VIDEO SIGNAL PROCESSING CIRCUIT

摘要

PURPOSE:To obtain a video signal processing for a TV receiver capable of reduction in the number of external terminals and its cost. CONSTITUTION:A video processing circuit has a defeat control circuit 27 which is constituted that the operation of an automatic frequency tuning circuit 26 is stopped by applying a prescribed control voltage (VB) to a control input terminal 7 led outside an integrating circuit, a noise cancelling circuit 28 rejecting noise pulses in a video signal, and a lockout preventing circuit 31. The time constant of the said lockout preventing circuit is determined by connecting a capacitor C1 to the said control input terminal 7. Since the number 7 terminal of the integrated circuit is used to connect the capacitor determining the integration time constant of the said circuit 31 to a control input terminal of the said circuit 27, the number of external terminals of the integrated circuit is reduced.