Coincident Sound for Home Movies Provided by Tape Recorders
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.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.