Horizontal picture centering

摘要

This invention permits horizontal centering of a television picture on the screen. Signals normally present within a television receiver are used to generate intermediate signals for centering the picture. The method of operation provides satisfactory noise immunity while maintaining adequate display characteristics. A two loop system is used. The first loop receives the horizontal sync and generates an intermediate signal in response. The second loop variably delays the intermediate signal to create a signal which is phase locked to the flyback signal. In this fashion, the flyback signal may be made to be symmetric with the horizontal blanking interval rather than the horizontal sync pulse, thus centering the video information on the screen.