The Effects of Digital Errors on PCM Transmission of Compandored Speech

A comparison of the effects of digital errors for a logarithmically compandored1,2 system transmitting speech by PCM is made on the basis of mean square error power and the distribution of the error magnitude. A block diagram of the system considered in the analysis is shown in Fig. 1. The calculations are based on the assumption of at most one error per 8-digit word. The results obtained for binary and Gray codes indicate that there is a "click" as well as "noise" component of distortion at low talker levels. "Clicks" have been defined as errors which have amplitudes greater than half the full range, the remaining error 2227 2238 THE HELL SYSTEM TECHNICAL JOURNAL, DECEMBER 19(i5 DIGITAL ERROR Fig. 1 -- A block diagram of the system under consideration.