Patent ID: 6078879
Filing Date: 2000-06-20
Classification: G10L

Abstract:
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; andpitch 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.