DPCM predictive encoder

Details DPCM predictive encoder DPCM predictive encoder

1992-09-18

1994-06-21

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

375 27, 375 33, H04N 7137

Patent

active

053231880

ABSTRACT:
In a DPCM predictive encoder (or performing DPCM prediction by digitizing a NTSC color television signal with a rate three times of a color sub-carrier frequency, a two-frame predictor which outputs a differential signal over two frames is employed as one of predictors. A predictor switcher adaptively selects one of prediction information as an optimal prediction signal and selects corresponding differential information as an optimal differential signal. This differential signal is quantized by a quantizer. The quantized output and the optimal prediction signal are summed by an adder and supplied to the predictors as a local decoding signal.

REFERENCES:
patent: 4794447 (1988-12-01), Tsinberg
patent: 4833535 (1989-05-01), Ozeki
patent: 5159448 (1992-10-01), Kojima

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