H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/85
H04N 5/04 (2006.01) H03L 7/095 (2006.01) H03L 7/10 (2006.01) H03L 7/191 (2006.01) H03L 7/199 (2006.01) H04N 5/073 (2006.01)
Patent
CA 1293800
Abstract of the Disclosure A circuit for extracting phase averaged horizontal timing with high noise immunity and for rapidly acquiring a video signal from a composite synchronizing signal generates an output signal at the horizontal sync rate, the output signal having leading edges occurring at the leading edges of the horizontal sync pulses of the composite synchronizing signal. The rate of the output signal is phase averaged by comparing the respective leading edges of the output signal and the composite synchronizing signal within a window centered about the leading edges of the output signal. Differences in the phases of the respective leading edges result in an error signal which is used to adjust the rate of the output signal to obtain coincidence of the respective leading edges. The occurrence of the leading edges of the composite synchronizing signal within the window is used to lock the circuit. Failure of the leading edges of the composite synchronizing signal to occur within the window due to a change in video source results in unlocking the circuit and resetting the output signal to a new composite synchronizing signal.
562925
Boyce Rory W.
Grass Valley Group Inc. (the)
Kirby Eades Gale Baker
LandOfFree
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