| 摘要 |
PURPOSE:To separate easily a sound signal and a TV signal, and also to execute easily its demodulation, by analog-adding and recording a signal which pulse-encodes a synchronizing signal and a video signal, and a signal which pulse-encodes a sound signal. CONSTITUTION:A color TV signal is synchronizing-separated, and thereafter, a color burst signal and a video signal are extracted from a gate circuit 3 which is subjected to gate by an output of a waveform shaping circuit 7, and are supplied to a difference pulse encoding modulating circuit 8. They are difference- modulated from the circuit 8, and also a start bit is added and outputted. On the other hand, a sound signal is sampled from a difference encoding modulating circuit 10, also is difference-modulated and outputted, and thereafter, is compressed by a time compressing circuit 11, is positioned in a period of a horizontal synchronizing signal, and also a start bit is added and outputted. These output signals are added by an analog-adding circuit 12, and its output is supplied to a rotary magnetic head and is recorded in a magnetic tape. |
