SE0400415L - Coding of polyphonic signals with conditional filters - Google Patents

Coding of polyphonic signals with conditional filters

Info

Publication number
SE0400415L
SE0400415L SE0400415A SE0400415A SE0400415L SE 0400415 L SE0400415 L SE 0400415L SE 0400415 A SE0400415 A SE 0400415A SE 0400415 A SE0400415 A SE 0400415A SE 0400415 L SE0400415 L SE 0400415L
Authority
SE
Sweden
Prior art keywords
constraint
signal
adaptive filters
coding
mono signal
Prior art date
Application number
SE0400415A
Other languages
Swedish (sv)
Other versions
SE527713C2 (en
SE0400415D0 (en
Inventor
Anisse Taleb
Stefan Bruhn
Ingemar Johansson
Patrik Sandgren
Original Assignee
Ericsson Telefon Ab L M
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
Priority claimed from SE0303499A external-priority patent/SE0303499D0/en
Application filed by Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE0400415A priority Critical patent/SE527713C2/en
Publication of SE0400415D0 publication Critical patent/SE0400415D0/en
Priority to PL04809080T priority patent/PL1639580T3/en
Priority to ES04809080.7T priority patent/ES2439693T3/en
Priority to EP12154099A priority patent/EP2456236A1/en
Priority to JP2006518597A priority patent/JP4323520B2/en
Priority to US11/011,764 priority patent/US7725324B2/en
Priority to EP04809080.7A priority patent/EP1639580B1/en
Priority to DK04809080.7T priority patent/DK1639580T3/en
Priority to PCT/SE2004/001907 priority patent/WO2005059901A1/en
Priority to PT48090807T priority patent/PT1639580E/en
Publication of SE0400415L publication Critical patent/SE0400415L/en
Publication of SE527713C2 publication Critical patent/SE527713C2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mathematical Physics (AREA)
  • Computational Linguistics (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

Signals of different channels (c 1 -c N ) are combined into one mono signal (x). A set of adaptive filters, preferably one for each channel (c 1 -c N ), is derived in a respective filter adaptation unit (30:1-30:N). When an adaptive filter is applied to the mono signal (x) it reconstructs the signal of the respective channel (c 1 -c N ) under a perceptual constraint. The perceptual constraint is a gain and/or shape constraint. The gain constraint allows the preservation of the relative energy between the channels (c 1 -c N ) while the shape constraint allows more stability by avoiding unnecessary filtering of spectral nulls. The transmitted parameters are the mono signal (x), in encoded form, and the parameters (p 1 -p N ) of the adaptive filters, preferably also encoded. The receiver reconstructs the signal of the different channels by applying the adaptive filters and possibly some additional post-processing.
SE0400415A 2003-12-19 2004-02-20 Coding of polyphonic signals with conditional filters SE527713C2 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
SE0400415A SE527713C2 (en) 2003-12-19 2004-02-20 Coding of polyphonic signals with conditional filters
PT48090807T PT1639580E (en) 2003-12-19 2004-12-15 Coding of multi-channel signals
PCT/SE2004/001907 WO2005059901A1 (en) 2003-12-19 2004-12-15 Constrained filter encoding of polyphonic signals
EP12154099A EP2456236A1 (en) 2003-12-19 2004-12-15 Constrained filter encoding of polyphonic signals
ES04809080.7T ES2439693T3 (en) 2003-12-19 2004-12-15 Multi-channel signal encoding
PL04809080T PL1639580T3 (en) 2003-12-19 2004-12-15 Coding of multi-channel signals
JP2006518597A JP4323520B2 (en) 2003-12-19 2004-12-15 Constrained filter coding of polyphonic signals
US11/011,764 US7725324B2 (en) 2003-12-19 2004-12-15 Constrained filter encoding of polyphonic signals
EP04809080.7A EP1639580B1 (en) 2003-12-19 2004-12-15 Coding of multi-channel signals
DK04809080.7T DK1639580T3 (en) 2003-12-19 2004-12-15 Multichannel coding

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0303499A SE0303499D0 (en) 2003-12-19 2003-12-19 Multi-channel coding using gain-shape constrained filters
SE0400415A SE527713C2 (en) 2003-12-19 2004-02-20 Coding of polyphonic signals with conditional filters

Publications (3)

Publication Number Publication Date
SE0400415D0 SE0400415D0 (en) 2004-02-20
SE0400415L true SE0400415L (en) 2005-06-20
SE527713C2 SE527713C2 (en) 2006-05-23

Family

ID=31996352

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0400415A SE527713C2 (en) 2003-12-19 2004-02-20 Coding of polyphonic signals with conditional filters

Country Status (8)

Country Link
EP (2) EP1639580B1 (en)
JP (1) JP4323520B2 (en)
DK (1) DK1639580T3 (en)
ES (1) ES2439693T3 (en)
PL (1) PL1639580T3 (en)
PT (1) PT1639580E (en)
SE (1) SE527713C2 (en)
WO (1) WO2005059901A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2008016098A1 (en) * 2006-08-04 2009-12-24 パナソニック株式会社 Stereo speech coding apparatus, stereo speech decoding apparatus, and methods thereof
WO2010042024A1 (en) * 2008-10-10 2010-04-15 Telefonaktiebolaget Lm Ericsson (Publ) Energy conservative multi-channel audio coding

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5434948A (en) 1989-06-15 1995-07-18 British Telecommunications Public Limited Company Polyphonic coding
NL9100173A (en) 1991-02-01 1992-09-01 Philips Nv SUBBAND CODING DEVICE, AND A TRANSMITTER EQUIPPED WITH THE CODING DEVICE.
US5285498A (en) * 1992-03-02 1994-02-08 At&T Bell Laboratories Method and apparatus for coding audio signals based on perceptual model
SE9700772D0 (en) 1997-03-03 1997-03-03 Ericsson Telefon Ab L M A high resolution post processing method for a speech decoder
WO2003009206A1 (en) * 2001-07-19 2003-01-30 Sungwoo Kim The system and operational method of mobile telecommunication device for electronic cash
WO2003009208A1 (en) * 2001-07-20 2003-01-30 Medical Research Group Method and apparatus for communicating between an ambulatory medical device and a control device via telemetry using randomized data
DE60311794T2 (en) 2002-04-22 2007-10-31 Koninklijke Philips Electronics N.V. SIGNAL SYNTHESIS

Also Published As

Publication number Publication date
EP1639580B1 (en) 2013-10-23
DK1639580T3 (en) 2014-01-13
JP2007527543A (en) 2007-09-27
JP4323520B2 (en) 2009-09-02
EP2456236A1 (en) 2012-05-23
SE527713C2 (en) 2006-05-23
WO2005059901A1 (en) 2005-06-30
PT1639580E (en) 2013-11-19
PL1639580T3 (en) 2014-04-30
ES2439693T3 (en) 2014-01-24
SE0400415D0 (en) 2004-02-20
EP1639580A1 (en) 2006-03-29

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