Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-10-25
1979-01-02
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, 358 13, 340347DD, 325 38B, H04N 712
Patent
active
041330064
ABSTRACT:
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.
REFERENCES:
patent: 3679821 (1972-07-01), Schroeder
patent: 3890462 (1975-06-01), Limb et al.
patent: 4075655 (1978-02-01), Iijima et al.
Coles Edward L.
Nippon Electric Co. Ltd.
Richardson Robert L.
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