Video wiper / Nik Adnan Nik Abdullah and Zulkefle Husain

The main objective of designing the video wiper is to produce a blanked out modulation signal of the video input signal at the beginning of each frame and controlling it during the periods required. The modulation signal of the video input signal will be clipped of the diode clipper circuit but leaves the sync signal intact. The wipe effect can be obtained applying a suitable signal to the control input of the electronic changeover switch. When the picture is required, the direct video signal is switched through to the output. When the lanked screen is required the clipped signal in fed through to the output.