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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CA
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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Publication of CA2090159A1 publication Critical patent/CA2090159A1/en
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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
US844,804 1992-03-02
US07/844,804 US5285498A (en) 1992-03-02 1992-03-02 Method and apparatus for coding audio signals based on perceptual model

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)

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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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