| 摘要 |
PURPOSE:To reduce the deterioration of a descramble picture by equalizing a synchronizing signal leading level at the time of descrambling the synchronizing signal of a scrambled video signal to the synchronizing signal. CONSTITUTION:The PIN diode 27 in which the quantity of extension is controlled according to an extension quantity control voltage is provided in a synchronizing signal extension circuit 500 at the time of descrambling the scramble signal obtained by compressing the synchronizing signal by the synchronizing signal extension circuit 500 is provided. According to an extension quantity control voltage, a gain to a transistor 23 is controlled, and a control for aligning the leading level of an RF synchronizing signal after the descrambling is carried out based out based on this control voltage.
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