Video-signal DPCM coder with adaptive prediction

Details Video-signal DPCM coder with adaptive prediction Video-signal DPCM coder with adaptive prediction

1988-05-02

1989-05-02

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, 375 27, H04N 7137

Patent

active

048273406

ABSTRACT:
For a video-signal-coding facility using adaptive DPCM in which switching is effected block by block between different predictors, a basic circuit arrangement is given for the case where switching is to be effected between a two-dimensional intraframe predictor and a pure interframe predictor (FIG. 1). Uniform processor elements (PE.sub.1, PE.sub.0) cooperate with predictor loops (Pr.sub.1, Pr.sub.2, 10, 11) and circuits are provided which ensure that the appropriate reconstructed sample values (X.sub.0 ', X.sub.1 ') are used whenever switching between coders occurs. In a preferred embodiment (FIG. 3), the decision on the best suited coder is delayed by one block, whereby the maximum processing speed is substantially increased. Circuits (PE.sub.2, 12, 13, S.sub.3 ', S.sub.4 ', S.sub.4 ') are provided which ensure that even in case of such a delayed decision, the correct reconstructed sample values (x.sub.0 ', x.sub.1 ', x.sub.2 ') are used.

REFERENCES:
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patent: 4591909 (1986-05-01), Hirano
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patent: 4679086 (1987-07-01), May
patent: 4733298 (1988-03-01), Koga
patent: 4743967, Takenaka
P. Pirsch, "Design of a DPCM Codec for VLSI Realization in CMOS Technology" Proc. IEEE vol. 73, No. 4, pp. 592-598 (Apr. 1985).
H. Buley et al, "Inter/Intraframe Coding of Color TV Signals for Transmission at the Third Level of the Digital Hierarchy" Proc. IEEE vol. 73, No. 4, pp. 765-77.

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