Method and apparatus for DPCM video signal compression and trans

Details Method and apparatus for DPCM video signal compression and trans Method and apparatus for DPCM video signal compression and trans

1988-03-11

1990-08-14

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, H04N 712

Patent

active

049491768

ABSTRACT:
A differential pulse code modulation apparatus comprises an error signal generator for receiving an input video signal comprising successive words representing video samples, and being operative to produce therefrom an error signal of which successive words each represent a difference between a word of the input signal and a predicted value therefor, a compander for compressing and expanding the error signal to produce a received video signal, an adder for adding successive words of the received video signal to successive words of a predicted value signal representing the predicted values to produce a received error signal, and a predictor responsive to the received error signal to produce the predicted value signal, the transfer function of the compander having been established in dependence on the minimum numbers of quantizing levels required to quantize a picture element of a video signal without the quantization levels being visually apparent for each of a range of input frequencies of the video signal.

REFERENCES:
patent: 4292651 (1981-09-01), Kretz et al.
patent: 4519085 (1985-05-01), Catros
patent: 4725885 (1988-02-01), Gonzales et al.
patent: 4742391 (1988-05-01), Sorgi et al.
patent: 4788692 (1988-11-01), Takebagashi et al.
patent: 4791483 (1988-12-01), Miller
patent: 4831636 (1989-05-01), Taniguchi et al.

Affiliated with

Also associated with

Rating

Method and apparatus for DPCM video signal compression and trans does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for DPCM video signal compression and trans, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for DPCM video signal compression and trans will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-466754