Synchronization of Remote Program Sources for Color TV Broadcasting

Abstract

For program integration all video sources must be in raster phase as well as in color phase. The usual color genlock technique permits the integration point to be in phase with only one of the sources at a time. Dissolves, special effects, etc., between any two remotes are therefore impossible. The Remote Sync System permits all of the remote points to be color- and raster-phased semiautomatically. Color and raster phase is available for a fixed time after the remote has been “talked-in.” Using an automatic video-delay line at the integration point and using highly stable subcarrier oscillators, the system provides hours of color and raster phase. This time can be even further extended if occasional manual corrections are made at the remote point or at the integration point.