Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1993-08-16
1995-08-01
Sugarman, Scott J.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369120, 369100, G11B 708
Patent
active
054385636
ABSTRACT:
An optical information recording/reproducing device is constituted of a focus control circuit connected to a controller, a tracking control circuit, a data processing circuit, and a card feed control circuit. The data processing circuit includes a plurality of I/V converters for converting signals received by a plurality of signal reproducing light receiving elements arranged to an optical detector into current/voltage, and a plurality of binary circuits each for converting the output from the I/V converters into a binary signal in a reference level. The data processing circuit includes a selector for selecting at least two outputs of a plurality of binary circuits. The data processing circuit includes a plurality of bit-clock producing circuits and a plurality of demodulation circuits. The bit-clock producing circuits produce bit clocks based on binary signals originated from selectors and a plurality of binary circuits which are not connected to the selectors. The demodulation circuits executes sampling the two binary signals in accordance with bit clocks and executes data demodulation using the sampled results. The data processing circuit includes a plurality of memories storing demodulated results from the plurality of demodulation circuits.
REFERENCES:
patent: 4730293 (1988-03-01), Pierce et al.
patent: 5177724 (1993-01-01), Gelbart
patent: 5267226 (1993-11-01), Matsuoka et al.
patent: 5293365 (1994-03-01), Rokutan
patent: 5315575 (1994-05-01), Akatsuka
Oshiba Mitsuo
Rokutan Takao
Sakurada Takefumi
Sugaya Takumi
Tani Naoaki
Chu Kim-Kwok
Olympus Optical Co,. Ltd.
Sugarman Scott J.
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