EP2815589B1 - Procédé de synthèse transaurale pour la spatialisation sonore - Google Patents

Procédé de synthèse transaurale pour la spatialisation sonore Download PDF

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Publication number
EP2815589B1
EP2815589B1 EP13710449.3A EP13710449A EP2815589B1 EP 2815589 B1 EP2815589 B1 EP 2815589B1 EP 13710449 A EP13710449 A EP 13710449A EP 2815589 B1 EP2815589 B1 EP 2815589B1
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EP
European Patent Office
Prior art keywords
signal
stereo
spatialized
producing
signals
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EP13710449.3A
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German (de)
English (en)
French (fr)
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EP2815589A1 (fr
Inventor
Franck Rosset
Jean-Luc HAURAIS
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S3/00Systems employing more than two channels, e.g. quadraphonic
    • H04S3/002Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00Stereophonic arrangements
    • H04R5/033Headphones for stereophonic communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S3/00Systems employing more than two channels, e.g. quadraphonic
    • H04S3/02Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S2400/00Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S2420/00Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/01Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]

Definitions

  • the present invention relates to the field of sound spatialization, so-called spatialised, of audio signals, integrating in particular a room effect, particularly in the field of transaural techniques.
  • binaural refers to the reproduction on a stereophonic headphones, or a pair of headphones or a pair of speakers, a sound signal with nevertheless spatialization effects.
  • the invention is however not limited to the aforementioned technique and applies, in particular, to techniques derived from “binaural” such as “transaural” (commercial name) restitution techniques, that is to say on remote loudspeakers, installed for example in a concert hall or cinema with a multi-point sound system.
  • a specific application of the invention is, for example, the enrichment of audio content broadcast by a pair of speakers to immerse a listener in a spatialized sound scene, including in particular a room effect or outdoor space.
  • the state of the art defines a transfer function, or filter, of a sound signal between a position of a sound source in the space and the two ears of a listener.
  • the acoustic transfer function of the aforementioned head is designated HRTF for "Head Related Transfer Function” in English in its form.
  • frequency and HRIR for "Head Related Impulse Response” in English in its temporal form.
  • the binaural technique consists in applying such acoustic transfer functions of the head to monophonic audio signals, in order to obtain a stereophonic signal which makes it possible, when listening to headphones, to have the feeling that the sources sounds come from a particular direction of space.
  • the signal from the right ear is obtained by filtering the monophonic signal by the HRTF of the right ear and the left ear signal is obtained by filtering the same monophonic signal by the HRTF of the left ear.
  • the method according to the invention is defined in claim 1 and comprises a first processing (1) of producing a database of pulse signals from the acquisition of acoustic signals in a plurality of physical spaces, by the recording signals produced by loudspeakers in response to a reference multifrequency signal.
  • This stereo signal can then be broadcast by a pair of standard loudspeakers, to restore a spatialized sound environment corresponding to the space that has been used to produce the impulse response signals or a combination of such spaces.
  • This step is replicated a plurality of times. It is illustrated by the figure 2 .
  • Each of the speakers (5 to 11) is then successively applied to an original multifrequency signal using the amplifier (14).
  • This original signal is for example a sequence of a duration of between 10 and 90 seconds, with a frequency variation in the sound spectrum.
  • This signal is for example a linear variation between 20 Hz and 20 kHz, or any signal covering the entire spectrum of the enclosure.
  • the sound signal produced by the active speaker is picked up by the microphone torque (12, 13) and produces a recorded stereo signal. From this signal is carried out at 96 Khz sampling in a known manner and at a fast Fourier transform deconvolution between the original signal and the recorded signal, to construct an impulse response for the chamber considered in space considered physical.
  • This step is repeated for each of the speakers (5 to 11) of the series, then for different physical spaces where a series of identical or different speakers is re-inserted with an identical or different amplifier and identical microphones.
  • This first step leads to the construction of a database of stereo impulse responses.
  • This step makes it possible to construct a spatial stereo audio signal from a multichannel signal N.i corresponding to a traditional digital recording.
  • This step consists in selecting in the database formed during the initial step N + i impulse responses.
  • the selection will consist in associating with each of the N + i signals one of the impulse responses of said database, by ensuring that the acquisition position in the space of the impulse response corresponds to the position in the space of the channel with which it is associated.
  • N + 1 pairs of spatialized signals S j sG and S j sD are thus produced , with J being between 1 and N + 1.
  • channel equalization is performed to improve the dynamics of the signals.
  • the final step is to recombine the signals to construct a spatialized right and left signal pair.
  • the signals S j sG corresponding to the space on the left are added to construct the left channel of the spatialized stereo signal.
  • the same procedure is followed for the signals S j sD corresponding to the space on the right, to construct the right channel of the spatialized stereo signal.
  • the channels are equalized to improve the dynamics of the two channels.
  • the signal to be spatialized is not of the Ni type but simply a stereo signal
  • a step is taken intermediate consisting of building a signal Ni by phase extraction treatments between the left and right track, to build different new signals.
  • This extraction by phase consists in producing a signal corresponding to a reconstructed central channel, by a processing consisting in adding the signal of the left channel with a signal of the straight line which is out of phase, for example in phase opposition.
  • the left and right tracks are phase-shifted, with different phase-shift angles, and the out-of-phase signal pairs are added, with empirically determined weights in order to restore a spacialized soundscape.
  • frequency filters are applied to right and left signals when creating "reconstructed" channels, in order to increase signal dynamics and maintain high fidelity sound quality.
  • the figure 3 represents a schematic view of the rendering installation, from a pair of actual speakers (17, 18).
  • This pair of speakers (17, 18) receives a signal for simulating calculated speakers (20 to 27 and 30 to 37).
  • the effective number of calculated speakers (20 to 27) corresponds to the number of physical speakers (5 to 11; 17) used for the production of the pulse signal database, or to the number of virtual speakers reconstructed by the method referred to above.
  • Virtual speakers (30 to 37) are also created which produce a perception in the sound space of a combination of real neighboring speakers, to fill the sound holes.
  • These virtual speakers are created by a modification of the signal supplying the neighboring real speakers.
  • This stereo signal is then applied to a conventional audio equipment, connected to a pair of speakers (18, 19), which will reproduce a spatialized sound environment corresponding to the sound environment of the installation that was used to build the base impulse signals, or a virtual sound environment corresponding to the combination of several original atmospheres, where appropriate enriched with virtual atmospheres.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Stereophonic System (AREA)
EP13710449.3A 2012-02-13 2013-02-11 Procédé de synthèse transaurale pour la spatialisation sonore Active EP2815589B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1251328A FR2986932B1 (fr) 2012-02-13 2012-02-13 Procede de synthese transaurale pour la spatialisation sonore
PCT/FR2013/050278 WO2013121136A1 (fr) 2012-02-13 2013-02-11 Procédé de synthèse transaurale pour la spatialisation sonore

Publications (2)

Publication Number Publication Date
EP2815589A1 EP2815589A1 (fr) 2014-12-24
EP2815589B1 true EP2815589B1 (fr) 2017-04-05

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EP13710449.3A Active EP2815589B1 (fr) 2012-02-13 2013-02-11 Procédé de synthèse transaurale pour la spatialisation sonore

Country Status (10)

Country Link
EP (1) EP2815589B1 (ru)
JP (1) JP6421385B2 (ru)
KR (1) KR20140128412A (ru)
CN (1) CN104160722B (ru)
BR (1) BR112014019926A2 (ru)
FR (1) FR2986932B1 (ru)
HK (1) HK1204188A1 (ru)
IN (1) IN2014DN06776A (ru)
RU (1) RU2639955C2 (ru)
WO (1) WO2013121136A1 (ru)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3065137B1 (fr) 2017-04-07 2020-02-28 Axd Technologies, Llc Procede de spatialisation sonore

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020133327A1 (en) * 1998-03-31 2002-09-19 Mcgrath David Stanley Acoustic response simulation system

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US20030035553A1 (en) * 2001-08-10 2003-02-20 Frank Baumgarte Backwards-compatible perceptual coding of spatial cues
JP4062959B2 (ja) * 2002-04-26 2008-03-19 ヤマハ株式会社 残響付与装置、残響付与方法、インパルス応答生成装置、インパルス応答生成方法、残響付与プログラム、インパルス応答生成プログラムおよび記録媒体
US6937737B2 (en) * 2003-10-27 2005-08-30 Britannia Investment Corporation Multi-channel audio surround sound from front located loudspeakers
KR20050060789A (ko) * 2003-12-17 2005-06-22 삼성전자주식회사 가상 음향 재생 방법 및 그 장치
JP2005252332A (ja) * 2004-03-01 2005-09-15 Clarion Co Ltd 音場再生装置及びその制御方法
US8175286B2 (en) * 2005-05-26 2012-05-08 Bang & Olufsen A/S Recording, synthesis and reproduction of sound fields in an enclosure
JP2006339694A (ja) * 2005-05-31 2006-12-14 D & M Holdings Inc オーディオ信号出力装置
US7970626B2 (en) * 2005-07-08 2011-06-28 Oltine Acquistitions NY LLC Facilitating payments to health care providers
KR100619082B1 (ko) * 2005-07-20 2006-09-05 삼성전자주식회사 와이드 모노 사운드 재생 방법 및 시스템
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US20020133327A1 (en) * 1998-03-31 2002-09-19 Mcgrath David Stanley Acoustic response simulation system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JEUB M ET AL: "A binaural room impulse response database for the evaluation of dereverberation algorithms", DIGITAL SIGNAL PROCESSING, 2009 16TH INTERNATIONAL CONFERENCE ON, IEEE, PISCATAWAY, NJ, USA, 5 July 2009 (2009-07-05), pages 1 - 5, XP031510342, ISBN: 978-1-4244-3297-4 *

Also Published As

Publication number Publication date
IN2014DN06776A (ru) 2015-05-22
EP2815589A1 (fr) 2014-12-24
WO2013121136A1 (fr) 2013-08-22
BR112014019926A2 (pt) 2017-07-04
CN104160722B (zh) 2018-01-12
JP6421385B2 (ja) 2018-11-14
RU2014133066A (ru) 2016-04-10
CN104160722A (zh) 2014-11-19
JP2015510348A (ja) 2015-04-02
FR2986932B1 (fr) 2014-03-07
KR20140128412A (ko) 2014-11-05
RU2639955C2 (ru) 2017-12-25
HK1204188A1 (en) 2015-11-06
FR2986932A1 (fr) 2013-08-16

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