Frame Numbering of Television Tape Recording
E. Stanley Busby · Journal of the SMPTE · 1970
A phase-modulated data signal for recording TV frame numbers on the cue audio track is described. Each frame period includes a series of binary-coded decimal (BCD) numbers arranged in hours, minutes, seconds and frames, and an additional data period for logging information. Also included is a synchronizing interval which marks the end of each frame, and from which tape speed and direction are sensed. Preamplifier requirements for playback over a wide speed range are discussed.