TRACKING AND SCREEN COMPENSATION CIRCUIT AND CONTROL METHOD FOR VTR

摘要

The circuit used in a video cassette recorder comprises a microcomputer (10) for receiving a head switching pulse, a conrol pulse, an envelope level and a drop-out compensation pulse to generate a tracking data and a control signal for compensation of the picture quality, a servo section (20) for executing a servo function and controlling the tracking the prepare the head switching pulse and control pulse for the microcomputer, a video processor (30) for outputting the video envelope signal and drop-out compensation pulse, a first picture quality compensator (40), a second picture quality compensator (50), an envelope detector (60) and a drop-out compensation pulse buffer (70).