HK137196A - Polyphonic coding - Google Patents

Polyphonic coding

Info

Publication number
HK137196A
HK137196A HK137196A HK137196A HK137196A HK 137196 A HK137196 A HK 137196A HK 137196 A HK137196 A HK 137196A HK 137196 A HK137196 A HK 137196A HK 137196 A HK137196 A HK 137196A
Authority
HK
Hong Kong
Prior art keywords
adaptive filter
sum
filter
signal
decoder
Prior art date
Application number
HK137196A
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=HK137196(A) "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 HK137196A publication Critical patent/HK137196A/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)
  • 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)
  • 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.
HK137196A 1989-06-15 1996-07-25 Polyphonic coding HK137196A (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
HK137196A true HK137196A (en) 1996-08-02

Family

ID=10658483

Family Applications (1)

Application Number Title Priority Date Filing Date
HK137196A HK137196A (en) 1989-06-15 1996-07-25 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
CA2077662C (en) * 1991-01-08 2001-04-17 Mark Franklin Davis 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
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
SE519976C2 (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
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
ES2810824T3 (en) 2010-04-09 2021-03-09 Dolby Int Ab Decoder system, decoding method and respective software
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
BR122020024855B1 (en) * 2010-04-13 2021-03-30 Fraunhofer - Gesellschaft Zur Forderung Der Angewandten Forschung E. V. AUDIO OR VIDEO ENCODER, AUDIO OR VIDEO DECODER AND RELATED METHODS FOR PROCESSING THE AUDIO OR VIDEO SIGNAL OF MULTIPLE CHANNELS 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
NO180030C (en) 1997-01-29
GB8913758D0 (en) 1989-08-02
ATE121900T1 (en) 1995-05-15
DE69018989T3 (en) 1998-11-19
FI915873A0 (en) 1991-12-13
DE69018989D1 (en) 1995-06-01
EP0478615B1 (en) 1995-04-26
WO1990016136A1 (en) 1990-12-27
NO180030B (en) 1996-10-21
CA2058984A1 (en) 1990-12-16
DK0478615T3 (en) 1995-07-17
EP0478615A1 (en) 1992-04-08
CA2058984C (en) 1998-12-01
AU5837990A (en) 1991-01-08
JPH04506141A (en) 1992-10-22
NO914947D0 (en) 1991-12-13
ES2071823T3 (en) 1995-07-01
JP2703405B2 (en) 1998-01-26
AU640667B2 (en) 1993-09-02
NO914947L (en) 1992-02-13
EP0478615B2 (en) 1998-04-15
DE69018989T2 (en) 1995-09-07

Similar Documents

Publication Publication Date Title
HK137196A (en) Polyphonic coding
US5434948A (en) Polyphonic coding
KR100469002B1 (en) Audio coding method and apparatus
CA2197128A1 (en) Enhanced Joint Stereo Coding Method Using Temporal Envelope Shaping
JPS5912186B2 (en) Predictive speech signal coding with reduced noise influence
CA2052250A1 (en) Linear prediction speech coding with high-frequency preemphasis
DK0611516T3 (en) Method of reducing data by transmitting and / or storing digital signals from several interdependent channels
EP0271166A3 (en) Digital circuit arrangement for reducing the quantizing noise
JPH01273430A (en) Differential encoder having self-compatibility estimating filter
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
CA2238069A1 (en) Audio noise reduction system implemented through digital signal processing
CA1308193C (en) Multi-pulse coding system
WO1995024776A3 (en) Transmission system for quasi-periodic signals
JPS5911027A (en) Adaptive differential pcm system
CA2238021A1 (en) Dsp decoder for decoding analog sr encoded audio signals
KR960012478B1 (en) Adaptable ms-stereo digital audio coder & decoder
Bae et al. On the predictor for the waveform coding of speech signals by using the dual first order difference values
Itakura et al. Musashino Electrical Communication Laboratory, NTT Musashino, Tokyo, Japan
JPH0675598A (en) Voice coding method and voice synthesis method
JPH0531331B2 (en)
JPS6441386A (en) Image encoder
JPH04162100A (en) Multiple pulse type voice coding-decoding device

Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)