有限公司 | 骨传导扬声装置 |
WO2021071496A1 (en) * | 2019-10-10 | 2021-04-15 | Harman International Industries, Incorporated | Side-firing headrest loudspeaker with omnidirectional lens |
CN110830867B (zh) * | 2019-11-01 | 2021-09-17 | 歌尔股份有限公司 | 一种智能头戴设备 |
CN110856067B (zh) * | 2019-11-01 | 2022-03-18 | 歌尔股份有限公司 | 一种智能头戴设备 |
US20230179913A1 (en) * | 2020-03-26 | 2023-06-08 | Nippon Telegraph And Telephone Corporation | Loudspeaker system |
JPWO2022091256A1 (de) * | 2020-10-28 | 2022-05-05 | ||
WO2022091255A1 (ja) * | 2020-10-28 | 2022-05-05 | 日本電信電話株式会社 | 音響システム |
JPWO2022091254A1 (de) * | 2020-10-28 | 2022-05-05 |
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2002
- 2002-11-28 DE DE10255794A patent/DE10255794B3/de not_active Expired - Fee Related
-
2003
- 2003-11-20 WO PCT/EP2003/012989 patent/WO2004049755A1/de active IP Right Grant
- 2003-11-20 US US10/535,147 patent/US7508952B2/en not_active Expired - Fee Related
- 2003-11-20 AU AU2003283418A patent/AU2003283418A1/en not_active Abandoned
- 2003-11-20 JP JP2004554399A patent/JP4264068B2/ja not_active Expired - Fee Related
- 2003-11-20 DE DE50302678T patent/DE50302678D1/de not_active Expired - Lifetime
- 2003-11-20 EP EP03775376A patent/EP1566073B1/de not_active Expired - Fee Related
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1763281A2 (de) | 2005-09-12 | 2007-03-14 | Bose Corporation | Elektroakustischer Wandler für einen Sitz |
EP1763281A3 (de) * | 2005-09-12 | 2008-02-13 | Bose Corporation | Elektroakustischer Wandler für einen Sitz |
US7688992B2 (en) | 2005-09-12 | 2010-03-30 | Richard Aylward | Seat electroacoustical transducing |
US8045743B2 (en) | 2005-09-12 | 2011-10-25 | Bose Corporation | Seat electroacoustical transducing |
CN1933675B (zh) * | 2005-09-12 | 2012-04-25 | 伯斯有限公司 | 座位电声转换 |
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 |
US9100748B2 (en) | 2007-05-04 | 2015-08-04 | 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 |
US9560448B2 (en) | 2007-05-04 | 2017-01-31 | Bose Corporation | System and method for directionally radiating sound |
CN110870326A (zh) * | 2017-07-12 | 2020-03-06 | 伯斯有限公司 | 音频设备 |
CN110870326B (zh) * | 2017-07-12 | 2021-08-27 | 伯斯有限公司 | 音频设备 |
Also Published As
Publication number | Publication date |
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DE50302678D1 (de) | 2006-05-11 |
JP4264068B2 (ja) | 2009-05-13 |
EP1566073A1 (de) | 2005-08-24 |
DE10255794B3 (de) | 2004-09-02 |
AU2003283418A1 (en) | 2004-06-18 |
EP1566073B1 (de) | 2006-03-15 |
JP2006508573A (ja) | 2006-03-09 |
US20060056650A1 (en) | 2006-03-16 |
US7508952B2 (en) | 2009-03-24 |
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