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Method and apparatus for estimating subjective audio signal quality from objective distortion measures

  • US 6,609,092 B1
  • Filed: 12/16/1999
  • Issued: 08/19/2003
  • Est. Priority Date: 12/16/1999
  • Status: Expired due to Fees
First Claim
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1. A method of estimating audio signal quality, the method comprising the steps of:

  • generating a mapping function between a plurality of actual subjective measures determined for a given set of audio signals and corresponding objective distortion measures determined for the given set of audio signals; and

    utilizing the mapping function to generate an estimated subjective measure from an objective distortion measure determined for another audio signal;

    wherein a portion of at least one of the objective distortion measures associated with an mth frame of a given source speech sequence is given by D

    (m)
    =

    i=1Nb






    C

    (m,i)




    X

    (m,i)
    -Y

    (m,i)


    embedded imagewhere X(m, i) and Y(m, i) are auditory representations of source and processed speech, respectively, for the sequence, 1≦

    i≦

    Nb denotes a frequency bin index, Nb is the dimension of a frame vector, and C(m, i) is an asymmetric weighting factor;

    wherein an overall auditory-based objective distortion measure between the source and processed speech sequences X and Y is determined by

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