| 摘要 |
<p>An automatic phase-control circuit for a reference sub-carrier oscillator of color television receivers, which includes a phase comparing means for comparing a phase of output of the reference sub-carrier oscillator with a phase of a burst signal in a color television signal received by the receiver to control the reference sub-carrier oscillator in synchronism with the burst signal with the phase-compared output. A peak-detector means is provided to detect a peak voltage value of the output of the phase comparing means to produce a direct voltage in response to that value, so that a control signal sufficient for stable and effective control of the reference sub-carrier oscillator is obtained.</p> |
