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Process for measuring the resemblance between sound samples and apparatus for performing this process

  • US 5,469,529 A
  • Filed: 09/21/1993
  • Issued: 11/21/1995
  • Est. Priority Date: 09/24/1992
  • Status: Expired due to Term
First Claim
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1. A process for measuring a resemblance between a plurality of sound samples, comprising:

  • a learning phase comprising the steps of;

    acoustically analyzing a reference sound sample using a pth order acoustical analysis to obtain a resultant vector signal of the reference sound sample;

    calculating a covariance matrix X of size p×

    p using the resultant vector signal of the reference sound sample;

    inverting said covariance matrix X to obtain an inverted covariance matrix X-1 ; and

    storing the inverted covariance matrix X31 1 in a dictionary;

    a test phase comprising the steps of;

    acoustically analyzing a test sound sample using a pth order acoustical analysis to obtain a resultant vector signal of the test sound sample;

    calculating a covariance matrix Y of size p×

    p using the resultant vector signal of the test sound sample;

    multiplying the covariance matrix Y with the inverted covariance matrix X-1 to obtain a product YX-1 ;

    calculating p eigenvalues λ

    k of YX-1 ;

    determining a resemblance between the reference sound sample and the test sound sample using generalized sphericity functions using at least two of the following equations;

    ##EQU12## where a, g, and h represent respectively an arithmetic, geometric, and harmonic mean values of the eigenvalues λ

    k,wherein the learning phase and test phase each further perform the steps of;

    amplifying the sound samples;

    filtering the amplified sound samples; and

    digitizing the filtered amplified sound samples.

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