Electrical Engineering, Department of


Date of this Version



Published in IEEE Conference on Decision and Control including the 14th Symposium on Adaptive Processes, 1975; Vol. 14, Part 1 (Dec. 1975), p. 353; doi 10.1109/CDC.1975.270705 Copyright © 1975 IEEE. Used by permission.


Both differential pulse code modulation (DPCM) and adaptive predictive coding (APC) systems have been used somewhat successfully for low date rate digital voice transmission. A DPCM system has as its goal the removal of signal redundancy prior to transmission by a linear prediction of the incoming signal with a weighted combination of past signal estimates. The error in the prediction process is then quantized and transmitted to the receiver. An identical prediction loop is used at the receiver to reinsert the redundancy, and hence, to reconstruct the speech signal. Both the quantizer and predictor may or may not be adaptive.