FI915873A0 - POLYFON KODNING. - Google Patents
POLYFON KODNING.Info
- Publication number
- FI915873A0 FI915873A0 FI915873A FI915873A FI915873A0 FI 915873 A0 FI915873 A0 FI 915873A0 FI 915873 A FI915873 A FI 915873A FI 915873 A FI915873 A FI 915873A FI 915873 A0 FI915873 A0 FI 915873A0
- Authority
- FI
- Finland
- Prior art keywords
- adaptive filter
- sum
- filter
- signal
- decoder
- Prior art date
Links
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 OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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 OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
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 (1)
Publication Number | Publication Date |
---|---|
FI915873A0 true FI915873A0 (en) | 1991-12-13 |
Family
ID=10658483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI915873A FI915873A0 (en) | 1989-06-15 | 1991-12-13 | POLYFON KODNING. |
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) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992012607A1 (en) * | 1991-01-08 | 1992-07-23 | Dolby Laboratories Licensing Corporation | 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 |
GB2303516A (en) * | 1995-07-20 | 1997-02-19 | Plessey Telecomm | Teleconferencing |
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 |
US6016473A (en) * | 1998-04-07 | 2000-01-18 | Dolby; Ray M. | Low bit-rate spatial coding method and system |
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 |
SE519552C2 (en) * | 1998-09-30 | 2003-03-11 | Ericsson Telefon Ab L M | Multichannel signal coding and decoding |
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 |
SE519985C2 (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 |
BRPI0517949B1 (en) * | 2004-11-04 | 2019-09-03 | Koninklijke Philips Nv | conversion device for converting a dominant signal, method of converting a dominant signal, and computer readable non-transient means |
JP5285626B2 (en) * | 2007-03-01 | 2013-09-11 | ジェリー・マハバブ | Speech spatialization and environmental simulation |
JPWO2009122757A1 (en) * | 2008-04-04 | 2011-07-28 | パナソニック株式会社 | Stereo signal conversion apparatus, stereo signal inverse conversion apparatus, and methods thereof |
RU2497204C2 (en) | 2008-05-23 | 2013-10-27 | Конинклейке Филипс Электроникс Н.В. | Parametric stereophonic upmix apparatus, parametric stereophonic decoder, parametric stereophonic downmix apparatus, parametric stereophonic encoder |
TR201901336T4 (en) | 2010-04-09 | 2019-02-21 | Dolby Int Ab | Mdct-based complex predictive stereo coding. |
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 |
ES2953084T3 (en) | 2010-04-13 | 2023-11-08 | Fraunhofer Ges Forschung | Audio decoder to process stereo audio 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 DK DK90909155.5T patent/DK0478615T3/en active
- 1990-06-15 EP EP90909155A patent/EP0478615B2/en not_active Expired - Lifetime
- 1990-06-15 CA CA002058984A patent/CA2058984C/en not_active Expired - Lifetime
- 1990-06-15 WO PCT/GB1990/000928 patent/WO1990016136A1/en active IP Right Grant
- 1990-06-15 AU AU58379/90A patent/AU640667B2/en not_active Ceased
- 1990-06-15 ES ES90909155T patent/ES2071823T3/en not_active Expired - Lifetime
- 1990-06-15 DE DE69018989T patent/DE69018989T3/en not_active Expired - Lifetime
- 1990-06-15 JP JP2508936A patent/JP2703405B2/en not_active Expired - Lifetime
- 1990-06-15 AT AT90909155T patent/ATE121900T1/en not_active IP Right Cessation
-
1991
- 1991-12-13 NO NO914947A patent/NO180030C/en unknown
- 1991-12-13 FI FI915873A patent/FI915873A0/en unknown
-
1996
- 1996-07-25 HK HK137196A patent/HK137196A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB8913758D0 (en) | 1989-08-02 |
DE69018989T2 (en) | 1995-09-07 |
CA2058984C (en) | 1998-12-01 |
CA2058984A1 (en) | 1990-12-16 |
ES2071823T3 (en) | 1995-07-01 |
EP0478615B1 (en) | 1995-04-26 |
NO914947D0 (en) | 1991-12-13 |
WO1990016136A1 (en) | 1990-12-27 |
HK137196A (en) | 1996-08-02 |
AU5837990A (en) | 1991-01-08 |
AU640667B2 (en) | 1993-09-02 |
ATE121900T1 (en) | 1995-05-15 |
DE69018989T3 (en) | 1998-11-19 |
NO180030B (en) | 1996-10-21 |
JPH04506141A (en) | 1992-10-22 |
NO914947L (en) | 1992-02-13 |
EP0478615A1 (en) | 1992-04-08 |
NO180030C (en) | 1997-01-29 |
EP0478615B2 (en) | 1998-04-15 |
JP2703405B2 (en) | 1998-01-26 |
DK0478615T3 (en) | 1995-07-17 |
DE69018989D1 (en) | 1995-06-01 |
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