| 摘要 |
PURPOSE:To detect the peak of a burst signal at a low speed circuit by detecting the level of a recording low area converting chrominance signal or reproducing carrier chrominance signal by a low area converting chrominance signal and controlling so that the burst level of the low area converting chrominance signal can be constant. CONSTITUTION:At recording, a recording low area converting chrominance signal which passes through LPF9, are fetched by a change-over circuit 16. At reproducing, a low area converting chrominance signal after passing a variable gain amplifier 3 is fetched, and a burst part only of the carrier chrominance signal is extracted by a burst gate 17. The burst is detected at the peak level by a detecting circuit 18, and the detected result, after suppressing a sudden change through LPF19, is supplied to an amplifier 3 as a control signal. As a result, the burst level of a low area converting chrominance signal is controlled so as to keep it constant. |
