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Vocal pitch corrector

  • US 5,966,687 A
  • Filed: 07/11/1997
  • Issued: 10/12/1999
  • Est. Priority Date: 12/30/1996
  • Status: Expired due to Term
First Claim
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1. A method for correcting a pitch of a to-be-corrected human generated vocal signal comprising the steps of:

  • (a) receiving a to-be-corrected human vocal signal;

    (b) determining an unknown pitch of the received to-be-corrected human vocal signal and generating a dynamically varying pitch signal which indicates the dynamically varying determined pitch of the to-be-corrected human vocal signal;

    (c) receiving a dynamically varying reference pitch signal which depends on the dynamically varying pitch of a reference signal with correct pitch;

    (d) generating an error signal between the pitch signal and the reference pitch signal; and

    (e) correcting a pitch of the received to-be-corrected human vocal signal by shifting only the pitch of the to-be-corrected human vocal signal based on the error signal to match a pitch of the reference signal while preserving a formant of the to-be-corrected human vocal signal.

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