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Decomposition in noise and periodic signal waveforms in waveform interpolation

  • US 5,517,595 A
  • Filed: 02/08/1994
  • Issued: 05/14/1996
  • Est. Priority Date: 02/08/1994
  • Status: Expired due to Term
First Claim
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1. A method of coding a speech signal, the method comprising the steps of:

  • 1. generating a time-ordered sequence of sets of parameters based on samples of the speech signal, each set of parameters corresponding to a waveform characterizing the speech signal;

    2. grouping parameters of the plurality of sets based on index values for said parameters to form a first set of signals which set represents an evolution of characterizing waveform shape across the time-ordered sequence of sets;

    3. filtering signals of the first set to remove low-frequency components of said signals evolving over time at low frequencies, wherein said filtering produces a second set of signals which second set represents relatively high rates of evolution of characterizing waveform shape; and

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