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Frequency domain parameter sequence generating method, encoding method, decoding method, frequency domain parameter sequence generating apparatus, encoding apparatus, decoding apparatus, program, and recording medium

  • US 10,504,533 B2
  • Filed: 04/30/2019
  • Issued: 12/10/2019
  • Est. Priority Date: 04/24/2014
  • Status: Active Grant
First Claim
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1. A frequency domain parameter sequence generating method, implemented by a frequency domain parameter sequence generating apparatus having processing circuitry, comprising:

  • where p is an integer equal to or greater than 1, a linear prediction coefficient sequence which is obtained by linear prediction analysis of audio signals in a predetermined time segment is represented as a[1], a[2], . . . , a[p], and ω

    [1], ω

    [2], . . . , ω

    [p] are a frequency domain parameter sequence derived from the linear prediction coefficient sequence a[1], a[2], . . . , a[p],determining, by the processing circuitry, a converted frequency domain parameter sequence {tilde over ( 

    )}ω

    [1], {tilde over ( 

    )}ω

    [2], . . . , {tilde over ( 

    )}ω

    [p] using the frequency domain parameter sequence ω

    [1], ω

    [2], . . . , ω

    [p] as input in a parameter sequence conversion step, whereinthe processing circuitry determines a value of each converted frequency domain parameter {tilde over ( 

    )}ω

    [i] (i=1, 2, . . . , p) in the converted frequency domain parameter sequence {tilde over ( 

    )}ω

    [1], {tilde over ( 

    )}ω

    [2], . . . , {tilde over ( 

    )}ω

    [p] through linear transformation which is based on a relationship of values between ω

    [i] and one or more frequency domain parameters adjacent to ω

    [i].

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