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Transmitter with an improved harmonic speech encoder

  • US 6,078,879 A
  • Filed: 07/13/1998
  • Issued: 06/20/2000
  • Est. Priority Date: 07/11/1997
  • Status: Expired due to Fees
First Claim
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1. A transmitter for transmission of a speech signal, said transmitter including a speech encoder having analysis means for deriving a plurality of linear prediction coefficients from said speech signal;

  • said analysis means comprising;

    pitch determining means for determining a fundamental frequency of the speech signal;

    means for determining the amplitude and frequency of each of a plurality of harmonically related sinusoidal components of said speech signal, said determination being based on said linear prediction coefficients and said fundamental frequency; and

    pitch tuning means for tuning a fundamental frequency (pitch) of said plurality of harmonically related signal components so as to minimize the difference between a representation of said speech signal and a representation of said plurality of harmonically related signal components;

    said transmitter further comprising means for transmitting a representation of the amplitudes of said plurality of harmonically related signal components and of the fundamental frequency of said speech signal;

    and wherein;

    (i) determination of the amplitude and frequency of each of said plurality of harmonically related signal components is based on said linear prediction coefficients in substantially unquantized form; and

    (ii) the representation of the amplitudes of said plurality of harmonically related signal components comprises said linear prediction coefficients in quantized form and a gain factor based on said quantized linear prediction coefficients and said fundamental frequency of said speech signal.

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