A control track is a
track that runs along an outside edge of a standard
analog videotape (including
VHS). The control track encodes a series of
pulses, each pulse corresponding to the beginning of each
frame. This allows the video tape player to synchronize its
scan speed and tape speed to the speed of the recording. Thus, the recorded control track defines the speed of playback (e.g. SP, LP, EP, etc), and it is also what drives the relative counter clock that most
VCRs have.
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