Accession Number : AD0703114

Title :   ANALYSIS AND SUBJECTIVE EVALUATION OF DIFFERENTIAL PULSE-CODE MODULATION VOICE COMMUNICATION SYSTEMS,

Corporate Author : BRITISH COLUMBIA UNIV VANCOUVER DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Donaldson,Robert W. ; Chan,Donald

Report Date : 14 JUN 1968

Pagination or Media Count : 10

Abstract : Differential pulse-code modulation (DPCM) has been proposed as a practical encoding scheme for speech, television, and telemetry signals. In this paper, the mean-square error for DPCM systems is derived, and its minimization by proper choice of system variables is examined. A simple analytical method is then presented for optimizing the system bandwidth W, the number of quantization bits L, and the parameters of the DPCM feedback network when the input is a speech signal and channel noise is negligible. A method is then developed for measuring the subjective quality of voice communication systems as a function of an arbitrary number of system parameters. The method was used to measure the quality of PCM speech and DPCM speech as a function of W and L. (Author)

Descriptors :   (*VOICE COMMUNICATIONS, *PULSE CODE MODULATION), SPEECH, ERRORS, BANDWIDTH, OPTIMIZATION, CANADA

Subject Categories : Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE