Video display apparatus having phase-locked loop used for synchr

Details Video display apparatus having phase-locked loop used for synchr Video display apparatus having phase-locked loop used for synchr

1997-11-26

2000-01-11

Hsia, Sherrie

Television

Synchronization

Automatic phase or frequency control

348536, 348531, 348544, 331 11, 327156, H04N 506, H04N 512

Patent

active

060141778

ABSTRACT:
A video display apparatus comprises a phase-locked loop receiving a horizontal synchronous signal for generating an oscillation signal following the frequency of the horizontal synchronous signal, a tracking circuit for generating a tracking control signal for moving the frequency of the oscillation signal into a predetermined capture range of the phase-locked loop when the frequency of the horizontal synchronous signal changes, so that the frequency of the oscillation signal follows the frequency of the horizontal synchronous signal, and an output circuit receiving and amplifying the oscillation signal to output a horizontal output signal. The tracking circuit includes a switch circuit receiving the horizontal synchronous signal and the oscillation signal to supply the horizontal synchronous signal as a selected signal to the tracking circuit when the phase-locked loop is in an unlocked condition, and to supply the oscillation signal as the selected signal to the tracking circuit when the phase-locked loop is in a locked condition.

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patent: 5912713 (1999-01-01), Tsunoda

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