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Speech segment coding and pitch control methods for speech synthesis systems

  • US 5,617,507 A
  • Filed: 07/14/1994
  • Issued: 04/01/1997
  • Est. Priority Date: 11/06/1991
  • Status: Expired due to Fees
First Claim
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1. A speech coding method for use in speech synthesis, comprising:

  • obtaining a set of spectral envelope parameters that represents an estimated spectral envelope of a voiced speech signal by using a spectrum estimation technique;

    deconvolving said voiced speech signal, with an impulse response that is a time-domain representation of said estimated spectral envelope of said voiced speech signal, into a pitch pulse train signal having a sequence of periodically located pitch pulses;

    forming an excitation signal by appending zero-valued samples to each pitch pulse signal of one period such that one pitch pulse is contained in each period;

    convolving said excitation signal with said impulse response into wavelets;

    obtaining wavelet codes by coding the wavelets of all periods; and

    storing in memory wavelet codes and information of corresponding pitch pulse locations of all wavelets, for use in speech synthesis.

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