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Speaker verification utilizing compressed audio formants

  • US 6,898,568 B2
  • Filed: 07/13/2001
  • Issued: 05/24/2005
  • Est. Priority Date: 07/13/2001
  • Status: Active Grant
First Claim
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1. A method of performing speaker verification to determine whether a speaker is a registered speaker, the method comprising:

  • a) obtaining an array of frames of compressed audio formants representing the speaker uttering a predetermined pass phrase, each frame within the array including;

    i) energy data and pitch data characterizing the residue of the speaker uttering the predetermined pass phrase; and

    ii) a plurality of formant coefficients characterizing the resonance of the speaker uttering the predetermined pass phrase; and

    b) performing a time domain normalization of the array of frames of compressed audio formants to a sample array of frames of compressed audio formants such that such that the two arrays are of an equal quantity of frames;

    c) determining whether the speaker is the registered speaker by;

    generating an array of discrepancy values, each discrepancy value representing the difference between one of;

    i) an energy value;

    ii) a pitch value; and

    iii) a formant coefficient value of a frame of the array and a corresponding energy value;

    ii) pitch value; and

    iii) formant coefficient value of a corresponding frame in the sample array; and

    determining whether the array of discrepancy values is within a predetermined threshold.

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