ON-VEHICLE TELEVISION VIDEO PROCESSOR

摘要

PROBLEM TO BE SOLVED: To appropriately switch the moving picture of a received television video and a still picture when reception is defective by limiting the decision object of permission/non-permission on the disturbance of a detected synchronizing signal only to a partial window area selected/extracted by a window extraction circuit. SOLUTION: The decision object of permission/non-permission on the disturbance of a detected synchronizing signal is limited only to a partial window area selected/extracted by a window extraction circuit. In the device, a horizontal synchronism decision circuit 36 selects only a prescribed window area in a display area from all objective horizontal scanning lines and inputs the selection result to a limit output circuit (AND circuit) by a window extraction circuit WC. In such a case, an OR circuit OR 1 operates the low active OR of an output result on window area from first and second window extraction parts WC1 and WC2 and transmits an obtained signal to the limit output circuit LC.