| 摘要 |
PURPOSE:To eliminate noise on a reproduced picture at the time of switching by synchronously switching the output of a head with a horizontal scanning synchronizing signal at a timing which does not appear on the reproduced picture. CONSTITUTION:A synchronizing circuit 6 holds a switching signal inputted from a level comparator 3, waits for the input of the horizontal synchronizing signal HS and outputs to a head output selecting circuit 4. Thereby, the switching signal inputted from the level comparator 3 is outputted to the head output selecting circuit 4 at the timing which does not appear on the reproduced picture and it is cancelled that the noise at the time of switching the head switching selecting circuit 4 appears on the visible part on the reproduced picture.
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