EP1994526B1 - Synthese et spatialisation sonores conjointes - Google Patents
Synthese et spatialisation sonores conjointes Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- spatialization
- parameters
- source
- channel
- frequency component
- 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.)
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Links
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 44
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 41
- 230000003595 spectral effect Effects 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 6
- 230000015654 memory Effects 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 2
- 230000003936 working memory Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 241000861223 Issus Species 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 244000236931 Cydonia oblonga Species 0.000 description 1
- 241001362574 Decodes Species 0.000 description 1
- 241000897276 Termes Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
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- 238000001308 synthesis method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC 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
- G10H7/00—Instruments in which the tones are synthesised from a data store, e.g. computer organs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC 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
- G10H2210/00—Aspects 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
- G10H2210/155—Musical effects
- G10H2210/265—Acoustic effect simulation, i.e. volume, spatial, resonance or reverberation effects added to a musical sound, usually by appropriate filtering or delays
- G10H2210/295—Spatial effects, musical uses of multiple audio channels, e.g. stereo
- G10H2210/301—Soundscape or sound field simulation, reproduction or control for musical purposes, e.g. surround or 3D sound; Granular synthesis
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- 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
- H04R2499/11—Transducers 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)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Stereophonic System (AREA)
- Golf Clubs (AREA)
- Circuit For Audible Band Transducer (AREA)
- Telephone Set Structure (AREA)
- Telephone Function (AREA)
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)
Publication Number | Publication Date |
---|---|
EP1994526A1 EP1994526A1 (fr) | 2008-11-26 |
EP1994526B1 true EP1994526B1 (fr) | 2009-10-28 |
Family
ID=37400911
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07731685A Active EP1994526B1 (fr) | 2006-03-13 | 2007-03-01 | Synthese et spatialisation sonores conjointes |
Country Status (8)
Country | Link |
---|---|
US (1) | US8059824B2 (ja) |
EP (1) | EP1994526B1 (ja) |
JP (1) | JP5051782B2 (ja) |
AT (1) | ATE447224T1 (ja) |
DE (1) | DE602007002993D1 (ja) |
ES (1) | ES2335246T3 (ja) |
PL (1) | PL1994526T3 (ja) |
WO (1) | WO2007104877A1 (ja) |
Families Citing this family (4)
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 |
WO2018067060A1 (en) * | 2016-10-04 | 2018-04-12 | Aditus Science Ab | Stereo unfold technology |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2679689B1 (fr) * | 1991-07-26 | 1994-02-25 | Etat Francais | Procede de synthese de sons. |
JPH08502867A (ja) | 1992-10-29 | 1996-03-26 | ウィスコンシン アラムニ リサーチ ファンデーション | 指向性音を作る方法及び装置 |
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 |
AU2007271532B2 (en) * | 2006-07-07 | 2011-03-17 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Apparatus and method for combining multiple parametrically coded audio sources |
CN101681625B (zh) * | 2007-06-08 | 2012-11-07 | 杜比实验室特许公司 | 用于从两个输入的音频信号获得两个环绕声音频通道的方法和设备 |
-
2007
- 2007-03-01 WO PCT/FR2007/050868 patent/WO2007104877A1/fr active Application Filing
- 2007-03-01 US US12/225,097 patent/US8059824B2/en active Active
- 2007-03-01 DE DE602007002993T patent/DE602007002993D1/de active Active
- 2007-03-01 JP JP2008558857A patent/JP5051782B2/ja active Active
- 2007-03-01 ES ES07731685T patent/ES2335246T3/es active Active
- 2007-03-01 PL PL07731685T patent/PL1994526T3/pl unknown
- 2007-03-01 AT AT07731685T patent/ATE447224T1/de not_active IP Right Cessation
- 2007-03-01 EP EP07731685A patent/EP1994526B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
ATE447224T1 (de) | 2009-11-15 |
JP5051782B2 (ja) | 2012-10-17 |
DE602007002993D1 (de) | 2009-12-10 |
WO2007104877A1 (fr) | 2007-09-20 |
JP2009530883A (ja) | 2009-08-27 |
EP1994526A1 (fr) | 2008-11-26 |
ES2335246T3 (es) | 2010-03-23 |
US20090097663A1 (en) | 2009-04-16 |
US8059824B2 (en) | 2011-11-15 |
PL1994526T3 (pl) | 2010-03-31 |
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