| 摘要 |
PURPOSE:To execute an adequate chroma level adjustment, by generating a reproducing equalizer control signal from level information of a reproducing burst signal and level information of a reproducing signal, and making a chromaticity signal automatically conform with a reproducing picture signal level. CONSTITUTION:A reproducing RF signal 1 is sent to a demodulator 3 after its frequency characteristic is adjusted by a reproducing equalizer circuit 2, and is demodulated to a reproducing picture signal 4. This signal 4 is sent to a reproducing burst signal level detector 5 and a reproducing signal level detector 6, too. Subsequently, as for this signal, a burst signal in the reproducing signal is envelope-detected by the detector 5, its peak value is sampling-held, and a burst signal level information signal 7 is obtained and is sent to a differential amplifier 9. Also, as for the signal 4, a synchronizing signal in the reproducing signal is sampling-held by the detector 6, and a synchronizing signal level information signal 8 is obtained and is sent to the amplifier 9. Subsequently, a difference signal is fed back as an equalizer control signal 10 to the equalizer circuit 2 from the amplifier 9. |
