Apparatus for regenerating information from records made by opti

Details Apparatus for regenerating information from records made by opti Apparatus for regenerating information from records made by opti

1988-07-08

1990-09-11

Fears, Terrell W.

Static information storage and retrieval

Information masking

Transparency

365120, G11C 1304

Patent

active

049568132

ABSTRACT:
An apparatus for reproducing information from records made by an optical-wavelength-multiplexing method which includes a first medium acting as a data carrier which data can be recorded on and reproduced from by the optical-wavelength-multiplexing method and which further includes a second medium having the same characteristic as that of the first medium on which no records have been made, wherein components of light reflected or transmitted by the first and second mediums are then detected by a first and second photodetectors, respectively, and wherein the outputs of the first and second photodetectors are further processed so that a ground level of the "reproduced signal" is adjusted to substantially constant value.

REFERENCES:
patent: 3638201 (1972-01-01), Borner
patent: 4101976 (1978-07-01), Castro et al.
patent: 4139263 (1979-02-01), Lehureau et al.
patent: 4283777 (1981-08-01), Curry et al.
patent: 4428069 (1984-01-01), Hazel et al.
U.S. application Ser. No. 140,210.
U.S. application Ser. No. 167,109.
U.S. application Ser. No. 182,118.

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