SCH DETECTOR

PROBLEM TO BE SOLVED: To provide an SCH(sub-carrier to horizontal) detector, applying digital processing to a television signal that detects an SCH of an input signal. SOLUTION: The SCH detector is provided with an analog/digital converter, that converts an analog video signal (including its synchronous part and its video part) into a digital signal, a system clock generator, that generates a system clock signal to sample a reference point 0H of the horizontal synchronizing signal component in the analog video signal or points in the vicinity of the reference point 0H, a digital color demodulation section, that has a sin/cos table outputting sin/cos signals to color burst parts of a quantized color component signal, in a phase-coupled manner with them and applies color demodulation on the color component signal, on the basis of the signals outputted from the sin/cos table, a reference point 0H extract circuit section that extracts a signal in a timing related to the reference point 0H, and SCH measurement register that receives address information of the sin/cos table and a signal from the reference point 0H extract circuit section and a table, that converts an output signal from the SCH measurement register into phase angle data.