Patent ID: 8421920

Claim:
A method of automatically adjusting a phase of a quantization clock signal for a video signal based on a received analogue video signal, the method comprising the steps of: determining a first phase that corresponds to a stable-period start position and a second phase that corresponds to a stable-period end position at each transition associated with transitions of a pixel encoded in the analogue video signal by sequentially changing an adjustable phase of the quantization clock signal, the transitions occurring between high and low levels of the analogue video signal, the first phase being a phase at which a first transition from a low level to a high level is ended, and the second phase being a phase at which a second transition from the high level to the low level is started; calculating, as an appropriate phase of the quantization clock signal, a phase between the first phase and the second phase; and setting the phase of the quantization clock signal to the calculated appropriate phase.