EP2469892A1 - Reproduction d'un champ sonore dans une zone de sonorisation ciblée - Google Patents

Reproduction d'un champ sonore dans une zone de sonorisation ciblée Download PDF

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Publication number
EP2469892A1
EP2469892A1 EP10176848A EP10176848A EP2469892A1 EP 2469892 A1 EP2469892 A1 EP 2469892A1 EP 10176848 A EP10176848 A EP 10176848A EP 10176848 A EP10176848 A EP 10176848A EP 2469892 A1 EP2469892 A1 EP 2469892A1
Authority
EP
European Patent Office
Prior art keywords
sound field
drive signal
sound
target
reproduced
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.)
Ceased
Application number
EP10176848A
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German (de)
English (en)
Inventor
Jens Ahrens
Sascha Spors
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.)
Technische Universitaet Berlin
Deutsche Telekom AG
Original Assignee
Technische Universitaet Berlin
Deutsche Telekom AG
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 Technische Universitaet Berlin, Deutsche Telekom AG filed Critical Technische Universitaet Berlin
Priority to EP10176848A priority Critical patent/EP2469892A1/fr
Publication of EP2469892A1 publication Critical patent/EP2469892A1/fr
Ceased legal-status Critical Current

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    • 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
    • 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
    • H04S7/303—Tracking of listener position or orientation

Definitions

  • the present invention relates to the reproduction or reconstruction of a sound field in a target sound area with the aid of a plurality of electroacoustic transducers.
  • the technique of wave field synthesis can be used for the authentic physical reconstruction of a sound field over a wide range.
  • This technique uses a large number of loudspeakers and thereby avoids the problem that in an area within the loudspeaker arrangement, the so-called "sweet spot", the reconstruction of the desired sound field is significantly more accurate than in the rest of the audible range, as is the case for example with the stereo.
  • Technique occurs.
  • stereo methods not a sound field is physically reconstructed. Instead, two speakers create an illusion that sounds very similar to the natural model, but has completely different physical properties. In stereo, there is a sweet spot in that the illusion sounds most authentic at this point.
  • the loudspeaker drive signals for the individual loudspeakers in the wave field synthesis are calculated analytically. In the practical implementation, however, there are large deviations from the desired sound field over the entire potential listening area.
  • the technique of wave field synthesis is for example in the publication by S. Spors, R. Rabenstein, and J. Ahrens, "The Theory of Wave Field Synthesis Revisited," Proceedings of the 124th Convention of the Audio Engineering Society, May 17-20, Amsterdam, The Netherlands, 2008 described.
  • Ambisonics Another known technique for reconstruction of a sound field is called Ambisonics and is for example in the WO 2005/0195954 A2 described.
  • This technique requires circular or spherical arrangements of loudspeakers, where the loudspeaker signals are generated using numerical algorithms.
  • the limitation of the spatial bandwidth of the drive signals necessary in the calculation path causes the reconstruction of the desired sound field in the center of the loudspeaker arrangement to be most accurate. In the center of the loudspeaker arrangement is therefore a sweet spot. With increasing Distance from the center of the speaker assembly, the deviations in the reconstructed sound field are larger.
  • J. Hannemann and KD Donohue "Virtual Sound Source Rendering Using a Multipole Expansion and Method-of-Moments Approach," J.
  • Audio Eng. Soc., Vol. 56, No. 6, June 2008 describes a method related to the Ambisonics method, which makes it possible to choose relatively freely the arrangement of the loudspeakers and the location of the sweet spot. Again, the loudspeaker signals are calculated using numerical and thus very computationally intensive algorithms.
  • the arrangement of the speakers should be subject to as few restrictions as possible.
  • the present invention provides a method and a device for reproducing a sound field in a target sound area.
  • electroacoustic transducers so speakers are arranged on a contour.
  • a drive signal for the electroacoustic transducer is determined analytically.
  • this analytical determination results in a resulting sound field, which exactly corresponds to the sound field to be reproduced below a certain frequency, also called aliasing frequency. Above this aliasing frequency, deviations from the target sound field occur depending on the location, and there is no area in which significantly fewer deviations occur than elsewhere. This is inherent in the analytical determination.
  • the analytical determination can be achieved according to a known method by analytically solving an integral equation describing the sound field to be reproduced.
  • the desired sound field is thus described in a spatial frequency range.
  • the loudspeaker activation signals via the explicit solution of the integral equation, which is described in more detail below.
  • the loudspeaker drive signals can be obtained via the relationships of the Kirchhoff-Helmholtz integral (as in wave field synthesis).
  • the determined drive signal is changed in such a way that an optimization range arises in which the resulting sound field corresponds to the sound field to be reproduced significantly more accurately, as this would be the case without the change of the drive signal.
  • This change is made by spatial band limitation.
  • the band limitation does not have to be performed symmetrically around the frequency 0, but can be configured as desired.
  • the target sonic range with increased accuracy may be fixed, but it may also be changed depending on the position of a receiver. In the latter case, the change of the drive signal then preferably takes place in real time. For example, this method can then be used to determine a position of a receiver within the target sounding area and then to change the control signal in such a way that the desired position is adjusted accordingly.
  • the changed drive signal is supplied to the electroacoustic transducers.
  • the converters convert the input electrical signals into sound signals, and emit them into the target PA range.
  • the present invention also provides an apparatus for reproducing a sound field in a target sound area.
  • the device has a plurality of arranged on a contour electro-acoustic transducer and a processing module.
  • the processing module is able to analytically determine from signals about the desired position and audio input signals a drive signal for the electroacoustic transducers and to change the drive signal such that an optimization range is created in which the resulting sound field corresponds more closely to the sound field to be reproduced than without the change would be the case.
  • the range in which the resulting sound field is to most accurately correspond to the sound field to be reproduced may be shifted to a predetermined position.
  • the drive signals may further be amplified by means of an amplifier unit and supplied to the electroacoustic transducers.
  • an optimization range can be generated, from which the reproduced sound field corresponds as closely as possible to the desired sound field.
  • the optimization area in which the reconstruction of the desired sound field is most accurate, can then be shifted to a desired position.
  • the playback can be optimized to any location within the Zielbeschallungs Schemes.
  • This change in the preferred emission direction can be performed in real time so that the reproduction can be tracked, for example, to a moving receiver.
  • the determination of the location of the receiver can be carried out here by means of sensors, for example a camera.
  • the invention can be used to reproduce audio signals, in particular multi-channel audio signals.
  • the audio signals can be provided by a variety of devices, such as CD, DVD or Blu-ray Disc devices, MP3 devices, computers or the like.
  • the reproduced audio signals may be MPEG2 or MPEG4 signals, for example, or be in a Dolby format.
  • Fig. 1 schematically a device according to an embodiment of the present invention is shown.
  • a contour 11 at the edge of the Zielbeschallungs Colours 10 or in several speakers 20 are arranged.
  • the drive signals for the loudspeakers 20 are determined in a processing module 30 and supplied to the loudspeakers 20 via an amplifier unit 31.
  • the processing module 30 is fed with information 1 about the current location for which the sound reconstruction is to be optimized and audio input signals 2.
  • the processing module 30 receives a third input signal 3 which carries information about the desired sound field (eg position of the virtual sound source).
  • the drive signal is first analytically, for example according to the publication already mentioned above Ahrens and S. Spors, "Reproduction of a plane-wave sound field using planar and linear arrays of loudspeakers", IEEE Int. Symposium on Communications Control and Signal Processing, St Julian's, Malta, 12-14. March 2008 performed procedures, calculated.
  • the integral here is a surface or line integral, depending on whether the calculation is to take place in three dimensions or only in one plane.
  • D ⁇ D ⁇ ⁇ e e denotes the basis of the transformation.
  • e is given by the complex exponential function.
  • a function W representing the optimization is introduced according to the invention.
  • the loudspeaker drive signal D is not calculated in the spatial frequency range, then D can be subsequently transformed into a suitable spatial frequency range with a suitable transformation in order to apply the function W as described above.
  • the playback can be optimized to any location.
  • a sweet spot may be generated by restricting the spatial bandwidth of the driving function D.
  • Such a spatial bandwidth limitation can be carried out in real time, so that the reproduction can be tracked, for example, to a moving receiver.
  • a camera can be used to determine the position of the receiver and then optimize the playback to that position.
  • the determination of the position of the receiver can also be done by a sensor that the listener carries, for example, in his pocket with it.
  • Fig. 2 (b), (c) is shown the sound field generated by the speakers.
  • the loudspeakers are located on the dashed lines indicated linear contour at the edge of the Zielbeschallungs Colours.
  • Fig. 2 (a) is the desired sound field shown in Fig. 2 (b) the result if no optimization function W is applied. The deviations of the reconstruction from the desired sound field can be clearly seen.
  • the application of the optimization function W according to the present invention allows the accuracy of the reconstruction to be optimized in any range as in FIG Fig. 2 (c) shown.
  • the center of the optimization area is indicated by a cross. If a listener moves beyond this optimization range, the system can track the optimization so that the sound field playback is optimal for the selected receiver.
  • the invention also includes individual features in the figures, even if they are shown there in connection with other features and / or not mentioned above.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP10176848A 2010-09-15 2010-09-15 Reproduction d'un champ sonore dans une zone de sonorisation ciblée Ceased EP2469892A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10176848A EP2469892A1 (fr) 2010-09-15 2010-09-15 Reproduction d'un champ sonore dans une zone de sonorisation ciblée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10176848A EP2469892A1 (fr) 2010-09-15 2010-09-15 Reproduction d'un champ sonore dans une zone de sonorisation ciblée

Publications (1)

Publication Number Publication Date
EP2469892A1 true EP2469892A1 (fr) 2012-06-27

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EP10176848A Ceased EP2469892A1 (fr) 2010-09-15 2010-09-15 Reproduction d'un champ sonore dans une zone de sonorisation ciblée

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108834038A (zh) * 2014-03-28 2018-11-16 三星电子株式会社 用于渲染声学信号的方法和设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040223620A1 (en) * 2003-05-08 2004-11-11 Ulrich Horbach Loudspeaker system for virtual sound synthesis
WO2005015954A2 (fr) 2003-07-30 2005-02-17 France Telecom Procede et dispositif de traitement de donnees sonores en contexte ambiophonique
EP2182744A1 (fr) * 2008-10-30 2010-05-05 Deutsche Telekom AG Retransmission d'un champ sonore dans une zone de sonorisation ciblée

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040223620A1 (en) * 2003-05-08 2004-11-11 Ulrich Horbach Loudspeaker system for virtual sound synthesis
WO2005015954A2 (fr) 2003-07-30 2005-02-17 France Telecom Procede et dispositif de traitement de donnees sonores en contexte ambiophonique
EP2182744A1 (fr) * 2008-10-30 2010-05-05 Deutsche Telekom AG Retransmission d'un champ sonore dans une zone de sonorisation ciblée

Non-Patent Citations (12)

* Cited by examiner, † Cited by third party
Title
AHRENS J ET AL: "Reproduction of a plane-wave sound field using planar and linear arrays of loudspeakers", COMMUNICATIONS, CONTROL AND SIGNAL PROCESSING, 2008. ISCCSP 2008. 3RD INTERNATIONAL SYMPOSIUM ON, IEEE, PISCATAWAY, NJ, USA, 12 March 2008 (2008-03-12), pages 1486 - 1491, XP031269306, ISBN: 978-1-4244-1687-5 *
EVERT W START ET AL: "APPLICATION OF SPATIAL BANDWIDTH REDUCTION IN WAVE FIELD SYNTHESIS", AN AUDIO ENGINEERING SOCIETY PREPRINT, 26 February 1995 (1995-02-26), XP055425445, Retrieved from the Internet <URL:http://www.aes.org/tmpFiles/elib/20171115/7794.pdf> [retrieved on 20171115] *
J. AHRENS; S. SPORS: "Analytical driving functions for higher order Ambisonics", IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, 30 March 2008 (2008-03-30)
J. AHRENS; S. SPORS: "Reproduction of a plane-wave sound field using planar and linear arrays of loudspeakers", IEEE INT. SYMPOSIUM ON COMMUNICATIONS CONTROL AND SIGNAL PROCESSING, 12 March 2008 (2008-03-12)
J. HANNEMANN; K. D. DONOHUE: "Virtual Sound Source Rendering Using a Multipole-Expansion and Method-of-Moments Approach", J. AUDIO ENG. SOC., vol. 56, no. 6, June 2008 (2008-06-01), XP040508482
KOLUNDZIJA MIHAILO ET AL: "Designing Practical Filters for Sound Field Reconstruction", AES CONVENTION 127; OCTOBER 2009, AES, 60 EAST 42ND STREET, ROOM 2520 NEW YORK 10165-2520, USA, 1 October 2009 (2009-10-01), XP040509132 *
KOLUNDZIJA MIHAILO ET AL: "Sound Field Reconstruction: An Improved Approach for Wave Field Synthesis", AES CONVENTION 126; MAY 2009, AES, 60 EAST 42ND STREET, ROOM 2520 NEW YORK 10165-2520, USA, 1 May 2009 (2009-05-01), XP040509036 *
M. KOLUNDZIJA; C. FALLER; M. VETTERLI: "Sound Field Reconstruction: An Improved Approach For Wave Field Synthesis", 126TH CONVENTION OF THE AES, 7 May 2009 (2009-05-07)
S. SPORS: "Reproduction of a plane-wave sound field using planar and linear arrays of loudspeakers", IEEE INT. SYMPOSIUM ON COMMUNICATIONS CONTROL AND SIGNAL PROCESSING, 12 March 2008 (2008-03-12)
S. SPORS; R. RABENSTEIN; J. AHRENS: "The Theory of Wave Field Synthesis Revisited", PROCEEDINGS OF THE 124TH CONVENTION OF THE AUDIO ENGINEERING SOCIETY, 17 May 2008 (2008-05-17)
SPORS SASCHA ET AL: "Spatial Sampling Artifacts of Wave Field Synthesis for the Reproduction of Virtual Point Sources", AES CONVENTION 126; MAY 2009, AES, 60 EAST 42ND STREET, ROOM 2520 NEW YORK 10165-2520, USA, 1 May 2009 (2009-05-01), XP040509026 *
VÄLJAMÄE ALEKSANDER: "A feasibility study regarding implementation of holographic audio rendering techniques over broadcast networks", INTERNET CITATION, 15 April 2003 (2003-04-15), pages 1 - 44, XP002529548, Retrieved from the Internet <URL:http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.9.9156&rep=r ep1&type=pdf> [retrieved on 20090526] *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108834038A (zh) * 2014-03-28 2018-11-16 三星电子株式会社 用于渲染声学信号的方法和设备
US10687162B2 (en) 2014-03-28 2020-06-16 Samsung Electronics Co., Ltd. Method and apparatus for rendering acoustic signal, and computer-readable recording medium
CN108834038B (zh) * 2014-03-28 2021-08-03 三星电子株式会社 用于渲染声学信号的方法和设备

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