TH22749B - Clamp pulse circuit - Google Patents

Abstract

A clamp-on pulse generating circuit that includes Synchronized decision cycle for cutting Whether the external synchronization pulses are being imported or not. X Exclusive Or Circuit Switch Condition and pulse width sensing circuit for judging that Pulse-filled video signal Is the synchronization being imported? And a pulse generating circuit for generating a clamp-type pulse that Front edge or back edge of the external synchronous pulse The output from the synchronizer separator circuit and the output of the clamp pulse at the front edge. That is selected by the selection switch when pulses are synchronized. External forces were able to import and force to choose. And output of a clamp pulse on the back edge Of pulses synchronize Regardless of the presence of external synchronous pulses When the picture signal Packing with synchronous pulses is being imported.

Claims (1)

1.Clamp pulse generation circuit That includes Synchronize input side end For importing external synchronous pulses; Decision Device, Synchronize For judging that such external synchronous pulses Is it being imported or not; Image input end for the import of image signals loaded with synchronized pulses; Image decision equipment for deciding whether such video signal Is it being imported or not; A pulse generating device for generating a clamp-on pulse at the edge: