H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/50
H04N 5/38 (2006.01) H04N 5/073 (2006.01) H04N 5/225 (2006.01)
Patent
CA 2022350
A vertical phase adjust circuit with high noise immunity for line locked surveillance cameras. To prevent noise from the AC line producing false output signals, a counter is used to lock out the delayed vertical line locked output signal. The horizontal scan frequency is counted from the time a vertical output is produced, and the vertical output signal is prevented until 98 percent of the period between legitimate vertical signals has elapsed. The circuit also includes a lock detect circuit to increase the time window during startup conditions to assure initial synchronization and an increased phase adjust range to permit synchronization with any other camera.
Borden Ladner Gervais Llp
Burle Technologies Inc.
LandOfFree
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