| 摘要 |
PURPOSE:To correct drop-out to prevent the occurrence of buzz of an RF converter, by controlling the level of the reproduced video signal, which is inputted to the RF converter, when drop-out occurs in the video signal reproduced from a recording medium. CONSTITUTION:The FM video signal reproduced from a magnetic tape is given to an input terminal 1 and is supplied to a drop-out compensating circuit 11 consisting of a MIX circuit 2, a 1H delay line 3, a gate circuit 4, and a drop-out detecting circuit 5. When drop-out occurs in the input signal, the circuit 5 detects the drop-out and leads out the detection output to one input of the gate circuit 4. The circuit 4 permits the output of the delay line 3 to pass through and gives it to the other input of the circuit 2. Consequently, the FM video signal from the terminal 1 and the FM video signal from the circuit 4 are superposed to correct the drop-out of the FM video signal. The output of the circuit 5 is given to a switch circuit, and the gain of a video amplifying circuit 8 is lowered to take out the video signal of a level lower than the normal level. |
