System for encoding and decoding video signals

Details System for encoding and decoding video signals System for encoding and decoding video signals

1982-10-21

1985-08-06

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 12, H04N 5782, H04N 932

Patent

active

045339600

ABSTRACT:
A system is described which makes use of the fact that in a raster scanned television system a high degree of correlation exists both in the luminance and in the chrominance signals of a pair of adjacent lines. Because of this correlation, the difference between the luminance signals of the two lines is usually much smaller than luminance signal of either line alone, and requires less bandwidth. The present invention takes advantage of the natural correlation in a television picture in the horizontal and vertical directions for bandwidth reduction without significant impairment of the reproduced picture. This is accomplished by processing the television signal for bandwidth reduction in particular ways and transmitting it entirely in the analog domain. The bandwidth requirement is reduced for the transmission of the video signals over a transmission channel such as a cable television channel, a broadcast channel or a storage medium.

REFERENCES:
patent: 3700793 (1972-10-01), Borsut et al.
patent: 4027333 (1977-05-01), Kaiser et al.
patent: 4034404 (1977-07-01), Nakagome et al.
patent: 4287528 (1981-09-01), Levy
patent: 4467356 (1984-08-01), McCoy
Robert B. Dome, Spectrum Utilization in Color Television, Proc. IEEE, Oct. 1951, p. 1326.

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