Abstract: A method and device are provided for correcting an amplitude of a synchronizing signal. A pedestal voltage, Vped, (i.e., a reference level) may be detected which repetitively occurs at the same period as a synchronizing signal of an input composite video signal. A reference voltage, Vsync, may be generated corresponding to an amplitude of the synchronizing signal which meets a standard for the input composite video signal. A DC voltage, Vh, may be generated having a voltage level corresponding to a tip or peak level of the synchronizing signal which meets the standard for the input composite video signal based on the pedestal voltage, Vped, and the reference voltage, Vsync. The DC voltage Vh and the composite video signal may be switchably output in synchronism with the synchronizing signal extracted from the composite video signal.