Patent ID: 7515211

Claim:
A video signal processing circuit that samples an analog composite video signal, converts the composite video signal to a digital signal, and processes the composite video signal by using a prescribed clock signal, comprising: a clock generating means generating the prescribed clock signal; a phase detecting means detecting color subcarrier phase information in each line of the composite video signal; a phase difference calculation means calculating a phase difference between phase information obtained from the phase detecting means and a prescribed reference phase, calculating a phase correction from the phase difference, and outputting the phase correction, said phase difference calculation means including a delaying means applying a delay of a prescribed number of lines or fields to the phase information from the phase detecting means; a sampling phase conversion means correcting the phase at which the composite video signal is sampled according to the phase correction output from the phase difference calculation means; and a luminance/chrominance (Y/C) separation means separating a luminance signal and a chrominance signal from the composite video signal output from the sampling phase conversion means.