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GB8913758D0 - Polyphonic coding - Google Patents

Polyphonic coding

Info

Publication number
GB8913758D0
GB8913758D0 GB898913758A GB8913758A GB8913758D0 GB 8913758 D0 GB8913758 D0 GB 8913758D0 GB 898913758 A GB898913758 A GB 898913758A GB 8913758 A GB8913758 A GB 8913758A GB 8913758 D0 GB8913758 D0 GB 8913758D0
Authority
GB
United Kingdom
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.)
Pending
Application number
GB898913758A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Telecommunications PLC
Original Assignee
British Telecommunications PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10658483&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB8913758(D0) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by British Telecommunications PLC filed Critical British Telecommunications PLC
Priority to GB898913758A priority Critical patent/GB8913758D0/en
Publication of GB8913758D0 publication Critical patent/GB8913758D0/en
Priority to PCT/GB1990/000928 priority patent/WO1990016136A1/en
Priority to EP90909155A priority patent/EP0478615B2/en
Priority to ES90909155T priority patent/ES2071823T3/en
Priority to AU58379/90A priority patent/AU640667B2/en
Priority to DK90909155.5T priority patent/DK0478615T3/en
Priority to DE69018989T priority patent/DE69018989T3/en
Priority to AT90909155T priority patent/ATE121900T1/en
Priority to JP2508936A priority patent/JP2703405B2/en
Priority to CA002058984A priority patent/CA2058984C/en
Priority to FI915873A priority patent/FI915873A0/en
Priority to NO914947A priority patent/NO180030C/en
Priority to US08/109,479 priority patent/US5434948A/en
Priority to HK137196A priority patent/HK137196A/en
Pending legal-status Critical Current

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 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)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (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)
  • Stereophonic System (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (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.
GB898913758A 1989-06-15 1989-06-15 Polyphonic coding Pending GB8913758D0 (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
GB898913758A GB8913758D0 (en) 1989-06-15 1989-06-15 Polyphonic coding
CA002058984A CA2058984C (en) 1989-06-15 1990-06-15 Polyphonic coding
EP90909155A EP0478615B2 (en) 1989-06-15 1990-06-15 Polyphonic coding
DK90909155.5T DK0478615T3 (en) 1989-06-15 1990-06-15 Polyphonic coding
JP2508936A JP2703405B2 (en) 1989-06-15 1990-06-15 Polyphonic coding
ES90909155T ES2071823T3 (en) 1989-06-15 1990-06-15 POLYPHONIC CODING.
AU58379/90A AU640667B2 (en) 1989-06-15 1990-06-15 Polyphonic coding
PCT/GB1990/000928 WO1990016136A1 (en) 1989-06-15 1990-06-15 Polyphonic coding
DE69018989T DE69018989T3 (en) 1989-06-15 1990-06-15 POLYPHONIC CODING.
AT90909155T ATE121900T1 (en) 1989-06-15 1990-06-15 POLYPHONIC CODING.
FI915873A FI915873A0 (en) 1989-06-15 1991-12-13 POLYFON KODNING.
NO914947A NO180030C (en) 1989-06-15 1991-12-13 Polyphonic coding
US08/109,479 US5434948A (en) 1989-06-15 1993-08-20 Polyphonic coding
HK137196A HK137196A (en) 1989-06-15 1996-07-25 Polyphonic coding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB898913758A GB8913758D0 (en) 1989-06-15 1989-06-15 Polyphonic coding

Publications (1)

Publication Number Publication Date
GB8913758D0 true GB8913758D0 (en) 1989-08-02

Family

ID=10658483

Family Applications (1)

Application Number Title Priority Date Filing Date
GB898913758A Pending GB8913758D0 (en) 1989-06-15 1989-06-15 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)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
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
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
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
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
MX2007005261A (en) * 2004-11-04 2007-07-09 Koninkl Philips Electronics Nv 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
EP2264698A4 (en) * 2008-04-04 2012-06-13 Panasonic Corp STEREO SIGNAL CONVERTER, STEREO SIGNAL INVERTER AND METHODS THEREOF
KR101629862B1 (en) 2008-05-23 2016-06-24 코닌클리케 필립스 엔.브이. A 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
EP2556502B1 (en) * 2010-04-09 2018-12-26 Dolby International AB Mdct-based complex prediction stereo decoding
PL3779978T3 (en) 2010-04-13 2022-08-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method of decoding an encoded stereo audio signal 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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
EP0478615B1 (en) 1995-04-26
NO180030B (en) 1996-10-21
CA2058984C (en) 1998-12-01
NO180030C (en) 1997-01-29
CA2058984A1 (en) 1990-12-16
DE69018989T3 (en) 1998-11-19
NO914947D0 (en) 1991-12-13
EP0478615B2 (en) 1998-04-15
ES2071823T3 (en) 1995-07-01
AU640667B2 (en) 1993-09-02
DE69018989T2 (en) 1995-09-07
EP0478615A1 (en) 1992-04-08
JPH04506141A (en) 1992-10-22
DE69018989D1 (en) 1995-06-01
ATE121900T1 (en) 1995-05-15
FI915873A0 (en) 1991-12-13
WO1990016136A1 (en) 1990-12-27
HK137196A (en) 1996-08-02
DK0478615T3 (en) 1995-07-17
JP2703405B2 (en) 1998-01-26
NO914947L (en) 1992-02-13
AU5837990A (en) 1991-01-08

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