EP3051838A1 - Lautsprecheranordnungspositionierung im wagen - Google Patents

Lautsprecheranordnungspositionierung im wagen Download PDF

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Publication number
EP3051838A1
EP3051838A1 EP15165463.9A EP15165463A EP3051838A1 EP 3051838 A1 EP3051838 A1 EP 3051838A1 EP 15165463 A EP15165463 A EP 15165463A EP 3051838 A1 EP3051838 A1 EP 3051838A1
Authority
EP
European Patent Office
Prior art keywords
sun visor
spatial audio
audio transducer
array
transducer system
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Withdrawn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
EP15165463.9A
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English (en)
French (fr)
Inventor
Martin Schneider
Sebastian Scharrer
Andreas Walther
Oliver Hellmuth
Emanuel Habets
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Friedrich Alexander Univeritaet Erlangen Nuernberg FAU
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Friedrich Alexander Univeritaet Erlangen Nuernberg FAU
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV, Friedrich Alexander Univeritaet Erlangen Nuernberg FAU filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority to EP15165463.9A priority Critical patent/EP3051838A1/de
Priority to PCT/EP2016/051924 priority patent/WO2016120451A1/en
Publication of EP3051838A1 publication Critical patent/EP3051838A1/de
Withdrawn legal-status Critical Current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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • 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

  • Embodiments of the present invention refer to a spatial audio transducer system and a positioning thereof, especially a positioning inside a vehicle.
  • the loudspeakers in a vehicle are typically positioned in the doors, the dashboard or the back shelf.
  • a further very common position is the A pillar, especially for tweeters.
  • the positions in the front of a passenger vehicle are limited. These limitations appear especially in the case if loudspeaker arrays for spatial audio reproduction, like spotforming, beamforming, wavefield synthesis reproduction or higher-order ambisonics techniques, should be placed. Due to these placement constraints, these techniques are not broadly used in automotive scenarios. These limitations result in a non-present or non-optional 3D/surround reproduction. This limitation applies to multizone reproduction, too. Therefore, there is the need for an improved approach.
  • An embodiment of the invention provides a spatial audio transducer system.
  • the system comprises a sun visor of a vehicle and a spatial audio transducer array.
  • the array comprises at least three individual audio transducers, wherein the spatial audio transducer array is integrated into the sun visor (e.g. at a main surface of the sun visor facing to the occupants) or into a headlining of the vehicle such that same overlaps at least partially with the sun visor at a closed position of the sun visor.
  • teachings of the invention disclosed herein are based on the knowledge that the area around the sun visor is optimal for positioning spatial audio transducer arrays. This positioning is superior to others due to proximity to the occupants' heads and the location in front of the occupants at the same time. Therefore, it is a basic idea to use a loudspeaker array for audio reproduction in a vehicle, which is located at the position or near to a sun visor.
  • the sun visor provides sufficient space to capture a loudspeaker array effectively for directional audio reproduction.
  • the used arrays combine two advantages, namely that they are capable of reproducing surround sound or multizone sound and that such arrays are flat enough to be arranged within a sun visor or within a headlining in the area of the sun visor.
  • the array may be integrated in the sun visor, wherein the sun visor comprises an opening at an edge, which is opposite to the edge of the joint of the sun visor.
  • the spatial audio transducer array may be integrated into the headlining behind or at least overlapping the sun visor.
  • the sun visor comprises an acoustically transparent material.
  • the spatial audio transducer array is integrated into the joint of the sun visor or integrated into the headlining at the joint of the sun visor.
  • the spatial audio transducer array is arranged at a first main surface of the sun visor facing to the passenger.
  • the sun visor is coupled via one or more rails to the headlining, such that the relative position between the main surface and the passenger does not significantly change in case the sun visor is moved from the closed position to the open position.
  • the sun visor may comprise a second spatial audio transducer array arranged at a second surface facing to the headlining.
  • the first or second array is enabled and disabled dependent on the position of the sun visor (open position or closed position).
  • the sun visor may be coupled to a sun visor sensor which is configured to detect a position of the sun visor.
  • an optional sound processor may process the audio signals for the audio transducers.
  • this processor may perform the switching between the first and the second array or may process the audio signals in order to adapt a frequency response of the audio transducers.
  • the sound processor may comprise one or more filters, wherein the filter coefficients of the filters are adapted dependent on the detected position of the sun visor. In this case, the adaption of the filter coefficients may be dependent on a detected angle of the sun visor.
  • the sun visor sensor may be an angle sensor.
  • the array comprises at least three transducers, which are preferably, but not necessarily, loudspeakers.
  • the transducers or at least one transducer may be a microphone.
  • the arrays may, according to embodiments, or according to further embodiments, be two-dimensional arrays, wherein the single transducers of the arrays are typically controlled independently.
  • Fig. 1 a shows a schematic top view of a vehicle 10 comprising a windshield 12 and two seats 14a and 14b for the two passengers 16a and 16b.
  • two sun visors 18a and 18b are attached to the headlining.
  • the position of the sun visors 18a and 18b which have the property to avoid dazzling of the passengers 16a and 16b caused by the sun, is typically the edge formed by the windshield 12 and the roof of the vehicle 10.
  • sun visors 18a and 18b are coupled to the headlining using a rotatable joint so that the sun visor may be moved from a closed position (in parallel to the headlining) to an open position (in parallel to the windshield 12) or vice versa.
  • the sun visors 18a and 18b are beneficial positions for the loudspeaker arrays 20a and 20b, wherein the loudspeaker array 20a and the purpose to provide a sound field for the passenger 16a and wherein the loudspeaker array 20b has a purpose to provide a sound field for the passenger 16b.
  • the space adjacent to the top end of the windshield 12 is attractive for the placement of transducer arrays 20a and 20b. This is because it is in front of the occupants, it is nearby the occupants' heads and provides a considerable width to place multiple loudspeakers 20a/20b.
  • the loudspeaker arrays 20a and 20b can be implemented either for both or for a single passenger seat 14a/14b.
  • loudspeaker arrays 20a and 20b Due to the positioning of the loudspeaker arrays 20a and 20b, it is possible to implement beamformers that radiate sound predominantly to a desired direction so that multizone reproduction is enabled.
  • a typical usage for such loudspeaker arrays 20a and 20b is spatial audio reproduction, like beamforming / spotforming or wavefield synthesis reproduction and higher-order ambisonics reproduction techniques.
  • loudspeaker arrays are used for such techniques. The basics for the loudspeaker arrays will be discussed with respect to Figs. 1 a and 1 b.
  • loudspeaker array a set of multiple loudspeakers is used as a loudspeaker array, whenever the reproduction system feeds one input signal to multiple loudspeakers that are primarily excited in the same frequency range.
  • An exemplary block diagram of such a setup is shown by Fig. 1b , where the blocks 24a and 24b (denoted with filter) can describe linear or nonlinear, signal-dependent, signal-independent, time-varying, or time-invariant filters that typically differ from each loudspeaker channel (reference numeral 44a and 44b).
  • Figs. 2a to 2c show three views of a spatial audio transducer system 100, wherein the view of Fig. 2a is the view of a passenger to the system 100 in case the sun visor is open and wherein Fig. 2b is the same passenger's view in case the sun visor is closed.
  • Fig. 2c shows a side view of the system 100, wherein the closed position is illustrated by broken lines and the open position illustrated by unbroken lines.
  • the embodiment of Figs. 2a to 2c comprises two/three alternative variants of positioning the array, namely positioning the array within the sun visor according to a first variant and positioning the array within or at the headlining according to a second variant.
  • the spatial audio transducer system 100 comprises the sun visor 18 and the spatial audio transducer array 20 comprising a plurality or at least three individual loudspeakers 20a to 20g.
  • the sun visor is attached to the headlining 24 via a joint 26 arranged at an edge of the headlining 24 or the roof and the windshield 28. Due to the joint 26 the sun visor 18 may have a closed position (cf. Fig. 2b and sun visor illustrated by broken lines within Fig. 2c ) in which the sun visor 18 is in contact or in parallel to the headlining 24. Furthermore, the sun visor 18 may be in an open position (cf. Fig. 2a and sun visor 18 of Fig. 2c ) in which the sun visor 18 is substantially in parallel to the windshield 28.
  • the loudspeaker array 20 is integrated into the sun visor 18 or its main surface.
  • the array 20 may be, for example, a line array.
  • a sound opening of the array 20 may be arranged at one or both of the two main surfaces of the sun visor 18.
  • the emission direction of the loudspeaker array 20 depends on the position of the sun visor 18. Therefore, it may be advantageous to use sound opening to both sides or bidirectional loudspeakers 20a to 20g, like dipole loudspeakers. Due to this, a proper spatial audio reproduction (multizone reproduction, e.g. realized by spotforming) for the passenger may be provided independent from the position of the sun visor.
  • the audio signal for the plurality of loudspeakers 20a to 20g may be adapted dependent on the position of the sun visor 18, such that a sound direction is adjusted. Therefore, the spatial audio transducer system 100 may comprise an optional sensor 30 for detecting the position of the sun visor 18.
  • the sensor 30 may be configured to detect whether the sun visor 18 is in the open or the closed position.
  • the sensor 30 may be configured to detect an angle of the sun visor 18 against the headlining 24.
  • the audio signal for the array 20 e.g. the frequency range or the phase
  • the audio signal for the array 20 may be adapted gradually or continuously.
  • the array 20 may be integrated or attached to the headlining 24.
  • This variant is marked by a star within Fig. 2c .
  • the array 20* is arranged at the headlining overlapping the sun visor in a closed position.
  • it may be beneficial to adapt the audio signal dependent on the position of the sun visor 18.
  • the array 20 emitting sound via the main surface in the closed position may be activated when a sun visor is in a closed position, wherein the array 20* may be activated when the sun visor is in the open position.
  • the array 20* may also be positioned directly in front of the closed sun visor 18. This placement would imply the weakest influence of the sun visor on the radiation properties.
  • the sun visor 18 represents an obstacle, which must not be restricted in its positioning due to loudspeaker positioning.
  • the sun visor can influence the radiation properties of the loudspeaker beneficially. This effect has either to be minimized or the filters implementing array processing approaches have to be adapted accordingly.
  • the array 20 or 20* may be coupled to the processor for processing the audio signal. This processing may comprise tuning of an equalizer or switching on or off the equalizer or other means, e.g. for adapting the frequency range of the seven loudspeakers 20a to 20g.
  • the processor may be implemented as a CPU or as a filter, like explained with respect to Fig. 1b or 1c .
  • transducers 20a to 20g it should be noted that above embodiments or variants are not related to a specific transducer concept can be realized with any transducer concept, like electrodynamic actuators, electrostatic actuators, air motion transformers, or others. Even though in above embodiments or variants, the concept of the invention is explained in the context of audio transducers in the sense of loudspeakers, it should be noted that the invention is not limited to transducers configured to emit a sound, but also may be realized with microphone arrays or a combination of loudspeakers and microphone arrays.
  • Figs. 3a to 3c show a further embodiment using the above teachings.
  • Fig. 3a shows the passenger's view of the spatial audio transducer system 100' in the open position, wherein Fig. 3b shows the closed position.
  • Fig. 3c shows the side view of the system 100'.
  • the below description of the system 100' starts from the assumption that a rotatable sun visor 18' comparable to the sun visor 18 having the joint 26 is used; note that this concept of the audio transducer system 100' may also be useable in combination with other types of sun visors.
  • the spatial audio transducer system 100' combines an acoustically transparent sun visor 18' with a loudspeaker array 20' (comparable to the loudspeaker array 20 or 20*) mounted at the headlining 24 behind the closed sun visor (cf. Fig. 3c , sun visor 18' illustrated by broken lines).
  • the loudspeakers 20' do not need to be integrated into the roof interior but can be. Given that the frame of the sun visor 18' is small enough, it will not influence the loudspeaker radiation property significantly. Hence, this variant could have a high technical merit.
  • this embodiment of the spatial audio transducer system 100' maybe combined with the sensor or angle sensor 30 as described with respect to Fig. 2 .
  • Fig. 4 shows a system 100", wherein Fig. 4a shows the passenger's view of the open sun visor 18", Fig. 4b shows a passenger's view of the closed sun visor 18" and Fig. 4c shows a corresponding side view of the open and the closed position of the sun visor 18".
  • This sun visor 18" may have a recess at the edge for the joint 26" in which the audio transducer array 20" is arranged.
  • the loudspeaker array 20" (comparable to the loudspeaker arrays 20, 20*, 20') is positioned near the rotation axis of the sun visor.
  • the joint 26 is replaced by a joint 26" comprising the plurality of 20a to 20g.
  • the sun visor 18" is likely to significantly influence a sound field emitted by the loudspeakers 20a to 20g.
  • an influence can be considered when determining the filters implementing the chosen reproduction technique such that the desired acoustic scene can still be reproduced.
  • the sensor 30, that determines the actual position of the sun visor 18" and provides information to an algorithm that adapts the filters, may be used. It is still expected that the audio reproduction having an optimized reproduction will be convincing without such a measure in many cases.
  • Fig. 5 shows a spatial audio transducer system 100'" with the three views, passenger view open (a), passenger view closed (b), and side view (c).
  • the sun visor complies with the sun visor 18 of Fig. 2
  • the transducer array complies with the transducer array 20 of Fig. 2 .
  • the sun visor 18 is coupled to the headlining 24 or the windshield 28 using a rail 26"'. Due to the rail 26"' the sun visor 18 is movable along the rail 26'" instead of rotated.
  • the sun visor 18 is, for example, coupled with the rail 26'" via slight bearings or another linear guiding. This has the advantage that there is always the same side of the sun visor 18 facing the occupants, where the loudspeaker array 20 can be built in.
  • Fig. 6 shows a spatial audio transducer system 100"" in the three views, passenger open (a), passenger closed (b) and side view (c).
  • the arrangement of the sun visor 18"" complies with the arrangement of the sun visor 18 of Fig. 2 .
  • the sun visor 18"" is rotatable around the axis of the joint 26.
  • the loudspeaker array 20"" is integrated into the sun visor 18"", wherein same emits the sound via an opening 32 arranged at an edge of the sun visor 18"" opposite to the edge of the joint 26.
  • This position of the sound source enables that the opening 32 is at least partially directed to the passenger without the dependency of the position of the sun visor 18"". This is illustrated by Fig. 6c .
  • Fig. 7 shows, using the three views 7a, 7b and 7c, a spatial audio transducer system 100""" which substantially complies with the system 100, wherein two loudspeaker arrays 20'"" and 21'"" are integrated into the sun visor 18.
  • the loudspeaker array 20"" is integrated into a first main surface of the sun visor 18 opposite to a second main surface of the sun visor 18 facing to the headlining 24 at a closed position of the sun visor 18.
  • the second array 21'"" is integrated into the second main surface. That is, the sun visor is equipped with two loudspeaker arrays on both sides.
  • the respective loudspeaker array 20'"" or 21'"" facing to the passenger is activated, wherein the other loudspeaker array 20'"" or 21'"” is the deactivated.
  • the position sensor 30 may beneficial because the signals ideally emitted by the loudspeakers on both sides will strongly be dependent on position the sun visor 18.
  • the loudspeaker 21""' facing the ceiling 24 or the loudspeakers 20'"" facing the windshield 28 will be turned off.
  • An alternative variant would be to use built in loudspeaker drivers radiating to both sides of the sun visor 18, as explained with respect to Fig. 2 .
  • the sensor 30 is used as a switch to reverse the phase of the radiating signal, according to the side of the sun visor 18 facing to the occupant.
  • Figs. 8a to 8c show a spatial audio transducer system 100""" which substantially complies with the spatial audio transducer system 10"', wherein a two-dimensional spatial audio transducer array 20""" is integrated into the sun visor 18.
  • the loudspeaker array 20""" comprises two line arrays, each comprising seven loudspeakers 20a to 20g.
  • the transducers of the two dimensional array may be arranged within a plane or within a curved plane, e.g. curved around an edge of the sun visor 18.
  • the spatial audio transducer system comprises an audio processor enabling to process the plurality of audio signals for the plurality of transducers 26a to 26g, dependent on the relative position to the passenger, wherein the position of each transducer may be described based on a straight or curved line or a mathematical function describing the straight or curved line, wherein the function depends on a recent position of the sun visor.
  • the audio processor may be configured to process the audio signals according to beamforming or spotforming algorithms, according to wavefield synthesis algorithms or, in general, according to another algorithm type enabling spatial audio reproduction.
  • a preferred embodiment is multizone audio reproduction which is typically based on so-called spotforming technique (related to beamforming). Spotforming enables to direct sound to a predefined point in space, wherein beamforming enables to emit sound within in certain direction along which a sound field is generated.
  • spotforming technique related to beamforming
  • the loudspeaker arrays integrated into the sun visor may be combined with further loudspeakers integrated into the vehicle, for example loudspeakers integrated into the dashboard or into the door in order to enhance the frequency range of the system.
  • a vehicle comprises at least two spatial audio transducer systems, namely both integrated into the sun visors of the driver and of the assistance driver.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • 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)
  • Circuit For Audible Band Transducer (AREA)
EP15165463.9A 2015-01-30 2015-04-28 Lautsprecheranordnungspositionierung im wagen Withdrawn EP3051838A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15165463.9A EP3051838A1 (de) 2015-01-30 2015-04-28 Lautsprecheranordnungspositionierung im wagen
PCT/EP2016/051924 WO2016120451A1 (en) 2015-01-30 2016-01-29 In-car loudspeaker array positioning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15153258 2015-01-30
EP15165463.9A EP3051838A1 (de) 2015-01-30 2015-04-28 Lautsprecheranordnungspositionierung im wagen

Publications (1)

Publication Number Publication Date
EP3051838A1 true EP3051838A1 (de) 2016-08-03

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EP15165463.9A Withdrawn EP3051838A1 (de) 2015-01-30 2015-04-28 Lautsprecheranordnungspositionierung im wagen

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WO (1) WO2016120451A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3089907A3 (fr) * 2018-12-14 2020-06-19 Renault Sas Agencement d’un dispositif de microphone de téléphonie à l’intérieur d’un véhicule automobile

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856940A (ja) * 1981-10-01 1983-04-04 Fujitsu Ten Ltd 車載用スピ−カ
US5442813A (en) * 1993-01-09 1995-08-15 U.S. Philips Corporation Radiotelephone
JP2003044092A (ja) * 2001-08-03 2003-02-14 Alpine Electronics Inc 音声認識装置
US6959956B1 (en) * 2004-06-02 2005-11-01 Lear Corporation Acoustically transparent visor
US20070138825A1 (en) * 2004-02-27 2007-06-21 Daimlerchrysler Ag Motor vehicle having a microphone
US20080192953A1 (en) * 2004-10-04 2008-08-14 Holger Opfer Loudspeaker Arrangement in a Motor Vehicle
US20130336518A1 (en) * 2011-03-23 2013-12-19 Panasonic Corporation Loudspeaker, electronic apparatus using same, and mobile apparatus
EP2822292A1 (de) * 2013-07-03 2015-01-07 GN Netcom A/S Autolautsprechertelefon mit automatischer Anpassung der Richtungwirkung des Mikrofons

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856940A (ja) * 1981-10-01 1983-04-04 Fujitsu Ten Ltd 車載用スピ−カ
US5442813A (en) * 1993-01-09 1995-08-15 U.S. Philips Corporation Radiotelephone
JP2003044092A (ja) * 2001-08-03 2003-02-14 Alpine Electronics Inc 音声認識装置
US20070138825A1 (en) * 2004-02-27 2007-06-21 Daimlerchrysler Ag Motor vehicle having a microphone
US6959956B1 (en) * 2004-06-02 2005-11-01 Lear Corporation Acoustically transparent visor
US20080192953A1 (en) * 2004-10-04 2008-08-14 Holger Opfer Loudspeaker Arrangement in a Motor Vehicle
US20130336518A1 (en) * 2011-03-23 2013-12-19 Panasonic Corporation Loudspeaker, electronic apparatus using same, and mobile apparatus
EP2822292A1 (de) * 2013-07-03 2015-01-07 GN Netcom A/S Autolautsprechertelefon mit automatischer Anpassung der Richtungwirkung des Mikrofons

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