| 摘要 |
PURPOSE:To prevent a sound signal from being affected with switching noise, by time base-compressing the sound signal superimposed on a video signal in advance and recording the result at a location avoiding the switching of a head on a video track. CONSTITUTION:The sound signal is compressed at a sound signal time conversion circuit 12 comprising an LPF9, a storage circuit 10 and an LPF11 via a switch circuit 8 from a sound signal input terminal 7, and the suitable modulation for video recording is applied at a modulation circuit 14 through another switching circuit 13, and superimposed on the video signal at an adder 15. In this case, the sound signal is time base-compressed for several Hs so as to avoid the location of the head from being switched. This is time base-expanded again at the reproduction and restored to the original auido signal. |
