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G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
FR714448D1930-12-151931-02-28Film sonore et procédé d'enregistrement des sons et des vibrations sonores d'après le procédé à l'intensité
ExpiredFR714448A
(fr)
Procédé de fabrication de films sonores d'après le procédé d'enregistrement des amplitudes avec enregistrement séparé des amplitudes et des fréquences