| 摘要 |
<p>PURPOSE: To automatically control the trigger position of a clamp signal by discriminating the existence of a synchronizing ON green signal and outputting a logic signal. CONSTITUTION: When a green signal or a synchronizing ON green signal is inputted to a synchronizing signal separation part 10, the separation part 10 separates a synchronizing signal and supplies the separated synchronizing signal to a synchronizing selection part 11. When the synchronizing signal outputted from the separation part 10 and a horizontal/vertical synchronizing signal are simultaneously inputted, the selection part 11 outputs a synchronizing signal selectively inputted by previously set priority to a clamp signal control part 30, a clamp signal generation part 29 and a horizontal/vertical synchronization separation part 13. The generation part 29 triggers a clamp signal at the edge of the synchronizing signal and outputs the triggered clamp signal. At the time, the control part 30 inputs signals outputted from the separation part 10 and the selection part 11, discriminates the existence of the synchronizing signal and then controls the clamp signal generated from the generation part 29. Thereby the trigger position of the clamp signal can be automatically controlled.</p> |
