CA2090159A1 - Method and apparatus for coding audio signals based on perceptual model - Google Patents

Method and apparatus for coding audio signals based on perceptual model

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Publication number
CA2090159A1
CA2090159A1 CA2090159A CA2090159A CA2090159A1 CA 2090159 A1 CA2090159 A1 CA 2090159A1 CA 2090159 A CA2090159 A CA 2090159A CA 2090159 A CA2090159 A CA 2090159A CA 2090159 A1 CA2090159 A1 CA 2090159A1
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Canada
Prior art keywords
audio signals
perceptual
accomplished
switching
high quality
Prior art date
Legal status (The legal status 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 status listed.)
Granted
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CA2090159A
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French (fr)
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CA2090159C (en
Inventor
James Davis Johnston
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AT&T Corp
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American Telephone and Telegraph Co Inc
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Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2090159A1 publication Critical patent/CA2090159A1/en
Application granted granted Critical
Publication of CA2090159C publication Critical patent/CA2090159C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/02—Analogue recording or reproducing
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H04B1/665—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using psychoacoustic properties of the ear, e.g. masking effect

Abstract

Coding of high quality stereophonic audio signals is accomplished in a perceptual filterbank coder which exploits the interchannel redundancies and psychoacoustic. Using perceptual principles, switching between a normal and short window of input samples improve output signal quality for certain input signals,particularly those having a rapid attack. Switching is also accomplished betweencoding of left and right channels and so- called sum and difference channels in response to particular signal conditions. A number of new perceptually based techniques, including improved threshold determinations, result in high quality.
CA002090159A 1992-03-02 1993-02-23 Method and apparatus for coding audio signals based on perceptual model Expired - Lifetime CA2090159C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/844,804 US5285498A (en) 1992-03-02 1992-03-02 Method and apparatus for coding audio signals based on perceptual model
US844,804 1992-03-02

Publications (2)

Publication Number Publication Date
CA2090159A1 true CA2090159A1 (en) 1993-09-03
CA2090159C CA2090159C (en) 1999-05-18

Family

ID=25293673

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002090159A Expired - Lifetime CA2090159C (en) 1992-03-02 1993-02-23 Method and apparatus for coding audio signals based on perceptual model

Country Status (6)

Country Link
US (2) US5285498A (en)
EP (1) EP0559383B1 (en)
JP (1) JP3258424B2 (en)
KR (1) KR970007661B1 (en)
CA (1) CA2090159C (en)
DE (1) DE69326492T2 (en)

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