H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33
H04N 7/12 (2006.01) H04N 11/04 (2006.01)
Patent
CA 1129989
C-1406 ABSTRACT OF THE DISCLOSURE A sub-Nyquist sampled PCM NTSC color television signal obtained directly from a PCM encoded color television signal sampled at four times the color sub- carrier frequency by selecting every other sample in each line of the 4Fsc sampled television signal and introduc- ing a one 4Fsc 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 Fsc by generating a sampling signal having a frequency of 2Fsc, the sampling phase of which shifts by 180° every alternate/time sequented televison 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 4Fsc samples can be reconstructed when comb filters are used to remove alias components. The process of converting 4Fsc encoded signals to sub-Nyquist and back to 4Fsc can be repeated without impairing picture quality beyond that introduced during the first conversion - reconversion process. - 1 -
335824
Cbs Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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