Sound Recording and Reproduction

Duration: 11

Year Published: 1943

Creator: erpi

Format: 16mm

Color: B&W

Description: Shows how the microphone transforms the kinetic energy of air waves into electrical energy; how fluctuations in electric current operate a photographic light valve which registers their fluctuations through a varying light beam upon a sensitized photographic film; and finally how the process is reversed in the reproducing process through the sound film projector. Variable area and variable density sound tracks are explained and demonstrated.

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Indiana University Library Moving Image Archive

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