Document Type and Number:
Japanese Patent JPS5093550
Kind Code:
A
Abstract:
The process consists in splitting the information into N groups of M bits, in recording the groups on N parallel tracks on the carrier, in the form of M holograms differentiated from each other by the pitch of the interference fringes constituent of each hologram. To this end, either a laser of variable wavelength is used, or a reference beam of variable direction. The M holograms are superimposed. At the play-back stage, a fixed coherent light beam projected onto one hologram generates NM beams of different directions. N rows of M photodiodes detect the beams and supply read-out means.
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Application Number:
JP14551874A
Publication Date:
July 25, 1975
Filing Date:
December 18, 1974
Export Citation:
International Classes:
G11C15/00; G06F17/30; G11C13/04; (IPC1-7): G11C15/00; G06F15/40; G06F7/28