Automatic phase adjustor for video camera.

摘要

An automatic phase adjustor for a video camera is provided for carrying out phase matching in accordance with the phase-correcting amount freely set from the external however delayed the signal is in a video-signal processing system. A first counter (3) supplies a pulse for driving an imaging element (1) to a phase shifter (6). The phase shifter (6) serves to delay the pulse by the amount of delay appearing in the processing circuit (5). The delayed pulse is input to a phase comparator (10). The phase comparator (10) compares the delayed pulse with a pulse sent from a second counter (8) for generating a synchronous signal. Based on the compared result, a gate circuit (9) is interrupted so that the horizontal phase difference between the video signal sent from the imaging element (1) and the synchronous signal sent from the second counter (8) may reach zero when both of the signals reach an encoder (7) for combining them. <IMAGE>