Applications of Analog Sampled Data Signal Processing to Low-Cost Speech Bandwidth Compression
Semi-annual rept. for period ending 1 Mar 1978
CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB
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The basic objective of this contract is to apply MOS-LSI techniques to the problem of narrow band vocoding. In particular, analog sampled data techniques are being used to implement the high speed processing required in an autocorrelation type linear predictive coder LPC and decoder. The remaining processing will then be performed in a relatively low speed and therefore low cost microprocessors. Also important in a complete narrow band vocoder is a pitch tracker. The method being investigated for this function is a modified version of the Gold-Rabiner time domain algorithm implemented using a hybrid analog-digital approach. This report will be a brief summary of the present state of the work on the above three components of a complete LPC vocoder.