Synchronous processing device

Details Synchronous processing device Synchronous processing device

1996-11-06

2000-08-01

Peng, John K.

Television

Synchronization

Automatic phase or frequency control

348536, 348530, 348540, H03L 700

Patent

active

060974400

ABSTRACT:
A synchronous control device is disclosed which is capable of obtaining stable synchronization regardless of the kind of image source even when the automatic synchronous control circuit cannot operate in the normal manner.
The device includes a phase comparator, an integrator, a horizontal oscillation circuit, and a horizontal synchronous control circuit composed of a frequency measuring section consisting of a digital frequency measuring circuit, etc. and a control section consisting of a frequency determining circuit, an oscillation frequency control circuit, etc. The frequency measuring section measures the input horizontal synchronizing frequency and transfers it to the control section as digital data, and the control section determines the true value of the input synchronizing frequency by the frequency determining circuit while monitoring the transition of the frequency data per unit time. The oscillation frequency control circuit performs control to adapt the oscillation frequency of the horizontal oscillation circuit to the determined true value, whereby a highly accurate synchronous control is possible.

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