Time base correction of television signals.

摘要

In a time base correction system, a composite color television analog signal derived from a prerecorded tape is converted by an analog-to-digital converter (14) to a digital signal having horizontal sync and color burst signal components. The digitized sync and burst signals are processed on a line-by-line basis to provide an error signal between input video and a sampling clock in the form of a binary control word. The error signal is applied to a digital frequency synthesizer (22) which generates a clock at the subcarrier frequency to achieve precise adjustment of frequency and phase of the A/D sampling clock with respect to the video signal.