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System and method for sound recognition with feature selection synchronized to voice pitch

  • US 4,783,807 A
  • Filed: 08/27/1984
  • Issued: 11/08/1988
  • Est. Priority Date: 08/27/1984
  • Status: Expired due to Fees
First Claim
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1. A method of transforming a sound signal having positive pressure wave portions and negative pressure wave portions into character signals, said method comprising the steps of:

  • (a) producing an analog signal representing said sound signal;

    (b) producing a binary signal having a "1" level during positive pressure wave portions of said sound signal and a "0" level during negative pressure wave portions of said sound signal;

    (c) detecting the peak amplitude of each pitch cycle of said analog signal and producing a pitch cycle marker signal synchronized to a maximum peak amplitude portion of said analog signal;

    (d) producing a first number that represents the duration of a "1" level of said binary signal most closely following a pulse of said pitch cycle marker signal and producing a second number that represents the duration of the next most closely following "1" level of said binary signal;

    (e) producing a character vector having a magnitude and a direction from said first and second numbers and comparing said character vector with a plurality of stored vectors to determine if said character vector matches any of said stored vectors; and

    (f) producing a character signal representing a sound corresponding to a one of said stored vectors that matches said character vector.

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