How to add sound to amateur films (1954)

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The Choice of Systems The main methods of sound recording we shall be concerned with are disc recordings, optical (photographic) sound tracks on the film, magnetic tape and wire recordings, and magnetic stripe tracks on the film. None of these systems is ideal in every respect, but each method has its particular advantages and drawbacks. Your choice will necessarily be a personal decision striking a balance between many factors. At least one of them is the equipment you already have at hand. Thus if you have a sound-on-film projector, optical sound recording is worth considering. But if you use 8-mm. film, this method is out Systems of sound recording. A microphone converts sound waves into electrical pulsations. After amplification, these can be recorded mechanically on disc, optically on film, or magnetically on tape. Gramophone Disc Magnetic Tape 40