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    • 10. 发明专利
    • JP2975607B2
    • 1999-11-10
    • JP6552889
    • 1989-03-16
    • SANYO DENKI KK
    • SATOMI HIDEO
    • H04N9/793H03L7/10H03L7/191H03L7/199H04N5/12H04N5/932H04N5/95H04N9/89
    • An AFC circuit for use in a chrominance signal processing circuit of a VTR basically includes a VCO (9), a frequency divider (10-13) for frequency-dividing an output of the VCO, and a phase comparing circuit (17) for comparing phases of the output of the divider and a horizontal synchronizing signal extracted from an inputted video signal to supply an error output to the VCO. When a phase relation between the output of the divider and the horizontal synchronizing signal becomes a miss-locked state out of the phase-locked state, a frequency-dividing operation is stopped at a timing corresponding to the rising edge rise of a normally inputted signal in a phase-locked state and the frequency-dividing operation is restarted after the inputted horizontal synchronizing signal is counted (22) by a predetermined number. As a result, the phase-locked state of the inputted horizontal synchronizing signal and the output signal of the divider (10-13) is forcibly restored.