Television – Image signal processing circuitry specific to television – A/d converters
Reexamination Certificate
2006-02-16
2010-11-02
Ometz, David L (Department: 2622)
Television
Image signal processing circuitry specific to television
A/d converters
C348S537000, C348S536000, C348S739000
Reexamination Certificate
active
07825990
ABSTRACT:
A method and apparatus for an analog-to-digital video signal converter. The converter is controlled by a clock with controllable frequency and phase for sampling an analog signal. A circuit corrects the clock frequency using a period of a columnar frame differences as a function of columnar location. The sampling clock frequency is changed by an amount dependent on the period of the columnar differences. A second measure of the difference between successive frames is computed for a sequence of clock phases. The frequency of the clock is verified using a characteristic of the second measure. The characteristic can be the ratio of the maximum to the minimum of the second measure over selected clock phases. Other characteristics can be used such as a difference of a maximum and a minimum measure.
REFERENCES:
patent: 5767916 (1998-06-01), West
patent: 5805233 (1998-09-01), West
patent: 5847701 (1998-12-01), Eglit
patent: 5990968 (1999-11-01), Naka et al.
patent: 6097444 (2000-08-01), Nakano
patent: 6700570 (2004-03-01), Tachibana et al.
patent: 7486336 (2009-02-01), Huang et al.
patent: 7502076 (2009-03-01), Xiu et al.
Dickinson Larry D.
Ethridge Troy Lane
Hayden John Michael
Ouyang Bing
Sundararajan Anuradha
Brady III Wade James
Brill Charles A.
Désir Jean W
Ometz David L
Telecky , Jr. Frederick J.
LandOfFree
Method and apparatus for analog graphics sample clock... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for analog graphics sample clock..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for analog graphics sample clock... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4189322