Predictive codec capable of selecting one of at least three pred

Details Predictive codec capable of selecting one of at least three pred Predictive codec capable of selecting one of at least three pred

1977-12-16

1979-03-13

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325 38B, 358138, 364515, H04N 712

Patent

active

041445430

ABSTRACT:
A predictive encoder produces a prediction error signal in response to an autocorrelated signal, such as a television broadcast signal. The encoder includes a prediction signal producing circuit for producing several prediction signals for each sample element of the autocorrelation signal. The several prediction signals comprise preferably a single intraframe prediction signal and a group of interframe or interfield prediction signals. The group of prediction signals are compared with the sample element of the autocorrelation signal to produce a selection signal indicative of which one of the group gives the best approximation of the autocorrelated signal. The prediction signal of the group giving the best approximation along with the intraframe prediction signal are selected out of the total number of prediction signals. A further selection is made between the two first selected prediction signals according to a prediction error signal. The last selected prediction signal is compared with the autocorrelation signal to form a prediction error signal which is transmitted along with the selection signal. A predictive decoder for use in combination with the encoder reproduces the prediction error signal, and the selection signal produces the prediction signals corresponding to those used in the encoder, selects at least two thereof according to the reproduced selection signal, and again selects one of the last-mentioned at least two prediction signals according to the reproduced prediction error signal.

REFERENCES:
patent: 2946851 (1960-07-01), Kretzmer
patent: 3568063 (1971-03-01), Brown
patent: 4075655 (1978-02-01), Iijima
patent: 4077053 (1978-02-01), Ishiguro

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