Abstract
Speech compression systems are described which make use of orthonormal function expansions of either the speech waveform itself or the short-time autocorrelation function of the speech waveform. A system of this type theoretically can be optimized so that a minimum number of independent, slowly varying parameters are transmitted for a given level of desired performance. In both types of systems, the compression in data rate is obtained through the optimization of the expansion series, the truncation of the series, and by averaging the coefficients of the expansion over several pitch periods. In addition, the phase spectrum of the speech signal can be eliminated in a systematic manner in both the system wherein the waveform is analyzed and the systems where the autocorrelation function is analyzed.
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