TYPES OF SOUND FILM
There are two types of sound film, optical and magnetic. Optical film is used exclusively in the 16 mm cameras in the amateur field, though some Super-8 projectors can replay it. The sound track is recorded photographically along the edge of the film. When the film is projected, the track passes between an exciter lamp and a photoelectric cell, generating a series of electrical impulses which are amplified and converted to sound waves via a loudspeaker. However, the system is expensive and the photographic track has to be added by a commercial laboratory.
Fig. 27.8 A magnetic stripe to record sound can either be laminated ...
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