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

1978-09-21

1980-10-07

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 932

Patent

active

042272041

ABSTRACT:
A sub-Nyquist sampled PCM NTSC color television signal is obtained directly from a PCM encoded color television signal sampled at four times the color subcarrier frequency by selecting every other sample in each line of the 4F.sub.sc sampled television signal and introducing a one 4F.sub.sc sample displacement every two sequential television lines. A sub-Nyquist sampled signal may also be obtained from an NTSC color television signal having a color subcarrier frequency F.sub.sc by generating a sampling signal having a frequency of 2F.sub.sc, the sampling phase of which shifts by 180.degree. every alternate time sequential television line, and sampling the NTSC color television signal in response to the sampling signal. Whichever of these two techniques is used to obtain the sub-Nyquist samples, the 4F.sub.sc samples can be reconstructed when comb filters are used to remove alias components. The process of converting 4F.sub.sc encoded signals to sub-Nyquist and back to 4F.sub.sc can be repeated without impairing picture quality beyond that introduced during the first conversion-reconversion process.

REFERENCES:
patent: 3858240 (1974-12-01), Golding et al.
patent: 4037248 (1977-07-01), Iijima et al.
patent: 4051516 (1977-09-01), Weston
patent: 4151550 (1979-04-01), Dinstein

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