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Frequency selective harmonic coding

  • US 5,574,823 A
  • Filed: 06/23/1993
  • Issued: 11/12/1996
  • Est. Priority Date: 06/23/1993
  • Status: Expired due to Fees
First Claim
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1. A method of encoding a speech signal comprising:

  • (a) processing said speech signal by harmonic coding to generate a fundamental frequency signal, and a set of optimal harmonics,(b) processing said fundamental frequency signal, and harmonics to select a number of bands encompassing a reduced number of harmonics, and to generate for each of the selected bands a voiced or unvoiced decision signal, an optimal subset of magnitudes and a signal indicating the positions of the selected bands, and transmitting a pitch signal and signals indicating the position of the selected bands with a bandwidth that contains reduced harmonics and thus is a fraction of the bandwidth of said speech signal.

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