| 摘要 |
PURPOSE:To mask a video signal retaining a visible feeling on a screen by supplying a reproduction video signal to a horizontal synchronizing signal passing means and by selecting and passing a horizontal synchronizing signal of the reproduction video signal. CONSTITUTION:A delay pulse generator circuit 34 is triggered by a fall of a sound recording control signal (d), and generates a delay pulse (f) which can last for a Ts period from an interference recess time point t2. The pulse (f) connects variable contacts 31c and 32c of switches 31 and 32 to fixed contacts 31b and 32b, and a signal (e) from a switch 22 is supplied to a waveform operating circuit 33, which clips a reproduction video signal at a black level during a period when the pulse (f) lasts, and simultaneously clamps it at the black level or a pedestal level. In this case, if the delay pulse generating period Ts is set equal to a skew generating period, the skew can be masked. |
