PROCESS AND SYSTEM FOR THE DIFFERENTIAL CODING AND DECODING OF DATA, WITH LIMITATION OF THE PROPAGATION OF TRANSMISSION ERRORS

摘要

A differential coding-decoding system, in which the coder comprises a forecaster delivering, on the basis of a reconstructed value corresponding to a coded quantity, a forecaster P for the following quantity X to be coded, a forecast error quantizer delivering the difference d=X-P, and a forecast quantizer, the outputs of which are connected to a code allocator, the allocated code word transmitted for a quantity X to be coded being related, first to the forecast error quantization level Ei formulated by the forecast error quantizer, and, second, to the quantized forecast Pj formulated by the forecast quantizer; the codes allocated to successive forecast error zones corresponding to forecasts Pj are always assigned in the same order, when j varies from minimum to maximum forecast error zones.