Differential data coding and decoding process and system restric

Details Differential data coding and decoding process and system restric Differential data coding and decoding process and system restric

1982-09-27

1985-05-21

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

332 11D, 358135, H03K 1322

Patent

active

045190852

ABSTRACT:
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 E.sub.i formulated by the forecast error quantizer, and, second, to the quantized forecast P.sub.j formulated by the forecast quantizer; the codes allocated to successive forecast error zones corresponding to forecasts P.sub.j are always assigned in the same order, when j varies from minimum to maximum forecast error zones.

REFERENCES:
patent: 4099122 (1978-07-01), Van Buul
patent: 4179710 (1979-12-01), Ishiguro et al.
patent: 4229820 (1980-10-01), Enomoto
patent: 4292651 (1981-09-01), Kretz et al.
patent: 4411001 (1983-10-01), Van Buul et al.
Van Buul "Hybrid D-PCM A Combination of PCM and DPCM IEEE on Communications vol. Com-20, Mar. 1978, pp. 362-368.
Maxemchuk "Performance of DPCM Coders for Picture Signals in Presence of Transmission Errors" Conference Board 1978, International Conf. on Communications vol. 1 4-7 pp. 12B.3.1-12B.3.6.

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