| 摘要 |
PURPOSE:To miniaturize color VTR by sharing a burst gate circuit and ACC detecting circuit in a chrominance difference signal ACC loop in recording mode and in reproduction mode. CONSTITUTION:Burst gate circuit 30 is supplied with the output signal of recording ACC amplifying circuit 7 and a reproduced chrominance difference signal from BPF24. In recording mode, a signal input from amplifying circuit 7 is selected with a selective signal from terminal 34 to extract its burst signal and in reproduction mode, the reproduced chrominance difference signal is selected to extract its burst signal. Next, ACC detecting circuit 31, having received them, generates a control voltage proportional to the magnitude of the burst signal from gate circuit 30 and supplies it as gain control signal to amplifying circuit 7 and reproducing ACC amplifying circuit 21 to form an ACC loop. |
