WO2006091151B1 - Optimized fidelity and reduced signaling in multi-channel audio encoding - Google Patents

Optimized fidelity and reduced signaling in multi-channel audio encoding

Info

Publication number
WO2006091151B1
WO2006091151B1 PCT/SE2006/000235 SE2006000235W WO2006091151B1 WO 2006091151 B1 WO2006091151 B1 WO 2006091151B1 SE 2006000235 W SE2006000235 W SE 2006000235W WO 2006091151 B1 WO2006091151 B1 WO 2006091151B1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
encoding
sub
length
combination
Prior art date
Application number
PCT/SE2006/000235
Other languages
French (fr)
Other versions
WO2006091151A1 (en
Inventor
Anisse Taleb
Stefan Andersson
Original Assignee
Ericsson Telefon Ab L M
Anisse Taleb
Stefan Andersson
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 PCT/SE2005/002033 external-priority patent/WO2006091139A1/en
Application filed by Ericsson Telefon Ab L M, Anisse Taleb, Stefan Andersson filed Critical Ericsson Telefon Ab L M
Priority to AT06716925T priority Critical patent/ATE518313T1/en
Priority to CN2006800056509A priority patent/CN101128866B/en
Priority to EP06716925A priority patent/EP1856688B1/en
Priority to JP2007556114A priority patent/JP5171269B2/en
Publication of WO2006091151A1 publication Critical patent/WO2006091151A1/en
Publication of WO2006091151B1 publication Critical patent/WO2006091151B1/en

Links

Classifications

    • 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
    • G10L19/16—Vocoder architecture
    • G10L19/18—Vocoders using multiple modes
    • G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding

Landscapes

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

Abstract

The invention provides an efficient technique for encoding a multi-channel audio signal. The invention relies on the principle of encoding (Sl) a signal representation of one or more of the multiple channels in a first encoding process, and encoding another signal representation of one or more channels in a second, filter-based encoding process. A basic idea according to the invention is to select (S2), for the second encoding process, a combination of i) frame division configuration of an overall encoding frame into a set of sub-frames, and ii) filter length for each sub-frame, according to a predetermined criterion. The second signal representation is then encoded (S3) in each sub-frame of the overall encoding frame according to the selected combination. The possibility to select frame division configuration and at the same time adjust the filter length for each sub-frame provides added degrees of freedom, and generally results in improved performance.

Claims

received by the International Bureau on 28 August 2006 (28.08.2006)CLAIMS
1. A method of encoding a multi-channel audio signal comprising the steps of: encoding a first signal representation of at least one of said multiple channels in a first encoding process; encoding a second signal representation of at least one of said multiple channels in a second, filter-based encoding process, characterized by: selecting, for said second encoding process, a combination of i) frame division configuration of an overall encoding frame into a set of variable-length sub- frames, and ii) filter length for each sub-frame, according to a predetermined criterion defined so as to optimize a fidelity measure representative of the performance of said second encoding process over an entire encoding frame; and encoding, for said overall frame, said second signal representation in each of the sub-frames of the selected set of sub-frames in accordance with the selected combination.
2. The encoding method of claim 1, wherein the filter length, for each sub frame, is selected in dependence on the length of the sub-frame.
3. The encoding method of claim 1, wherein said predetermined criterion includes the requirement that the filter length, for each sub frame, is selected in dependence on the length of the sub-frame so that a frame division configuration of an encoding frame into a set of sub-frames provides an indication of selected filter dimension for each sub-frame.
4. The encoding method of claim 3, wherein said predetermined criterion is based on optimization of a measure representative of the performance of said second encoding process over an entire encoding frame where the filter length, for each sub frame, is controlled by the length of the sub-frame.
5. The encoding method of claim 1, wherein said first encoding process is also based on a frame division configuration of an overall encoding frame into a set of sub- frames, and said predetermined criterion includes the requirement that the frame division configuration of an overall encoding frame into a set of sub-frames for said second encoding process is selected to be the same as the frame division configuration of the first encoding process.
6. The encoding method of claim 1, comprising the step of generating output data representative of the selected frame division configuration, and filter length for each sub-frame of the selected frame division configuration.
7. The encoding method of claim 1, wherein said steps of selecting and encoding are performed on a frame-by-frame basis.
8. The encoding method of claim 1, wherein said step of selecting a combination is performed based on inter-channel correlation characteristics of said multi-channel audio signal.
9. The encoding method of claim 1, wherein said second encoding process includes adaptive inter-channel prediction in an inter-channel prediction filter with adjustable filter length for prediction of said second signal representation based on the first signal representation and the second signal representation.
10. The encoding method of claim 9, wherein said step of selecting a combination is performed based on estimated performance of said second encoding process.
11. The encoding method of claim 1, wherein said step of selecting a combination is performed for an auxiliary encoding process, said second encoding process thus being an auxiliary encoding process, whereas said first encoding process being a main encoding process.
12. The encoding method of claim 1, wherein said step of selecting a combination is performed for a main encoding process, said second encoding process thus being a main encoding process, whereas said first encoding process being an auxiliary encoding process.
13. The encoding method of claim 1, wherein said step of selecting a combination is performed for both said first encoding process and said second encoding process.
14. An apparatus for encoding a multi-channel audio signal comprising: - a first encoder for encoding a first signal representation of at least one of said multiple channels; a second, filter-based encoder for encoding a second signal representation of at least one of said multiple channels, characterized by: - means for selecting, for said second encoder, a combination of i) frame division configuration of an overall encoding frame into a set of variable-length sub- frames, and ii) filter length for each sub-frame, according to a predetermined criterion defined so as to optimize a fidelity measure representative of the performance of said second encoding process over an entire encoding frame; and - means for encoding, for said overall frame, said second signal representation in each of the sub-frames of the selected set of sub-frames in accordance with the selected combination.
15. The apparatus of claim 14, wherein said means for selecting a combination is configured to select the filter length, for each sub frame, in dependence on the length of the sub-frame.
16. The apparatus of claim 14, wherein said means for selecting a combination is configured to operate under the requirement that the filter length, for each sub frame, is selected in dependence on the length of the sub-frame so that a frame division configuration of an encoding frame into a set of sub-frames provides an indication of selected filter dimension for each sub-frame.
17. The apparatus of claim 16, wherein said means for selecting a combination is configured to operate based on optimization of a measure representative of the performance of said second encoding process over an entire encoding frame where the filter length, for each sub frame, is controlled by the length of the sub-frame.
18. The apparatus of claim 14, wherein said first encoder also operates based on a frame division configuration of an overall encoding frame into a set of sub-frames, and said means for selecting is configured to operate under the requirement that the frame division configuration of an overall encoding frame into a set of sub-frames for said second encoding process is selected to be the same as the frame division configuration of the first encoding process.
19. The apparatus of claim 14, comprising means for generating output data representative of the selected frame division configuration, and filter length for each sub-frame of the selected frame division configuration.
20. The apparatus of claim 14, wherein said means for selecting and encoding are operable on a frame-by-frame basis.
21. The apparatus of claim 14, wherein means for selecting a combination is responsive to inter-channel correlation characteristics of said multi-channel audio signal.
22. The apparatus of claim 14, wherein said second encoder includes an adaptive inter-channel prediction filter for prediction of said second signal representation based on the first signal representation and the second signal representation, and the selected filter length for each sub-frame relates to the filter length of said inter-channel prediction filter.
23. The apparatus of claim 22, wherein said means for selecting a combination is responsive to estimated performance of said second encoding process.
24. The apparatus of claim 14, wherein said means for selecting a combination is configured to perform selection of a combination of frame division configuration and filter length for each sub-frame for an auxiliary coder, said second encoder thus being an auxiliary encoder, whereas said first encoder being a main encoder.
25. The apparatus of claim 14, wherein said means for selecting a combination is configured to perform selection of a combination of frame division configuration and filter length for each sub-frame for a main encoder, said second encoder thus being a main encoder, whereas said first encoder being an auxiliary encoder.
26. The apparatus of claim 14, wherein said means for selecting a combination is configured to perform selection of a combination of frame division configuration and filter length for each sub-frame for both said first encoder and said second encoder.
27. A method of decoding an encoded multi-channel audio signal comprising the steps of: decoding, in response to first signal reconstruction data, an encoded first signal representation of at least one of said multiple channels in a first decoding process; decoding, in response to second signal reconstruction data, an encoded second signal representation of at least one of said multiple channels in a second decoding process, characterized by: receiving information representative of which frame division configuration of an overall encoding frame into a set of variable length sub-frames, and filter length for each sub-frame, that have been used in a corresponding second encoding process; determining, based on said information, how to interpret said second signal reconstruction data in said second decoding process.
28. The decoding method of claim 27, wherein the filter length, for each sub frame, has been selected in dependence on the length of the sub-frame, and said information includes data that while indicating frame division configuration of an encoding frame into a set of sub-frames at the same time provides an indication of selected filter dimension for each sub-frame.
29. An apparatus for decoding an encoded multi-channel audio signal comprising: means for decoding, in response to first signal reconstruction data, an encoded first signal representation of at least one of said multiple channels in a first decoding process; means for decoding, in response to second signal reconstruction data, an encoded second signal representation of at least one of said multiple channels in a second decoding process, characterized by: means for receiving information representative of which frame division configuration of an overall encoding frame into a set of variable length sub-frames, and filter length for each sub-frame, that have been used in a corresponding second encoding process; means for determining, based on said information, how to interpret said second signal reconstruction data in said second decoding process.
30. The decoding apparatus of claim 29, wherein the filter length, for each sub frame, has been selected in dependence on the length of the sub-frame, and said information includes data that while indicating frame division configuration of an encoding frame into a set of sub-frames at the same time provides an indication of selected filter dimension for each sub-frame.
31. An audio transmission system, characterized in that said system comprises an encoding apparatus of claim 14 and a decoding apparatus of claim 29.
PCT/SE2006/000235 2005-02-23 2006-02-22 Optimized fidelity and reduced signaling in multi-channel audio encoding WO2006091151A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT06716925T ATE518313T1 (en) 2005-02-23 2006-02-22 OPTIMIZED RELIABILITY AND REDUCED SIGNALING IN MULTI-CHANNEL AUDIO CODING
CN2006800056509A CN101128866B (en) 2005-02-23 2006-02-22 Optimized fidelity and reduced signaling in multi-channel audio encoding
EP06716925A EP1856688B1 (en) 2005-02-23 2006-02-22 Optimized fidelity and reduced signaling in multi-channel audio encoding
JP2007556114A JP5171269B2 (en) 2005-02-23 2006-02-22 Optimizing fidelity and reducing signal transmission in multi-channel audio coding

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US65495605P 2005-02-23 2005-02-23
US60/654956 2005-02-23
SEPCT/SE2005/002033 2005-12-22
PCT/SE2005/002033 WO2006091139A1 (en) 2005-02-23 2005-12-22 Adaptive bit allocation for multi-channel audio encoding

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WO2006091151B1 true WO2006091151B1 (en) 2006-12-14

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Also Published As

Publication number Publication date
EP1851759A4 (en) 2010-08-25
WO2006091150B1 (en) 2006-12-14
EP1856688A4 (en) 2010-07-28
US20080262850A1 (en) 2008-10-23
WO2006091151A1 (en) 2006-08-31
US9626973B2 (en) 2017-04-18
EP1856688A1 (en) 2007-11-21
EP1851759A1 (en) 2007-11-07
WO2006091150A1 (en) 2006-08-31
EP1851759B1 (en) 2012-06-20
EP1856688B1 (en) 2011-07-27

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