Video signal processor

Details Video signal processor Video signal processor

G - Physics

09

G

G09G 5/18 (2006.01) G09G 3/20 (2006.01) H03L 7/06 (2006.01) H03M 1/12 (2006.01) H04N 5/14 (2006.01) H04N 5/66 (2006.01) H04N 5/12 (2006.01)

Patent

CA 2321291

A phase control circuit sets the phase of a sampling clock signal for A/D conversion of a video signal in order. A binarizing circuit binarizes an analog video signal. A first counter circuit counts the changes of the output signal of the binarizing circuit. An A/D converting circuit digitizes the input signal. A second counter circuit counts the changes of the most significant bit of the A/D converting circuit. A subtracting circuit subtracts one from the other of the output signals of the two counter circuits. By changing the phase of the sampling clock signal of the A/D conversion in order within one period, the subtraction results are found, and this process is repeated for one or more periods. Thus the phase of the optimum sampling clock is set according to the subtraction results.

Selon l'invention, un circuit (5) de commande de phase règle la phase d'un signal d'horloge d'échantillonnage, aux fins de conversion analogique/numérique d'un signal vidéo, un circuit de binarisation (6) binarise un signal vidéo analogique, un premier circuit de comptage (7) compte les changements du signal de sortie du circuit de binarisation (6), un circuit de conversion analogique/numérique (2) numérise le signal d'entrée, un second circuit de comptage (8) compte les changements du bit de poids fort du circuit de conversion analogique/numérique (2), et un circuit de soustraction (9) soustrait, l'un de l'autre, les signaux de sortie des deux circuits de comptage. En changeant la phase du signal d'horloge d'échantillonnage de la conversion analogique/numérique, à l'intérieur d'une période, on obtient les résultats de la soustraction, ce procédé se répétant pendant une ou plusieurs périodes. Ainsi, la phase du signal d'horloge optimal d'échantillonnage est réglée en fonction des résultats de la soustraction.

Affiliated with

Also associated with

Rating

Video signal processor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Video signal processor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal processor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1933426