CA2058984C - Codage polyphonique - Google Patents
Codage polyphoniqueInfo
- Publication number
- CA2058984C CA2058984C CA002058984A CA2058984A CA2058984C CA 2058984 C CA2058984 C CA 2058984C CA 002058984 A CA002058984 A CA 002058984A CA 2058984 A CA2058984 A CA 2058984A CA 2058984 C CA2058984 C CA 2058984C
- Authority
- CA
- Canada
- Prior art keywords
- filter
- signal
- channel
- sum
- difference
- 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.)
- Expired - Lifetime
Links
- 230000003044 adaptive effect Effects 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims description 18
- 230000003595 spectral effect Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000011144 upstream manufacturing Methods 0.000 claims 2
- 230000002087 whitening effect Effects 0.000 abstract description 13
- 230000006978 adaptation Effects 0.000 abstract description 7
- 230000002829 reductive effect Effects 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 12
- 230000008901 benefit Effects 0.000 description 6
- 230000001934 delay Effects 0.000 description 5
- 230000001364 causal effect Effects 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000009795 derivation Methods 0.000 description 3
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- 238000001228 spectrum Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
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- 230000008859 change Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 241000490229 Eucephalus Species 0.000 description 1
- 102000020897 Formins Human genes 0.000 description 1
- 108091022623 Formins Proteins 0.000 description 1
- RJKFOVLPORLFTN-LEKSSAKUSA-N Progesterone Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H](C(=O)C)[C@@]1(C)CC2 RJKFOVLPORLFTN-LEKSSAKUSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 238000013383 initial experiment Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/86—Arrangements characterised by the broadcast information itself
- H04H20/88—Stereophonic broadcast systems
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Human Computer Interaction (AREA)
- Health & Medical Sciences (AREA)
- Acoustics & Sound (AREA)
- Computational Linguistics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Mathematical Physics (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Stereophonic System (AREA)
Abstract
L'invention est un système audioconférence polyphonique (stéréophonique par exemple) dans lequel les canaux d'entrée gauche et droit sont ordonnancés temporellement par des étages à retardement variable (10a, 10b) et contrôlés par un calculateur de retard (9) (lequel, par exemple, peut effectuer ce contrôle en déterminant la corrélation maximale) et les signaux de ces canaux sont sommés dans un additionneur (2) et soustraits dans un soustracteur (3) pour former les signaux de somme et de différence. Le signal de somme est transmis avec une qualité relativement élevée; le signal de différence est reconstruit au décodeur à partir de prédictions fournies par le signal de somme, en utilisant un filtre adaptatif (5). Le filtre adaptatif (5) du décodeur est configuré par les coefficients de filtrage reçus ou, à l'aide d'une adaptation inverse, à partir d'un signal résiduel reçu qui est produit par un filtre adaptatif correspondant (4) dans le codeur, ou de ces deux façons. Dans la concrétisation privilégiée de l'invention, ce filtre adaptatif (4) est un filtre en treillis qui utilise un algorithme à gradient pour la mise à jour des coefficients. La complexité du filtre adaptatif (4) est réduite en préblanchissant dans le codeur les signaux de somme et de différence au moyen de filtres de blanchissement correspondants (14a, 14b) obtenus du canal du signal de somme.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8913758.2 | 1989-06-15 | ||
| GB898913758A GB8913758D0 (en) | 1989-06-15 | 1989-06-15 | Polyphonic coding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2058984A1 CA2058984A1 (fr) | 1990-12-16 |
| CA2058984C true CA2058984C (fr) | 1998-12-01 |
Family
ID=10658483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002058984A Expired - Lifetime CA2058984C (fr) | 1989-06-15 | 1990-06-15 | Codage polyphonique |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0478615B2 (fr) |
| JP (1) | JP2703405B2 (fr) |
| AT (1) | ATE121900T1 (fr) |
| AU (1) | AU640667B2 (fr) |
| CA (1) | CA2058984C (fr) |
| DE (1) | DE69018989T3 (fr) |
| DK (1) | DK0478615T3 (fr) |
| ES (1) | ES2071823T3 (fr) |
| FI (1) | FI915873A0 (fr) |
| GB (1) | GB8913758D0 (fr) |
| HK (1) | HK137196A (fr) |
| NO (1) | NO180030C (fr) |
| WO (1) | WO1990016136A1 (fr) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5274740A (en) * | 1991-01-08 | 1993-12-28 | Dolby Laboratories Licensing Corporation | Decoder for variable number of channel presentation of multidimensional sound fields |
| AU653582B2 (en) * | 1991-01-08 | 1994-10-06 | Dolby Laboratories Licensing Corporation | Encoder/decoder for multidimensional sound fields |
| DE4136825C1 (fr) * | 1991-11-08 | 1993-03-18 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De | |
| US5278909A (en) * | 1992-06-08 | 1994-01-11 | International Business Machines Corporation | System and method for stereo digital audio compression with co-channel steering |
| EP0608937B1 (fr) * | 1993-01-27 | 2000-04-12 | Koninklijke Philips Electronics N.V. | Dispositif de traitement de signaux audio pour dériver un signal de canal central et système de reproduction audiovisuelle comprenant un tel dispositif de traitement |
| DE4320990B4 (de) * | 1993-06-05 | 2004-04-29 | Robert Bosch Gmbh | Verfahren zur Redundanzreduktion |
| US5488665A (en) * | 1993-11-23 | 1996-01-30 | At&T Corp. | Multi-channel perceptual audio compression system with encoding mode switching among matrixed channels |
| DE19526366A1 (de) | 1995-07-20 | 1997-01-23 | Bosch Gmbh Robert | Verfahren zur Redundanzreduktion bei der Codierung von mehrkanaligen Signalen und Vorrichtung zur Dekodierung von redundanzreduzierten, mehrkanaligen Signalen |
| GB2303516A (en) * | 1995-07-20 | 1997-02-19 | Plessey Telecomm | Teleconferencing |
| US6016473A (en) * | 1998-04-07 | 2000-01-18 | Dolby; Ray M. | Low bit-rate spatial coding method and system |
| DE19829284C2 (de) * | 1998-05-15 | 2000-03-16 | Fraunhofer Ges Forschung | Verfahren und Vorrichtung zum Verarbeiten eines zeitlichen Stereosignals und Verfahren und Vorrichtung zum Decodieren eines unter Verwendung einer Prädiktion über der Frequenz codierten Audiobitstroms |
| SE519552C2 (sv) * | 1998-09-30 | 2003-03-11 | Ericsson Telefon Ab L M | Flerkanalig signalkodning och -avkodning |
| SE519976C2 (sv) | 2000-09-15 | 2003-05-06 | Ericsson Telefon Ab L M | Kodning och avkodning av signaler från flera kanaler |
| SE519985C2 (sv) * | 2000-09-15 | 2003-05-06 | Ericsson Telefon Ab L M | Kodning och avkodning av signaler från flera kanaler |
| SE519981C2 (sv) * | 2000-09-15 | 2003-05-06 | Ericsson Telefon Ab L M | Kodning och avkodning av signaler från flera kanaler |
| FR2821475B1 (fr) * | 2001-02-23 | 2003-05-09 | France Telecom | Procede et dispositif de reconstruction spectrale de signaux a plusieurs voies, notamment de signaux stereophoniques |
| MX2007005261A (es) * | 2004-11-04 | 2007-07-09 | Koninkl Philips Electronics Nv | Codificacion y descodificacion de un conjunto de senales. |
| EP2119306A4 (fr) * | 2007-03-01 | 2012-04-25 | Jerry Mahabub | Spatialisation audio et simulation d'environnement |
| CN101981616A (zh) * | 2008-04-04 | 2011-02-23 | 松下电器产业株式会社 | 立体声信号变换装置、立体声信号逆变换装置及其方法 |
| BR122020009727B1 (pt) | 2008-05-23 | 2021-04-06 | Koninklijke Philips N.V. | Método |
| RU2559899C2 (ru) | 2010-04-09 | 2015-08-20 | Долби Интернешнл Аб | Стереофоническое кодирование на основе mdct с комплексным предсказанием |
| EP2375409A1 (fr) | 2010-04-09 | 2011-10-12 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Codeur audio, décodeur audio et procédés connexes pour le traitement de signaux audio multicanaux au moyen d'une prédiction complexe |
| BR112012026324B1 (pt) | 2010-04-13 | 2021-08-17 | Fraunhofer - Gesellschaft Zur Förderung Der Angewandten Forschung E. V | Codificador de aúdio ou vídeo, decodificador de aúdio ou vídeo e métodos relacionados para o processamento do sinal de aúdio ou vídeo de múltiplos canais usando uma direção de previsão variável |
| UA107771C2 (en) * | 2011-09-29 | 2015-02-10 | Dolby Int Ab | Prediction-based fm stereo radio noise reduction |
| US9380387B2 (en) | 2014-08-01 | 2016-06-28 | Klipsch Group, Inc. | Phase independent surround speaker |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU546069B2 (en) * | 1981-09-07 | 1985-08-15 | Kahn, Leonard Richard | Am stereo distortion correction |
| JPH0761043B2 (ja) * | 1986-04-10 | 1995-06-28 | 株式会社東芝 | ステレオ音声伝送蓄積方式 |
| GB8628046D0 (en) * | 1986-11-24 | 1986-12-31 | British Telecomm | Transmission system |
-
1989
- 1989-06-15 GB GB898913758A patent/GB8913758D0/en active Pending
-
1990
- 1990-06-15 AU AU58379/90A patent/AU640667B2/en not_active Ceased
- 1990-06-15 DE DE69018989T patent/DE69018989T3/de not_active Expired - Lifetime
- 1990-06-15 WO PCT/GB1990/000928 patent/WO1990016136A1/fr active IP Right Grant
- 1990-06-15 AT AT90909155T patent/ATE121900T1/de not_active IP Right Cessation
- 1990-06-15 EP EP90909155A patent/EP0478615B2/fr not_active Expired - Lifetime
- 1990-06-15 DK DK90909155.5T patent/DK0478615T3/da active
- 1990-06-15 ES ES90909155T patent/ES2071823T3/es not_active Expired - Lifetime
- 1990-06-15 JP JP2508936A patent/JP2703405B2/ja not_active Expired - Lifetime
- 1990-06-15 CA CA002058984A patent/CA2058984C/fr not_active Expired - Lifetime
-
1991
- 1991-12-13 FI FI915873A patent/FI915873A0/fi unknown
- 1991-12-13 NO NO914947A patent/NO180030C/no unknown
-
1996
- 1996-07-25 HK HK137196A patent/HK137196A/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE121900T1 (de) | 1995-05-15 |
| EP0478615B1 (fr) | 1995-04-26 |
| DE69018989T3 (de) | 1998-11-19 |
| HK137196A (en) | 1996-08-02 |
| AU5837990A (en) | 1991-01-08 |
| NO180030B (no) | 1996-10-21 |
| DE69018989D1 (de) | 1995-06-01 |
| DE69018989T2 (de) | 1995-09-07 |
| NO914947D0 (no) | 1991-12-13 |
| NO180030C (no) | 1997-01-29 |
| FI915873A0 (fi) | 1991-12-13 |
| CA2058984A1 (fr) | 1990-12-16 |
| NO914947L (no) | 1992-02-13 |
| AU640667B2 (en) | 1993-09-02 |
| EP0478615B2 (fr) | 1998-04-15 |
| JP2703405B2 (ja) | 1998-01-26 |
| WO1990016136A1 (fr) | 1990-12-27 |
| JPH04506141A (ja) | 1992-10-22 |
| DK0478615T3 (da) | 1995-07-17 |
| ES2071823T3 (es) | 1995-07-01 |
| GB8913758D0 (en) | 1989-08-02 |
| EP0478615A1 (fr) | 1992-04-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 20100615 |