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).Differential pulse-code modulation (DPCM) has been proposed as a practical encoding scheme for speech, television, and telemetry signals.
|Title||:||Analysis and Subjective Evaluation of Differential Pulse-Code Modulation Voice Communication Systems|
|Author||:||Robert W. Donaldson, National Research Council of Canada. Reprints, Donald Chan, BRITISH COLUMBIA UNIV VANCOUVER DEPT OF ELECTRICAL ENGINEERING.|