The Practical Aspects of the Color Subcarrier Synchronization Problem

In NTSC color television, a burst of reference carrier is transmitted at the end of each horizontal scanning line. The fundamental frequency component of this burst is being used in the color receiver to recover the chroma information of the transmitted signal in two synchronous detectors. The color subcarrier synchronization problem then consists of regenerating at the receiver the fundamental frequency component of the transmitted subcarrier burst accurately in frequency and phase.