A term used in electronics to describe the precise matching of two waves or functions. In television and video, sync is an essential element in the video signal to keep the scanning processes in phase. The sync signal instructs the monitor as to the exact moments at which a frame or line starts and ends. This information is critical for the proper positioning of the image on the screen. When a sync signal is distorted or missing, the picture may lose stability. It may become garbled to the point of total image breakdown. Electronic circuitry in many video processing devices provides sync restoration and correction. Sometimes a TBC is required to recover or restore sync. (See Horizontal and Vertical Sync).
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