SYNCHRONIZING FEEDBACK CIRCUIT AND SYNCHRONIZING FEEDBACK METHOD

PROBLEM TO BE SOLVED: To provide the synchronizing feedback circuit by which disturbance of an image and fluctuation in a gain or the like are not caused even on the occurrence of noise in an input signal such as a video signal and to provide the synchronizing feedback method. SOLUTION: A SYNC separator 2 separates a horizontal synchronizing pulse from an input image signal Vin from a DC offset circuit 1 and provides an output of it to a pulse generator 3 as a separator output signal S. The pulse generator 3 generates a clamp pulse K delaying the separator output signal S by a width of the horizontal synchronizing pulse and the clamp pulse K is fed to an operating pulse control section 30. When a pulse resulting from noise is included in the clamp pulse K, the operating pulse control section 30 interrupts the noise pulse and provides an output of a clamp pulse K' including only a proper pulse to a clamp detector 4.