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User independent, real-time speech recognition system and method

  • US 5,873,062 A
  • Filed: 01/09/1997
  • Issued: 02/16/1999
  • Est. Priority Date: 11/14/1994
  • Status: Expired due to Fees
First Claim
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1. A computer program product for use in a computerized sound recognition system that is adapted for receiving an audio speech signal and converting the audio speech signal into a representative audio electrical signal that is digitized, the computer program product comprising:

  • a computer readable medium for storing computer readable code means which, when executed by the computerized sound recognition system, will enable the system to identify phoneme sound types that are contained within the audio speech signal; and

    wherein the computer readable code means is comprised of computer readable instructions for causing the computerized sound recognition system to execute a method comprising the steps of;

    receiving an audio speech signal;

    converting the audio speech signal into a representative audio electrical signal;

    digitizing the audio electrical signal at a predetermined sampling rate so as to produce a digitized audio signal;

    performing a time domain analysis on segmentized portions of the digitized audio signal so as to identify at least one time domain sound characteristic of said audio speech signal;

    filtering the segmentized portions of the digitized audio signal using a plurality of filter bands having predetermined high and low cutoff frequencies;

    measuring at least one frequency domain sound characteristic of each of said filtered segmentized portions; and

    based on the at least one time domain characteristic and the at least one frequency domain characteristic, identifying at least one phoneme sound type contained within the audio speech signal.

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