Video signal processing device for sampling TV signals to produc

Television – Synchronization – Automatic phase or frequency control

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Details

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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