SE0400415D0 - Constrained filter encoding of polyphonic signals - Google Patents
Constrained filter encoding of polyphonic signalsInfo
- Publication number
- SE0400415D0 SE0400415D0 SE0400415A SE0400415A SE0400415D0 SE 0400415 D0 SE0400415 D0 SE 0400415D0 SE 0400415 A SE0400415 A SE 0400415A SE 0400415 A SE0400415 A SE 0400415A SE 0400415 D0 SE0400415 D0 SE 0400415D0
- Authority
- SE
- Sweden
- Prior art keywords
- constraint
- signal
- adaptive filters
- mono signal
- gain
- Prior art date
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 OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
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.
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 |
PL04809080T PL1639580T3 (en) | 2003-12-19 | 2004-12-15 | Coding of multi-channel signals |
EP12154099A EP2456236A1 (en) | 2003-12-19 | 2004-12-15 | Constrained filter encoding of polyphonic signals |
PCT/SE2004/001907 WO2005059901A1 (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 |
PT48090807T PT1639580E (en) | 2003-12-19 | 2004-12-15 | Coding of multi-channel signals |
ES04809080.7T ES2439693T3 (en) | 2003-12-19 | 2004-12-15 | Multi-channel signal encoding |
DK04809080.7T DK1639580T3 (en) | 2003-12-19 | 2004-12-15 | Multichannel coding |
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 |
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 true SE0400415D0 (en) | 2004-02-20 |
SE0400415L 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) | EP2456236A1 (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)
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)
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 |
ATE354161T1 (en) | 2002-04-22 | 2007-03-15 | Koninkl Philips Electronics Nv | SIGNAL SYNTHESIS |
-
2004
- 2004-02-20 SE SE0400415A patent/SE527713C2/en unknown
- 2004-12-15 ES ES04809080.7T patent/ES2439693T3/en active Active
- 2004-12-15 PL PL04809080T patent/PL1639580T3/en unknown
- 2004-12-15 EP EP12154099A patent/EP2456236A1/en not_active Ceased
- 2004-12-15 JP JP2006518597A patent/JP4323520B2/en not_active Expired - Fee Related
- 2004-12-15 PT PT48090807T patent/PT1639580E/en unknown
- 2004-12-15 DK DK04809080.7T patent/DK1639580T3/en active
- 2004-12-15 WO PCT/SE2004/001907 patent/WO2005059901A1/en not_active Application Discontinuation
- 2004-12-15 EP EP04809080.7A patent/EP1639580B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2456236A1 (en) | 2012-05-23 |
SE0400415L (en) | 2005-06-20 |
DK1639580T3 (en) | 2014-01-13 |
JP4323520B2 (en) | 2009-09-02 |
ES2439693T3 (en) | 2014-01-24 |
WO2005059901A1 (en) | 2005-06-30 |
PT1639580E (en) | 2013-11-19 |
JP2007527543A (en) | 2007-09-27 |
EP1639580A1 (en) | 2006-03-29 |
PL1639580T3 (en) | 2014-04-30 |
EP1639580B1 (en) | 2013-10-23 |
SE527713C2 (en) | 2006-05-23 |
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