Optical Reproduction of Sounds from Negative Phonograph Cylinders
The laser-beam reflection method that has been developed for the reproduction of phonograph wax cylinders was applied to metallic negative cylinders called galvanos, for which the traditional phonograph cannot be used. To this end, a compact optical head consisting of a laser diode, a position sensitive device, and illumination and detection optics was developed together with drive and control units. Some valuable sounds were reproduced successfully by this system.
KeywordsTracking Error Cylinder Surface Tection Optic Optical Reproduction Optical Head
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