REFERENCE SIGNAL GENERATING CIRCUIT FOR REMOVING GHOST

摘要

PURPOSE:To improve performance removing a ghost by overlapping a digital signal string whose transmission speed is larger than that of the doubled video band of a television signal and using said overlapped string as a ghost removal reference signal. CONSTITUTION:A timing generating circuit 2 generates a transmission clock larger than the doubled video signal band with the aid of a television signal string generating circuit 1. A digital signal string generating circuit 4 generates the digital signal string at the timing of the transmission clock in synchronization with a color subcarrier frequency, and a signal overlap circuit 3 overlaps the digital signal string with a television signal. Since power that the digital signal string has is greater than that of a single pulse, the influence due to noise can be reduced if the digital signal string is used as a reference signal.