SCREEN CHATTERING PREVENTING CIRCUIT OF CAR AUDIO/VIDEO SYSTEM

PURPOSE: A screen chattering preventing circuit of a car audio/video system is provided to stabilize the synchronization of an image signal output from an image processor. CONSTITUTION: A screen chattering preventing circuit of a car audio/video system includes a television tuner(20), an intermediate frequency processor(30), a voice processor(40), a speaker(50), a liquid crystal display(60), an inverting transistor(Q1) and a recovery transistor(Q2). The television tuner(20) is controlled by a micro computer(10). The intermediate frequency processor(30) receives an image reception signal output from the television tuner. The inverting transistor(Q1) is turned on when the image signal output from the intermediate frequency processor is applied on a base node via a capacitor(C1), inverses the input image signal and outputs the inversed signal through a collector node. The emitter of the inverting transistor is grounded. The recovery transistor(Q2) is turned on when the image signal output which is inversed is applied on a base node, inverses the inversed input image signal again and outputs the recovered signal through a collector node.