CA2331611A1 - Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation - Google Patents

Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation Download PDF

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Publication number
CA2331611A1
CA2331611A1 CA002331611A CA2331611A CA2331611A1 CA 2331611 A1 CA2331611 A1 CA 2331611A1 CA 002331611 A CA002331611 A CA 002331611A CA 2331611 A CA2331611 A CA 2331611A CA 2331611 A1 CA2331611 A1 CA 2331611A1
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Prior art keywords
audio
audio coder
bit allocation
coder
predictive
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Granted
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CA002331611A
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French (fr)
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CA2331611C (en
Inventor
Stephen M. Smyth
Michael H. Smyth
William P. Smith
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DTS Inc
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Individual
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    • 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
    • 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
    • G10L19/02—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 spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/0204—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 spectral analysis, e.g. transform vocoders or subband vocoders using subband decomposition
    • G10L19/0208—Subband vocoders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/008—Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels

Abstract

A subband audio coder (12) employs perfect/non-perfect reconstruction filters (34), predictive/non-predictive subband encoding (72), transient analysis (106), and psycho-acoustic/minimum mean-square-error (mmse) bit allocation (30) over time, frequency and the multiple audio channels to encode/decode a data stream to generate high fidelity reconstructed audio. The audio coder windows (64) the multi-channel audio signal such that the frame size, i.e., number of bytes, is constrained to lie in a desired range, and formats the encoded data so that the individual subframes can be played back as they are received thereby reducing latency. Furthermore, the audio coder processes the baseband portion (0-24kHz) of the audio bandwidth for sampling frequencies of 48kHz and higher with the same encoding/decoding algorithm so that audio coder architecture is future compatible.
CA002331611A 1995-12-01 1996-11-21 Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation Expired - Lifetime CA2331611C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US789695P 1995-12-01 1995-12-01
US60/007,896 1995-12-01
US08/642,254 US5956674A (en) 1995-12-01 1996-05-02 Multi-channel predictive subband audio coder using psychoacoustic adaptive bit allocation in frequency, time and over the multiple channels
US08/642,254 1996-05-02
CA002238026A CA2238026C (en) 1995-12-01 1996-11-21 Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002238026A Division CA2238026C (en) 1995-12-01 1996-11-21 Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation

Publications (2)

Publication Number Publication Date
CA2331611A1 true CA2331611A1 (en) 1997-06-12
CA2331611C CA2331611C (en) 2001-09-11

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CA002238026A Expired - Lifetime CA2238026C (en) 1995-12-01 1996-11-21 Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation
CA002331611A Expired - Lifetime CA2331611C (en) 1995-12-01 1996-11-21 Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation

Family Applications Before (1)

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CA002238026A Expired - Lifetime CA2238026C (en) 1995-12-01 1996-11-21 Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation

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US (4) US5956674A (en)
EP (1) EP0864146B1 (en)
JP (1) JP4174072B2 (en)
KR (1) KR100277819B1 (en)
CN (5) CN101872618B (en)
AT (1) ATE279770T1 (en)
AU (1) AU705194B2 (en)
BR (1) BR9611852A (en)
CA (2) CA2238026C (en)
DE (1) DE69633633T2 (en)
DK (1) DK0864146T3 (en)
EA (1) EA001087B1 (en)
ES (1) ES2232842T3 (en)
HK (4) HK1015510A1 (en)
MX (1) MX9804320A (en)
PL (3) PL182240B1 (en)
PT (1) PT864146E (en)
WO (1) WO1997021211A1 (en)

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