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
Application number
FI915873A
Other languages
Finnish (fi)
Inventor
Christopher Ellis Holt
Edward Munday
Barry Michael George Cheetham
Original Assignee
British Telecomm
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=FI915873(A0) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by British Telecomm filed Critical British Telecomm
Publication of FI915873A0 publication Critical patent/FI915873A0/en

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)
  • 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.
FI915873A 1989-06-15 1991-12-13 POLYFON KODNING. FI915873A0 (en)

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)

* Cited by examiner, † Cited by third party
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
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
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)

* 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
CA2058984A1 (en) 1990-12-16
EP0478615B2 (en) 1998-04-15
ATE121900T1 (en) 1995-05-15
NO914947L (en) 1992-02-13
DE69018989T2 (en) 1995-09-07
WO1990016136A1 (en) 1990-12-27
NO180030B (en) 1996-10-21
JP2703405B2 (en) 1998-01-26
EP0478615A1 (en) 1992-04-08
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

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