Accession Number : AD0703113

Title :   ANALYSIS, SUBJECTIVE EVALUATION, OPTIMIZATION, AND COMPARISON OF THE PERFORMANCE CAPABILITIES OF PCM, DPCM, DELTA M, AM, AND PM VOICE COMMUNICATION SYSTEMS,

Corporate Author : BRITISH COLUMBIA UNIV VANCOUVER DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Donaldson,Robert W. ; Douville,Rene J.

Report Date : 02 DEC 1968

Pagination or Media Count : 10

Abstract : The research was conducted in order to provide a partial answer to the question: 'Which of a set voice communication systems provides satisfactory performance for the least cost'. Since the ultimate measure of performance is the subjective quality of the received message, a subjective evaluation procedure was developed and used to subjectively evaluate, optimize, and compare the performance capabilities of pulse-code modulation (PCM), differential PCM (DPCM), deltamodulation (delta M), double- and single-sideband amplitude modulation (AM), and phase modulation (PM) systems. The results can also be used to evaluate pulse amplitude modulation systems. For each type of system a unique set of optimum parameters was obtained, and the maximum subjective quality was determined as a function of the characteristics of the transmission channel. For good channels, DPCM is superior to PCM, which in turn is superior to AM and PM. For lower quality channels, AM systems are sometimes best. Only for bit rates of less than 10 and 18 kbit/s, respectively, is delta M competitive with DPCM and PCM. (Author)

Descriptors :   (*VOICE COMMUNICATIONS, *MODULATION), OPTIMIZATION, DIGITAL SYSTEMS, ERRORS, SPEECH, TEST METHODS, PULSE CODE MODULATION, AMPLITUDE MODULATION, PHASE MODULATION, DELTA MODULATION, CANADA

Subject Categories : Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE