JPS56158579A - Ghost erasing device - Google Patents

Abstract

PURPOSE:To use only the transversal filter circuit and to simplify a ghost eraser, by automatic and optimum connection of a tapped delay circuit in which a plurality of weightings are possible with short time width and a plurality of fixed delay circuits. CONSTITUTION:A video signal picked up from a TV receiver is fed to an A/D conversion circuit 2 via an input switching circuit 11, and it is converted to a digital value at the circuit 2 and inputted to an operation processing circuit 3. Further, a video signal is separated at a timing signal generating circuit 4 to generate the timing signal to detect specific sections taking the synchronizing signal as the reference and it is fed to the circuit 3. At this circuit 3, operation is made and the output after discrimination of condition is fed to a weighting circuit 10 and a delay switching circuit 7 taking the video signal as the input. Further, the output of M sets of fixed delay circuits 6-1-6-M is fed to N sets of tapped delay circuits 5-1- 5-N, the respective outputs are added at an addition circuit 8, the output of the circuit 8 is fed to a switching circuit 11, allowing to connect the circuits 5-1-5-N and 6-1-6-M automatically in optimum condition.