Disc phonograph record playback by laser generated diffraction p

Details Disc phonograph record playback by laser generated diffraction p Disc phonograph record playback by laser generated diffraction p

1978-11-13

1981-08-25

Wolff, John H.

Dynamic information storage or retrieval

Optical reading of mechanical record

369 44, 369112, 369121, H04N 576, G11B 700

Patent

active

RE0307238

ABSTRACT:
A laser beam is directed at the groove of a conventional disc phonograph record as it rotates, creating a reflected interference/diffraction pattern of the groove walls. The magnitude and rate of displacement of the interference/diffraction pattern is sensed and converted into an audio reproduction signal of the original phonograph recording.

REFERENCES:
patent: 1917003 (1933-01-01), Williams
patent: 1944202 (1934-01-01), Williams
patent: 3287563 (1966-11-01), Clunis
patent: 3452162 (1969-06-01), Dahlen
patent: 3848096 (1974-11-01), Marko
patent: 3860766 (1975-01-01), Mori
patent: 4034403 (1977-07-01), Compaan

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