Television – Synchronization – Sync generation
Reexamination Certificate
2007-05-08
2007-05-08
Tran, Trang U. (Department: 2622)
Television
Synchronization
Sync generation
C348S522000, C348S524000, C348S525000
Reexamination Certificate
active
11265073
ABSTRACT:
A circuit for generating video synchronization timing signals includes a negative peak detector (FIG.5) for following variations of a composite video signal (FIG.1), rather than clamping the most negative voltage of the composite video signal. The negative peak detector provides a voltage level VTIP representative of the voltage at the synchronization tip of the composite video signal. A sample and hold circuit (700,702,704) is used to add an offset VSLICE to VTIP, VSLICE being a voltage level of the breezeway, color burst, or back porch segments of the composite video signal, or a combination of these segments. To prevent amplifier DC offset error voltages from affecting the perceived VSLICE level, an amplifier (800) can be connected in a first position TTIP as part of a negative peak detector to store VTIP on a capacitor, in a second position TH as part of a sample and hold circuit to store VREF on a capacitor, and in a third position TCOMP to compare VSLICE+VTIP measured from the capacitors with the composite video signal to generate the overall circuit output.
REFERENCES:
patent: 3706847 (1972-12-01), Smeulers
patent: 4115811 (1978-09-01), Goff
patent: 4185299 (1980-01-01), Harford
patent: 4550342 (1985-10-01), Buchanan et al.
patent: 4667235 (1987-05-01), Nozoe et al.
patent: 4707730 (1987-11-01), Alard
patent: 4821098 (1989-04-01), Smeulers
patent: 4918525 (1990-04-01), Vladkov
patent: 5280356 (1994-01-01), Hiramatsu et al.
patent: 5486869 (1996-01-01), Cooper
patent: 5576770 (1996-11-01), Rumreich
patent: 5754250 (1998-05-01), Cooper
patent: 5867222 (1999-02-01), Norris et al.
patent: 6028642 (2000-02-01), Rinaldi et al.
patent: 6154256 (2000-11-01), Bruins
patent: 6208173 (2001-03-01), Redman-White
Elantec Semiconductor Inc.
Fliesler & Meyer LLP
Tran Trang U.
LandOfFree
Alternative video sync detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Alternative video sync detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alternative video sync detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3768465