Television – Synchronization – Automatic phase or frequency control
Patent
1996-12-16
1998-11-24
Lee, Michael H.
Television
Synchronization
Automatic phase or frequency control
327152, 327153, 348512, H04N 9475
Patent
active
058414827
ABSTRACT:
A synchronization system aligns video signals without the use of a phase locked loop. One embodiment includes a delay line and a selection circuit. A clock signal with a desired frequency for a pixel clock is applied to the delay line to generate a series of delayed signals at taps on the delay line. When a transition in a horizontal sync signal occurs, the selection circuit senses delayed signals and selects a delayed signal having a transition aligned relative to the transition in the horizontal sync signal. This delayed signal is a pixel clock signal which is not subject to frequency fluctuation of a phase locked loop. Selecting a new delayed signal at each horizontal blanking period keeps the pixel clock for each line of video aligned to the horizontal sync signal.
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Hwang Guorjuh T.
King Sherman Tan
Wang Niantsu N.
AuraVision Corporation
Lee Michael H.
Millers David T.
Ogonowsky Brian D.
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