The versatility of a dc capstan servo simplifies synchronization of audio recorders to each other, to video tape recorders or to sprocketed film equipment. Several systems will be described, including pilot tone resolving, video lock and film lock, all of which use pulse counting techniques. A system which uses an address code can offer further advantages. The SMPTE code and how one system uses it to synchronize as many as six tape transports will be described.
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