Digital video signal processing system

摘要

A signal separator performs an inter-line operation on a composite color video signal, thereby separating it into a luminance signal and a chrominance signal. A scan converter converts each of the luminance signal and the chrominance signal into a sequential scan signal on the basis of the double-speed changing of the luminance signal and the chrominance signal. A signal determination circuit determines whether the composite color video signal is a standard signal or a non-standard signal. A first clock producer produces first clocks to be phase-locked to a color subcarrier in accordance with the composite color digital video signal. A second clock producer produces second clocks to be phase-locked to horizontal synchronizing signals in accordance with the composite color digital video signal. A first controller causes the signal separator and the scan converter to operate in accordance with the first clocks when the signal determination circuit determines that the signal is a standard signal. A second controller causes the signal separator to operate in accordance with the first clocks, causes the scan converter to operate in accordance with the second clocks, and converts a sampling rate of each of the luminance signal and the chrominance signal separated by the signal separator in accordance with the first clock into a rate of the second clocks when the signal determination circuit determines that the signal is a non-standard signal.