Method and apparatus for PCM-encoding NTSC color television at s

Details Method and apparatus for PCM-encoding NTSC color television at s Method and apparatus for PCM-encoding NTSC color television at s

1976-09-29

1977-12-27

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 932

Patent

active

040657841

ABSTRACT:
NTSC television signals are digitally encoded at sub-Nyquist rates by placing the alias components into those parts of the spectrum not normally occupied by the luminance or chrominance components of the video signal. In a system described, the sampling frequency, f.sub.s, is exactly 2f.sub.sc + 1/4f.sub.h or 2f.sub.sc - 1/4f.sub.h, where f.sub.sc is the NTSC color subcarrier frequency and f.sub.h is the line-scan frequency. Most of the alias signals in the thus encoded signal are removed from the baseband video by comb filtering between f.sub.s - f.sub.y and f.sub.v, where f.sub.v is the baseband video bandwidth.

REFERENCES:
patent: 3858240 (1974-12-01), Golding et al.

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