Arrangement for past DPCM coding of video signals according to a

Details Arrangement for past DPCM coding of video signals according to a Arrangement for past DPCM coding of video signals according to a

1988-03-24

1989-09-05

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, H04N 712

Patent

active

048643971

ABSTRACT:
In a DPCM coder respective estimated values are subtracted from digitized picture element signals and estimated errors are used for signal transmission after quantization and coding. Each estimated value is derived from a reconstructed picture element signal formed in an adder. Separate, simultaneous subtractions of the signal taken at the output of the adder, as well as of the positive and negative adder limit values, from the respective picture element signal at the input thereby occur, whereby an overflow recognition device and a multiplexer provide that only the difference from the three differences formed up to this point are taken into consideration for quantization on the basis of the actual addition result, including no overflow, positive overflow and negative overflow.

REFERENCES:
patent: 4281344 (1981-07-01), Mounts et al.
patent: 4636856 (1987-01-01), Starck
patent: 4706260 (1987-11-01), Fedele et al.

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