EP1994526B1 - Gemeinsame schallsynthese und -spatialisierung - Google Patents

Gemeinsame schallsynthese und -spatialisierung Download PDF

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Publication number
EP1994526B1
EP1994526B1 EP07731685A EP07731685A EP1994526B1 EP 1994526 B1 EP1994526 B1 EP 1994526B1 EP 07731685 A EP07731685 A EP 07731685A EP 07731685 A EP07731685 A EP 07731685A EP 1994526 B1 EP1994526 B1 EP 1994526B1
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EP
European Patent Office
Prior art keywords
spatialization
parameters
source
channel
frequency component
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Active
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EP07731685A
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English (en)
French (fr)
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EP1994526A1 (de
Inventor
Grégory PALLONE
Marc Emerit
David Virette
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Orange SA
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France Telecom SA
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Priority to PL07731685T priority Critical patent/PL1994526T3/pl
Publication of EP1994526A1 publication Critical patent/EP1994526A1/de
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10HELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H7/00Instruments in which the tones are synthesised from a data store, e.g. computer organs
    • 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
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10HELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2210/00Aspects or methods of musical processing having intrinsic musical character, i.e. involving musical theory or musical parameters or relying on musical knowledge, as applied in electrophonic musical tools or instruments
    • G10H2210/155Musical effects
    • G10H2210/265Acoustic effect simulation, i.e. volume, spatial, resonance or reverberation effects added to a musical sound, usually by appropriate filtering or delays
    • G10H2210/295Spatial effects, musical uses of multiple audio channels, e.g. stereo
    • G10H2210/301Soundscape or sound field simulation, reproduction or control for musical purposes, e.g. surround or 3D sound; Granular synthesis
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10General applications
    • H04R2499/11Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the present invention relates to audio processing and, more particularly, to three-dimensional spatialization of synthetic sound sources.
  • non- parametric methods are known .
  • No particular parameter is used a priori to modify samples previously stored in memory.
  • the best-known representative of these methods is classical wave table synthesis.
  • transaural or " binaural
  • HRTFs Head Related Transfer Function
  • transfer functions representing the disturbance of acoustic waves by the morphology of an individual, these HRTFs functions being specific to this individual.
  • the sound reproduction is done in a manner adapted to the HRTFs of the listener, typically on two remote speakers (" transaural ") or from the two earpieces of a headset (" binaural ") .
  • Other techniques for example “ surround “ or “multichannel” (5.1 to 10.1 or more) rather provide a restitution on more than two speakers.
  • some HRTFs techniques use the separation of the frequency and position variables of the HRTFs, thus giving a set of p basic filters (corresponding to the first p eigenvalues of the covariance matrix of the HRTFs whose variables statistics are the frequencies), these filters being weighted by spatial functions (obtained by projection of the HRTFs on basic filters).
  • the spatial functions can then be interpolated, as described in the document US 5500900 .
  • Spatialization of many sound sources can be achieved through a multichannel implementation applied to the signal of each of the sound sources.
  • the gains of the spatialization channels are applied directly to the sound samples of the signal, often described in the time domain (but possibly also in the frequency domain). These samples sound are treated by a spatialization algorithm (with application of gains that depend on the desired position), regardless of the origin of these samples.
  • the proposed spatialization could apply to both natural and synthetic sounds.
  • each sound source must be synthesized independently (with a temporal or frequency signal), in order to then be able to apply independent spatialization gains.
  • N sound sources it is therefore necessary to perform N synthesis calculations.
  • the application of the gains to sound samples, whether they come from the time or frequency domain requires at least as many multiplications as there are samples.
  • M being the number of intermediate channels (surround channels for example)
  • N being the number of sources.
  • the so-called “ virtual loudspeakers” method makes it possible to encode the signals to be spatialized by applying them in particular gains, the decoding being done by convolution of the signals encoded by pre-calculated filters (Jérians Daniel, " Representation of acoustic fields, application to the transmission and reproduction of complex sound scenes in a multimedia context " , PhD Thesis, 2000).
  • an example embodiment that is referred to in this document WO-05/069272 and in which the sources are synthesized by associating amplitudes with frequencies constituting a " sound timbre " (for example a fundamental frequency and its harmonics), provides for grouping by identical frequencies synthesis signals, with a view to spatialization subsequent operating on the frequencies.
  • a sound timbre for example a fundamental frequency and its harmonics
  • amplitudes of a set at 0 j , a 1 j , ..., a p j to be assigned to a same source j can be zero if the corresponding frequencies are not represented in the sound signal of this source j .
  • the amplitudes a i 1 , ..., a i N relative to each frequency f i are grouped (" mixed ") to be applied, frequency by frequency, to the SPAT spatialization block for a frequency-based encoding (in binaural by example, then providing an interaural delay to apply to each source).
  • the signals of the channels c 1 ,..., C k , originating from the spatialization block SPAT, are then intended to be transmitted through one or more networks, or else stored, or other, for the purpose of a subsequent restitution (preceded by where appropriate, a suitable spatialization decoding).
  • the present invention improves the situation.
  • the present invention proposes for this purpose to first apply a spatialization encoding, then a " pseudo-synthesis " , the term “ pseudo " aiming at the fact that the synthesis applies in particular to the encoded parameters, derived from spatialization and not to usual synthetic sound signals.
  • a feature that the invention proposes is the spatial encoding of some synthesis parameters, rather than performing a spatial encoding of the signals corresponding directly to the sources.
  • This spatial encoding applies more particularly to synthesis parameters which are representative of an amplitude and it advantageously consists in applying to these few synthesis parameters spatialization gains which are calculated as a function of respective desired positions of the sources. It will thus be understood that the parameters multiplied by the gains in step b) and grouped in step c) are not really sound signals, as in the general prior art described above.
  • the present invention uses a mutual parametric synthesis where one of the parameters has the dimension of an amplitude. Unlike techniques of the prior art, it thus takes advantage of the advantages of such a synthesis to perform the spatialization.
  • the combination of synthesis parameter sets obtained for each of the sources advantageously makes it possible to globally control the encoded blocks of mutual parametric synthesis.
  • the present invention then makes it possible to spatialize simultaneously and independently of numerous synthesized sound sources from a parametric synthesis model, the spatialization gains being applied to the synthesis parameters rather than to the samples of the time or frequency domain. This embodiment thus ensures a substantial saving of the computing power required because it implies a low calculation cost.
  • the technique in the sense of the invention requires fewer calculations than the usual techniques in the sense of the prior art. For example, at the surround order 1 and in two dimensions (ie three intermediate channels), the invention already allows a calculation gain for only four sources to spatialize.
  • the present invention also makes it possible to reduce the number of gains to be applied. Indeed, the gains are applied to the synthesis parameters and not to the sound samples. Updating parameters such as the volume is generally less frequent than the sampling frequency of a signal, a calculation economy is thus achieved. For example, for a parameter update frequency (such as the volume in particular) of 200 Hz, a substantial saving in multiplication is achieved for a signal sampling frequency of 44100 Hz (in a ratio of about 200).
  • the fields of application of the present invention may concern both the musical field (including polyphonic ringtones of mobiles), the field of multimedia (including video game sound systems), the field of virtual reality (rendering of sound scenes). , simulators (synthesis of engine noise), or others.
  • new parameters p i m (i varying from 1 to N and m varying from 1 to M) are calculated by multiplying the parameters p i by the encoding gains g i m , obtained from the position of each of the sources.
  • the parameters p i m are combined (by summation in the example described) to provide the parameters p g m which feed M mutual parametric synthesis blocks.
  • These M blocks (referenced SYNTH (1) to SYNTH (M) on the figure 2 ) are constitutive SYNTH synthesis module, which delivers M time signals or frequency ss m (m ranging from 1 to M), obtained by synthesis from the parameters p g m .
  • These signals ss m can then feed a conventional block of spatial decoding, as will be seen later with reference to the figure 3 .
  • the synthesis used is an additive synthesis with application of an inverse Fourier transform (IFFT).
  • IFFT inverse Fourier transform
  • a set of N sources is characterized by a plurality of parameters p i, k representing the amplitude in the frequency domain of the k th frequency component for the i th source S i .
  • the parameter p i, k represents the amplitude of a given frequency component k for a given source S i .
  • p m i, k boy Wut m i - ⁇ p i , k , m varies from 1 to M.
  • the gains g m i are predetermined for a desired position for the source S i and according to the chosen spatialization encoding.
  • Each of the M time signals SS m (n) can then be supplied to a spatialization decoding block.
  • the adaptation filters from the surround format to the binaural format can be applied directly in the frequency domain, thus avoiding convolution in the time domain and a corresponding calculation cost.
  • each of the M frequency spectra ss m ( ⁇ ) is directly multiplied by the respective Fourier transforms of the temporal filters, noted Fg m ( ⁇ ) and Fd m ( ⁇ ) (adapted if necessary to have a coherent number of points), which is written:
  • Fg m ( ⁇ ) and Fd m ( ⁇ ) adapted if necessary to have a coherent number of points
  • the present invention also provides a device for generating synthetic and spatialized sounds, comprising in particular a processor, and in particular a working memory adapted to store instructions of the computer program product defined above.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Golf Clubs (AREA)
  • Telephone Set Structure (AREA)
  • Telephone Function (AREA)

Claims (7)

  1. Verfahren zum gemeinsamen Synthetisieren und Spatialisieren von mehreren Schallquellen in zugeordneten Positionen im Raum, das aufweist:
    a) einen Schritt der Zuweisung zu jeder Quelle mindestens eines Parameters (pi), der für eine Amplitude mindestens einer Frequenzkomponente der Quelle repräsentativ ist,
    b) einen Schritt der Spatialisierung, der eine Codierung in mehrere Kanäle durchführt, bei dem jeder Amplitudenparameter (pi) dupliziert wird, um ihn mit einer Spatialisierungsverstärkung (gi m) zu multiplizieren, wobei jede Spatialisierungsverstärkung einerseits für einen Codierkanal (pg m) und andererseits für eine zu spatialisierende Quelle (Si) bestimmt wird,
    c) einen Schritt des Zusammenfassens (R) der mit den Verstärkungen multiplizierten Parameter (pi m) in jeweiligen Kanälen (pg 1, ..., pg m), indem eine Summe der multiplizierten Parameter (pi m) an alle Quellen (Si) für jeden Kanal (pg m) angewendet wird, und
    d) einen Schritt der parametrischen Synthese (SYNTH (1), ..., SYNTH (M)), der an jeden der Kanäle (pg m) angewendet wird.
  2. Verfahren nach Anspruch 1, bei dem:
    a) jeder Quelle (Si) mehrere Parameter (pi,k) zugewiesen werden, die je für eine Amplitude einer Frequenzkomponente (fk) repräsentativ sind,
    b) jeder Amplitudenparameter (pi,k), der für eine Frequenzkomponente (fk) repräsentativ ist, dupliziert wird, um ihn mit einer Spatialisierungsverstärkung (gi m) zu multiplizieren, wobei jede Spatialisierungsverstärkung einerseits für einen Codierkanal (pg m) und andererseits für eine zu spatialisierende Quelle (Si) bestimmt wird,
    c) in jedem Kanal, Frequenzkomponente für Frequenzkomponente, die Produkte aus den Parametern (pi,k) und den Verstärkungen (gi m) in Unterkanälen (pg,k m) zusammengefasst werden, die je einer Frequenzkomponente (fk) zugeordnet sind.
  3. Verfahren nach Anspruch 2, bei dem die Synthese in jedem Kanal durchgeführt wird, indem:
    d1) der Ausgang jedes einer Frequenzkomponente (fk) zugeordneten Unterkanals mit einer spektralen Hüllkurve (envk) multipliziert wird, die auf eine Frequenz zentriert ist, die der Frequenzkomponente (fk) entspricht,
    d2) und indem durch eine Summe über die Frequenzkomponenten (fk) die resultierenden Produkte der Operation d1) zusammengefasst werden,
    um nach der Operation d2) ein von jedem Kanal stammendes Signal (ssm) zu erhalten, das spatialisierungscodiert und synthetisiert ist.
  4. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die Spatialisierung durch ambiophonische Codierung durchgeführt wird und die für eine Amplitude repräsentativen Parameter, die den Quellen zugewiesen werden, Amplituden von sphärischen Harmonischen (Ym) entsprechen.
  5. Verfahren nach Anspruch 4 in Kombination mit Anspruch 3, bei dem, um für eine Wiedergabe in binauraler Spatialisierung von einer ambiophonischen Codierung zu einer Decodierung überzugehen, eine Verarbeitung im Frequenzbereich direkt an die Ergebnisse der Produkte angewendet wird, die von den Kanälen nach der Operation d2) stammen.
  6. Computerprogrammprodukt, das in einem Speicher einer Zentraleineinheit oder eines Endgeräts und/oder einem entfernbaren Träger gespeichert ist, der mit einem Lesegerät der Zentraleinheit zusammenwirken kann, und/oder über ein Telekommunikationsnetz heruntergeladen werden kann, dadurch gekennzeichnet, dass es Anweisungen für die Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5 enthält.
  7. Modul zur Erzeugung von spatialisierten synthetischen Tönen, das insbesondere einen Prozessor enthält, dadurch gekennzeichnet, dass es außerdem einen Arbeitsspeicher aufweist, der Anweisungen des Computerprogrammprodukts nach Anspruch 6 speichert.
EP07731685A 2006-03-13 2007-03-01 Gemeinsame schallsynthese und -spatialisierung Active EP1994526B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07731685T PL1994526T3 (pl) 2006-03-13 2007-03-01 Połączona synteza i uprzestrzennienie dźwięków

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0602170 2006-03-13
PCT/FR2007/050868 WO2007104877A1 (fr) 2006-03-13 2007-03-01 Synthese et spatialisation sonores conjointes

Publications (2)

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EP1994526A1 EP1994526A1 (de) 2008-11-26
EP1994526B1 true EP1994526B1 (de) 2009-10-28

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US (1) US8059824B2 (de)
EP (1) EP1994526B1 (de)
JP (1) JP5051782B2 (de)
AT (1) ATE447224T1 (de)
DE (1) DE602007002993D1 (de)
ES (1) ES2335246T3 (de)
PL (1) PL1994526T3 (de)
WO (1) WO2007104877A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8786852B2 (en) 2009-12-02 2014-07-22 Lawrence Livermore National Security, Llc Nanoscale array structures suitable for surface enhanced raman scattering and methods related thereto
US9395304B2 (en) 2012-03-01 2016-07-19 Lawrence Livermore National Security, Llc Nanoscale structures on optical fiber for surface enhanced Raman scattering and methods related thereto
US9788135B2 (en) 2013-12-04 2017-10-10 The United States Of America As Represented By The Secretary Of The Air Force Efficient personalization of head-related transfer functions for improved virtual spatial audio
CN109691138A (zh) * 2016-10-04 2019-04-26 奥姆尼欧声音有限公司 立体声展开技术

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2679689B1 (fr) 1991-07-26 1994-02-25 Etat Francais Procede de synthese de sons.
WO1994010816A1 (en) 1992-10-29 1994-05-11 Wisconsin Alumni Research Foundation Methods and apparatus for producing directional sound
US5596644A (en) 1994-10-27 1997-01-21 Aureal Semiconductor Inc. Method and apparatus for efficient presentation of high-quality three-dimensional audio
FR2782228B1 (fr) 1998-08-05 2001-05-25 Ct Scient Tech Batiment Cstb Dispositif de simulation sonore et procede pour realiser un tel dispositif
FR2847376B1 (fr) * 2002-11-19 2005-02-04 France Telecom Procede de traitement de donnees sonores et dispositif d'acquisition sonore mettant en oeuvre ce procede
FI118247B (fi) * 2003-02-26 2007-08-31 Fraunhofer Ges Forschung Menetelmä luonnollisen tai modifioidun tilavaikutelman aikaansaamiseksi monikanavakuuntelussa
FR2851879A1 (fr) 2003-02-27 2004-09-03 France Telecom Procede de traitement de donnees sonores compressees, pour spatialisation.
US20070160216A1 (en) 2003-12-15 2007-07-12 France Telecom Acoustic synthesis and spatialization method
SE0400998D0 (sv) * 2004-04-16 2004-04-16 Cooding Technologies Sweden Ab Method for representing multi-channel audio signals
US8204261B2 (en) * 2004-10-20 2012-06-19 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Diffuse sound shaping for BCC schemes and the like
ES2396072T3 (es) * 2006-07-07 2013-02-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Aparato para combinar múltiples fuentes de audio paramétricamente codificadas
ES2358786T3 (es) * 2007-06-08 2011-05-13 Dolby Laboratories Licensing Corporation Derivación híbrida de canales de audio de sonido envolvente combinando de manera controlable componentes de señal de sonido ambiente y con decodificación matricial.

Also Published As

Publication number Publication date
JP2009530883A (ja) 2009-08-27
JP5051782B2 (ja) 2012-10-17
WO2007104877A1 (fr) 2007-09-20
ATE447224T1 (de) 2009-11-15
EP1994526A1 (de) 2008-11-26
ES2335246T3 (es) 2010-03-23
DE602007002993D1 (de) 2009-12-10
US8059824B2 (en) 2011-11-15
US20090097663A1 (en) 2009-04-16
PL1994526T3 (pl) 2010-03-31

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