Picture-Synchronous Magnetic Tape Recording
D. G. C. Hare, W. D. Fling · Journal of the Society of Motion Picture and Television Engineers · 1950
Quarter-inch magnetic tape offers considerable economic and operational advantages for the recording of sound track material. The theory and basic design of a system which provides completely adequate synchronization of the sound with the picture arc discussed. Various methods of automatically framing the sound track and picture arc considered, and a simple system capable of rapid framing is described.