NO914947L - POLYPHONIC CODING - Google Patents

POLYPHONIC CODING

Info

Publication number
NO914947L
NO914947L NO91914947A NO914947A NO914947L NO 914947 L NO914947 L NO 914947L NO 91914947 A NO91914947 A NO 91914947A NO 914947 A NO914947 A NO 914947A NO 914947 L NO914947 L NO 914947L
Authority
NO
Norway
Prior art keywords
adaptive filter
sum
filter
signal
decoder
Prior art date
Application number
NO91914947A
Other languages
Norwegian (no)
Other versions
NO180030B (en
NO914947D0 (en
NO180030C (en
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=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=NO914947(L) "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 NO914947D0 publication Critical patent/NO914947D0/en
Publication of NO914947L publication Critical patent/NO914947L/en
Publication of NO180030B publication Critical patent/NO180030B/en
Publication of NO180030C publication Critical patent/NO180030C/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)
  • 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

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.
NO914947A 1989-06-15 1991-12-13 Polyphonic coding NO180030C (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 (4)

Publication Number Publication Date
NO914947D0 NO914947D0 (en) 1991-12-13
NO914947L true NO914947L (en) 1992-02-13
NO180030B NO180030B (en) 1996-10-21
NO180030C NO180030C (en) 1997-01-29

Family

ID=10658483

Family Applications (1)

Application Number Title Priority Date Filing Date
NO914947A NO180030C (en) 1989-06-15 1991-12-13 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
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 (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
SE519976C2 (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
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.
EP2119306A4 (en) * 2007-03-01 2012-04-25 Jerry Mahabub 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
BR122020009727B1 (en) 2008-05-23 2021-04-06 Koninklijke Philips N.V. METHOD
RU2559899C2 (en) 2010-04-09 2015-08-20 Долби Интернешнл Аб Mdct-based complex prediction 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
BR112012026324B1 (en) 2010-04-13 2021-08-17 Fraunhofer - Gesellschaft Zur Förderung Der Angewandten Forschung E. V AUDIO OR VIDEO ENCODER, AUDIO OR VIDEO ENCODER AND RELATED METHODS FOR MULTICHANNEL AUDIO OR VIDEO SIGNAL PROCESSING USING A VARIABLE FORECAST 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
ATE121900T1 (en) 1995-05-15
EP0478615B1 (en) 1995-04-26
DE69018989T3 (en) 1998-11-19
HK137196A (en) 1996-08-02
AU5837990A (en) 1991-01-08
NO180030B (en) 1996-10-21
DE69018989D1 (en) 1995-06-01
DE69018989T2 (en) 1995-09-07
NO914947D0 (en) 1991-12-13
NO180030C (en) 1997-01-29
FI915873A0 (en) 1991-12-13
CA2058984A1 (en) 1990-12-16
AU640667B2 (en) 1993-09-02
CA2058984C (en) 1998-12-01
EP0478615B2 (en) 1998-04-15
JP2703405B2 (en) 1998-01-26
WO1990016136A1 (en) 1990-12-27
JPH04506141A (en) 1992-10-22
DK0478615T3 (en) 1995-07-17
ES2071823T3 (en) 1995-07-01
GB8913758D0 (en) 1989-08-02
EP0478615A1 (en) 1992-04-08

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