H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/44, 350/70
H04N 9/04 (2006.01) H04N 9/78 (2006.01) H04N 11/14 (2006.01)
Patent
CA 1303727
ABSTRACT OF THE DISCLOSURE: The present disclosure describes a color video signal encoding system for generating a NTSC color image composite signal for a television receiver. A luminance signal Y and two chrominance signals I and Q are modulated on a color subcarrier having a frequency FsC. The televi- sion receiver has an intrafield vertical sampling frequency F1. The encoding system comprises a first non separable two dimensional filter for low pass filtering the chrominance signal I, and a second non separable two dimensional filter for low pass filtering the chrominance signal Q. A third non separable two dimensional filter is used for band-stop filtering the luminance signal. The third filter has a stop band centered on ? FsC and ? F1/2. The stop band has a shape similar to the shape of the band pass of the first filter so that said chrominance signals I and Q filtered by said first and second filter means can be inserted in the band covered by said stop band. The encoding system also comprises a modulator connected to the output of the first and second filter and an adder for adding signals generated by the third filter and the modulator, and generating a signal representative of the NTSC color image composite signal. The present disclosure also describes a color video signal decoding system and two methods for respectively encoding and decoding the NTSC color image composite signal.
545637
Dubois Eric
Faubert Pierre
Institut National de La Recherche Scientifique
Robic
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