DE69018989T2 - POLYPHONIC CODING. - Google Patents
POLYPHONIC CODING.Info
- Publication number
- DE69018989T2 DE69018989T2 DE69018989T DE69018989T DE69018989T2 DE 69018989 T2 DE69018989 T2 DE 69018989T2 DE 69018989 T DE69018989 T DE 69018989T DE 69018989 T DE69018989 T DE 69018989T DE 69018989 T2 DE69018989 T2 DE 69018989T2
- Authority
- DE
- Germany
- Prior art keywords
- adaptive filter
- sum
- filter
- signal
- decoder
- 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 abstract 5
- 230000002087 whitening effect Effects 0.000 abstract 2
- 230000006978 adaptation Effects 0.000 abstract 1
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)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Health & Medical Sciences (AREA)
- Acoustics & Sound (AREA)
- Computational Linguistics (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)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Stereophonic System (AREA)
Abstract
A polyphonic (e.g. stereo) audioconferencing system, in which input left and right channels are time-aligned by variable delay stages (10a, 10b), controlled by a delay calculator (9) (e.g. by deriving the maximum cross-correlation value), and then summed in an adder (2) and subtracted in subtracter (3) to form sum and difference signals. The sum signal is transmitted in relatively high quality; the difference signal is reconstructed at the decoder by prediction from the sum signal using an adaptive filter (5). The decoder adaptive filter (5) is configured either by received filter coefficients or, using backwards adaptation, from a received residual signal produced by a corresponding adaptive filter (4) in the coder, or both. Preferably, the adaptive filter (4) is a lattice filter, employing a gradient algorithm for coefficient update. The complexity of the adaptive filter (4) is reduced by pre-whitening, in the encoder, both the sum and difference signals using corresponding whitening filters (14a, 14b) derived from the sum channel.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB898913758A GB8913758D0 (en) | 1989-06-15 | 1989-06-15 | Polyphonic coding |
PCT/GB1990/000928 WO1990016136A1 (en) | 1989-06-15 | 1990-06-15 | Polyphonic coding |
Publications (3)
Publication Number | Publication Date |
---|---|
DE69018989D1 DE69018989D1 (en) | 1995-06-01 |
DE69018989T2 true DE69018989T2 (en) | 1995-09-07 |
DE69018989T3 DE69018989T3 (en) | 1998-11-19 |
Family
ID=10658483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69018989T Expired - Lifetime DE69018989T3 (en) | 1989-06-15 | 1990-06-15 | POLYPHONIC CODING. |
Country Status (13)
Country | Link |
---|---|
EP (1) | EP0478615B2 (en) |
JP (1) | JP2703405B2 (en) |
AT (1) | ATE121900T1 (en) |
AU (1) | AU640667B2 (en) |
CA (1) | CA2058984C (en) |
DE (1) | DE69018989T3 (en) |
DK (1) | DK0478615T3 (en) |
ES (1) | ES2071823T3 (en) |
FI (1) | FI915873A0 (en) |
GB (1) | GB8913758D0 (en) |
HK (1) | HK137196A (en) |
NO (1) | NO180030C (en) |
WO (1) | WO1990016136A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19829284A1 (en) * | 1998-05-15 | 1999-11-18 | Fraunhofer Ges Forschung | Temporal stereo signal processing method for forming scaled bit stream |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SG49883A1 (en) * | 1991-01-08 | 1998-06-15 | Dolby Lab Licensing Corp | Encoder/decoder for multidimensional sound fields |
US5274740A (en) * | 1991-01-08 | 1993-12-28 | Dolby Laboratories Licensing Corporation | Decoder for variable number of channel presentation of multidimensional sound fields |
DE4136825C1 (en) * | 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 (en) * | 1993-01-27 | 2000-04-12 | Koninklijke Philips Electronics N.V. | Audio signal processing arrangement for deriving a centre channel signal and also an audio visual reproduction system comprising such a processing arrangement |
DE4320990B4 (en) * | 1993-06-05 | 2004-04-29 | Robert Bosch Gmbh | Redundancy reduction procedure |
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 (en) | 1995-07-20 | 1997-01-23 | Bosch Gmbh Robert | Redundancy reduction method for coding multichannel signals and device for decoding redundancy-reduced multichannel signals |
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 |
SE519552C2 (en) | 1998-09-30 | 2003-03-11 | Ericsson Telefon Ab L M | Multichannel signal coding and decoding |
SE519985C2 (en) * | 2000-09-15 | 2003-05-06 | Ericsson Telefon Ab L M | Coding and decoding of signals from multiple channels |
SE519976C2 (en) | 2000-09-15 | 2003-05-06 | Ericsson Telefon Ab L M | Coding and decoding of signals from multiple channels |
SE519981C2 (en) | 2000-09-15 | 2003-05-06 | Ericsson Telefon Ab L M | Coding and decoding of signals from multiple channels |
FR2821475B1 (en) * | 2001-02-23 | 2003-05-09 | France Telecom | METHOD AND DEVICE FOR SPECTRALLY RECONSTRUCTING MULTI-CHANNEL SIGNALS, ESPECIALLY STEREOPHONIC SIGNALS |
US7835918B2 (en) * | 2004-11-04 | 2010-11-16 | Koninklijke Philips Electronics N.V. | Encoding and decoding a set of signals |
CN103716748A (en) * | 2007-03-01 | 2014-04-09 | 杰里·马哈布比 | Audio spatialization and environment simulation |
CN101981616A (en) * | 2008-04-04 | 2011-02-23 | 松下电器产业株式会社 | Stereo signal converter, stereo signal reverse converter, and methods for both |
US8811621B2 (en) | 2008-05-23 | 2014-08-19 | Koninklijke Philips N.V. | Parametric stereo upmix apparatus, a parametric stereo decoder, a parametric stereo downmix apparatus, a parametric stereo encoder |
EP2375409A1 (en) * | 2010-04-09 | 2011-10-12 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio encoder, audio decoder and related methods for processing multi-channel audio signals using complex prediction |
KR101437896B1 (en) | 2010-04-09 | 2014-09-16 | 돌비 인터네셔널 에이비 | Mdct-based complex prediction stereo coding |
AU2011240239B2 (en) | 2010-04-13 | 2014-06-26 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Audio or video encoder, audio or video decoder and related methods for processing multi-channel audio or video signals using a variable prediction direction |
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 (en) * | 1986-04-10 | 1995-06-28 | 株式会社東芝 | Stereo audio transmission storage method |
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 ES ES90909155T patent/ES2071823T3/en not_active Expired - Lifetime
- 1990-06-15 EP EP90909155A patent/EP0478615B2/en not_active Expired - Lifetime
- 1990-06-15 DE DE69018989T patent/DE69018989T3/en not_active Expired - Lifetime
- 1990-06-15 DK DK90909155.5T patent/DK0478615T3/en active
- 1990-06-15 CA CA002058984A patent/CA2058984C/en not_active Expired - Lifetime
- 1990-06-15 JP JP2508936A patent/JP2703405B2/en not_active Expired - Lifetime
- 1990-06-15 WO PCT/GB1990/000928 patent/WO1990016136A1/en active IP Right Grant
- 1990-06-15 AT AT90909155T patent/ATE121900T1/en not_active IP Right Cessation
- 1990-06-15 AU AU58379/90A patent/AU640667B2/en not_active Ceased
-
1991
- 1991-12-13 FI FI915873A patent/FI915873A0/en unknown
- 1991-12-13 NO NO914947A patent/NO180030C/en unknown
-
1996
- 1996-07-25 HK HK137196A patent/HK137196A/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19829284A1 (en) * | 1998-05-15 | 1999-11-18 | Fraunhofer Ges Forschung | Temporal stereo signal processing method for forming scaled bit stream |
DE19829284C2 (en) * | 1998-05-15 | 2000-03-16 | Fraunhofer Ges Forschung | Method and apparatus for processing a temporal stereo signal and method and apparatus for decoding an audio bit stream encoded using prediction over frequency |
Also Published As
Publication number | Publication date |
---|---|
CA2058984A1 (en) | 1990-12-16 |
EP0478615B2 (en) | 1998-04-15 |
ATE121900T1 (en) | 1995-05-15 |
NO914947L (en) | 1992-02-13 |
WO1990016136A1 (en) | 1990-12-27 |
NO180030B (en) | 1996-10-21 |
JP2703405B2 (en) | 1998-01-26 |
EP0478615A1 (en) | 1992-04-08 |
FI915873A0 (en) | 1991-12-13 |
DK0478615T3 (en) | 1995-07-17 |
HK137196A (en) | 1996-08-02 |
AU5837990A (en) | 1991-01-08 |
DE69018989D1 (en) | 1995-06-01 |
DE69018989T3 (en) | 1998-11-19 |
NO180030C (en) | 1997-01-29 |
JPH04506141A (en) | 1992-10-22 |
AU640667B2 (en) | 1993-09-02 |
NO914947D0 (en) | 1991-12-13 |
EP0478615B1 (en) | 1995-04-26 |
ES2071823T3 (en) | 1995-07-01 |
CA2058984C (en) | 1998-12-01 |
GB8913758D0 (en) | 1989-08-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES2071823T3 (en) | POLYPHONIC CODING. | |
US5434948A (en) | Polyphonic coding | |
KR100469002B1 (en) | Audio coding method and apparatus | |
JP4229586B2 (en) | Frame and basic audio coding with additional filter bank for aliasing suppression | |
JPS5912186B2 (en) | Predictive speech signal coding with reduced noise influence | |
CA2052250A1 (en) | Linear prediction speech coding with high-frequency preemphasis | |
JPH01273430A (en) | Differential encoder having self-compatibility estimating filter | |
KR100513815B1 (en) | Signal encoding method and apparatus | |
ATE150238T1 (en) | METHOD FOR PROCESSING A DIGITAL FREQUENCY MULTIPLEX SIGNAL AND ITS DEPARTMENT | |
US5588089A (en) | Bark amplitude component coder for a sampled analog signal and decoder for the coded signal | |
ATE122522T1 (en) | HYBRID PREDICTION ENCODER AND DECODER FOR DIGITAL VIDEO SIGNALS. | |
DE3478065D1 (en) | Method and apparatus for coding digital signals | |
CA1308193C (en) | Multi-pulse coding system | |
FR2596893B1 (en) | DEVICE FOR IMPLEMENTING A LEROUX-GUEGUEN ALGORITHM FOR CODING A SIGNAL BY LINEAR PREDICTION | |
JPH058839B2 (en) | ||
JPS5911027A (en) | Adaptive differential pcm system | |
GB2322776A (en) | Backward adaptive prediction of audio signals | |
CA2238021A1 (en) | Dsp decoder for decoding analog sr encoded audio signals | |
KR960012478B1 (en) | Adaptable ms-stereo digital audio coder & decoder | |
Itakura et al. | Musashino Electrical Communication Laboratory, NTT Musashino, Tokyo, Japan | |
JPH0451300A (en) | Linear predictive encoder and decoder | |
JPH04162100A (en) | Multiple pulse type voice coding-decoding device | |
DK417184D0 (en) | PROCEDURE AND APPARATUS FOR DETERMINING COEFFICIENTS FOR LINEAR PREDICTIVE CODING | |
JPH01160225A (en) | Method for transmitting digital data by predictive coding |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8363 | Opposition against the patent | ||
8366 | Restricted maintained after opposition proceedings |