Coincident Sound for Home Movies Provided by Tape Recorders

Whitaker JN. Coincident Sound for Home Movies Provided by Tape Recorders. J Audio Eng Soc. 1957;5(1):36-41. Available from: https://aes.org/publications/elibrary-page/?id=282

@article{Whitaker1957_282,
  author = {Whitaker, James N.},
  title = {{Coincident Sound for Home Movies Provided by Tape Recorders}},
  journal = {Journal of the Audio Engineering Society},
  volume = {5},
  number = {1},
  pages = {36--41},
  year = {1957},
  month = jan,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=282}
}

TY  - JOUR
TI  - Coincident Sound for Home Movies Provided by Tape Recorders
AU  - Whitaker, James N.
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 5
IS  - 1
SP  - 36
EP  - 41
PY  - 1957
DA  - 1957/01/06
UR  - https://aes.org/publications/elibrary-page/?id=282
PB  - Audio Engineering Society
LA  - en
AB  - When taped sound must accompany the showing of a motion picture, problems of synchronization arise. This paper describes a simple, widely applicable regulator system for recording such sound, in which a high degree of synchronization is assured. As the film is run through the projector, the accompanying sound is taped on a half-track tape recorder. An auxiliary head simultaneously records a 60 cps tone derived from the projector power source upon the adjoining track. In playback, this tone, suitably amplified, drives a small auxiliary synchronous motor which, by appropriate gearing, controls the projector speed. Errors which may arise from stretched tape, tape creep, and line frequency variations are thus eliminated. Details of a typical system are presented, together with a description of the modifications which must be made on the tape recorder and the film projector.
ER  -