Method and apparatus for digitally encoding color video signals

Details Method and apparatus for digitally encoding color video signals Method and apparatus for digitally encoding color video signals

1977-06-21

1979-08-14

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 932, H04N 939

Patent

active

041647491

ABSTRACT:
An analog PAL color television signal which is to be encoded is passed through a comb filter to separate the signal into a chrominance component and a luminance component each having a carrier frequency. Each signal is then separately scanned at a rate which is directly related to the color carrier frequency (4.43 MHz) of the signal. The luminance signal is fed to a scanning and holding circuit which scans it at a rate of twice the color carrier frequency or 8.86 MHz. The chrominance signal is fed to a scanning and holding circuit which scans it at a rate which is one-half the color carrier frequency of 2.21 MHz. This scanning and holding of each component signal converts the signals into a corresponding PAM signal. Each PAM signal is then quantized and encoded in a PCM coder. The resulting signals are applied to a digital combiner which thereby produces a digital color video signal.

REFERENCES:
patent: 3795763 (1974-03-01), Golding et al.
patent: 4051516 (1977-09-01), Weston
Busby-Principles of Digital Television Simplified-SMPTE-vol. 84 pp. 542-545, Jul. 1975.
Sabatier-Differential Coding of Colour TV Signal Components ACTA Electronica-vol. 19-#3-pp. 245-253, 1976.
BBC Engineering-#102, p. 36, Mar. 1976.
Goldberg-PCM NTSC Television Characteristics Jour. SMPTE vol. 85 #3 Mar. 1976, pp. 141-145.

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