Predictor controlled encoder for digital transmission systems

Details Predictor controlled encoder for digital transmission systems Predictor controlled encoder for digital transmission systems

1988-12-05

1990-07-17

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, H04N 7137

Patent

active

049424670

ABSTRACT:
A pre-encoder look-up table (LUT) provides output symbols for a statistical coder in response to signals representing a prediction of a prediction signal in a differential pulse code modulation (DPCM) system. The normal prediction signal is used as one address to the LUT and the prediction of that normal signal is used as a second address. The average probability distribution of the signals is determined to construct the LUTs wherein the output symbols are assigned values corresponding to different average probabilities of occurrence of the signal to be processed to thereby reduce the entropy further without adding overhead control symbols to the transmission system.

REFERENCES:
patent: 4141034 (1979-02-01), Netravali et al.
patent: 4144543 (1979-03-01), Koga
patent: 4742391 (1988-05-01), Sorgi et al.

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