Abstract

A technique for suppressing scratch noise from worn-out optical sound tracks utilizing a slit source of white light is presented. The theory of operation is analyzed and verified experimentally. Photographs of worn-out sound tracks before and after filtration demonstrate the effectiveness of this technique, showing the recovered sound tracks to be free of both scratch noise resulting from extensive use and coherent noise.

© 1985 Optical Society of America

Coherent-optic suppression of scratch noise on optical sound records

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