| 摘要 |
PURPOSE:To obtain a burst gate signal having a delay time in response to the reproducing mode from a horizontal synchronizing signal by inputting the horizontal synchronizing signal to plural integration circuits having different time constant from each other and extracting selectively its output in response to the switching of the reproducing modes. CONSTITUTION:The horizontal synchronizing signal applied to the 1st integration circuit 2 is integrated by a time constant decided a capacitor and a coil, and the horizontal synchronizing signal applied to the 2nd integration circuit 4 is integrated by a time constant decided by a capacitor, a coil and a resistor, and the integration waveform is widened. The horizontal synchronizing signal outputted from the 1st and 2nd integration circuits 2, 4 is applied to a switching circuit 5, an output of the 1st integration circuit 2 is changed over at the normal reproduction and the output of the 2nd integration circuit 4 is changed over at the special reproduction selectively and they are applied to a burst gate circuit 3 as a burst gate signal. No burst signal missing takes place at the special reproduction even if a width of the horizontal synchronizing signal is narrowered by providing the integration circuit for the special reproduction, allowing to reproduce the burst signal with such condition. |
