A Method of Locking a Multichannel Non-Sprocketed Tape Recorder to a Film-Distributor System
Robert Z. Langevin · SMPTE Motion Imaging Journal · 1972
A non-sprocketed tape recorder can be slaved to sprocketed film equipment, following in frame coincidence through repeated forward, stop, or reverse cycles. A pulse-counting technique has been developed to maintain synchronism, with the initial start made from visual cue marks on tape and film. The pulse source for the tape recorder is a control track, and for the film, a tachometer mechanically coupled to the distributor or projector.