Method and apparatus for synchronizing internal and external vid

Details Method and apparatus for synchronizing internal and external vid Method and apparatus for synchronizing internal and external vid

1996-02-20

1998-05-05

Grant, Christopher C.

Television

Synchronization

Locking of video or audio to reference timebase

348536, H04N 9475

Patent

active

057482527

ABSTRACT:
An automotive video display of a scene from a camera has a graphics window to display vehicle information. A video graphics controller has a programmable synchronous generator for the graphics window which is synchronized or gen-locked with the camera or external video signal. A digital sync separator provides digital external sync signals. A start circuit monitors the external sync signals to detect the start of a video frame and starts the sync generator which is initially in synchronism with the external signal. A phase locked loop maintains the synchronism. A crystal oscillator circuit includes an inductor and a varactor which is tuned to vary the oscillator frequency enough to track the external video signal.

REFERENCES:
patent: 3619803 (1971-11-01), Klein
patent: 4038683 (1977-07-01), Thorpe et al.
patent: 4498103 (1985-02-01), Aschwanden
Elantec, Inc. brochure, EL4584C Genlock, 1993.

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