Predictive encoder or decoder with selection of one of two...

Details Predictive encoder or decoder with selection of one of two... Predictive encoder or decoder with selection of one of two...

H - Electricity

04

N

350/33, 354/68

H04N 7/12 (2006.01) G06T 9/00 (2006.01) H03M 3/04 (2006.01) H04N 7/36 (2006.01)

Patent

CA 1099018

Abstract of the Disclosure A system carries out predictive encoding or decoding by selecting a prediction signal for a longer period among two or more prediction signals at the beginning of an autocorrelated signal to be encoded or of a prediction error signal to be decoded. At least one of the prediction signals may be a composite prediction signal. A sampling interval after each instant at which the prediction error signal exceeds in absolute value a threshold level, the encoding or decoding is carried out with the prediction signals switched from one to another. A control circuit for two prediction signals comprises a two- input Exclusive OR gate supplied with a result of comparison of the prediction error signal with the threshold level and a sample delay supplied with the Exclusive OR output. The delayed signal is supplied back to the Exclusive OR gate and forward to a switch for switching the prediction signals.

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