Video signal processing device for sampling TV signals to produc

Details Video signal processing device for sampling TV signals to produc Video signal processing device for sampling TV signals to produc

1995-10-04

1997-08-12

Kostak, Victor R.

Television

Synchronization

Automatic phase or frequency control

348572, H03M 112, H03L 700

Patent

active

056570899

ABSTRACT:
An effective video interval detector detects an effective video interval of a digital video signal from an A/D converter, and outputs differential data indicative of the difference between the detected effective video interval and a required video data interval. A video signal supply interval controller produces frequency-dividing ratio control data depending on the differential data supplied thereto and supplies the frequency-dividing ratio control data to a programmable frequency divider to vary its frequency-dividing ratio. An output signal frequency from a voltage-controlled oscillator is now controlled to eliminate the difference between the effective video interval and the required video data interval. Even when a video signal supplying device is connected to a video signal source which produces a video signal having a different horizontal synchronizing frequency, the output signal frequency from the voltage-controlled oscillator can be brought into synchronism with the horizontal scanning frequency of the video signal from the video signal source for thereby enabling the A/D converter to sample the effective video interval in a desired number of samples.

REFERENCES:
patent: 4958228 (1990-09-01), Kutsuki
patent: 5184091 (1993-02-01), Srivastava

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