Digit rate reducing method in video signal transmission

Details Digit rate reducing method in video signal transmission Digit rate reducing method in video signal transmission

1976-06-23

1977-11-29

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 712

Patent

active

040608328

ABSTRACT:
A digit rate reducing method in the transmission of video-telephone signals, wherein each frame is scanned by means of two consecutive fields comprising each the lines of same parity, each frame dot being represented by a word of n, in particular 3, binary digits comprising transmitting a frame every three frames, storing a frame of each parity at the receiving equipment in a frame storage device, systematically freshening-up a stored frame by the next transmitted frame of same parity, and regenerating intermediate frames by interpolating between the stored frames, further comprising forming a pseudo-field I.sub.n with opposite parity to a stored field T.sub.n by interpolating between T.sub.n and the stored field T.sub.n+3 or T.sub.n-3, and regenerating an intermediate field T.sub.n+1 or T.sub.n-1 from I.sub.n and T.sub.n+3 or T.sub.n-3, respectively.

REFERENCES:
patent: 3051778 (1962-08-01), Graham
patent: 3366739 (1968-01-01), Parkinson
patent: 3715483 (1973-02-01), Limb et al.

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