| 摘要 |
PURPOSE:To obtain a sampling clock to receive a character multiplex signal by comparing a clock line phase with an output phase of five latch circuits so as to lead an output data of a phase closest to the clock line signal. CONSTITUTION:An analog video signal including a character multiplex signal is inputted to a terminal 21. A data series of period TX1/2 interval is formed in a simulating way by the interpolation method from a digital data series sampled at each digital data series at each period T=1/4fsc (fsc = frequency of subcarrier) from a video signal by an interpolation data generating circuit 25. Then the data series of period TX1/2 interval is sampled by latch circuits 281-285 once per five times. Thus, the data series sampled at an interval of 5/8fsc of a phase of 5 kinds. Then a decision circuit 30 selects a data having the closest phase with the clock line signal.
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