Pulsed optical data detection system

Details Pulsed optical data detection system Pulsed optical data detection system

1984-11-16

1987-08-18

McElheny, Jr., Donald

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

360 46, 369124, G11B 700

Patent

active

046882049

ABSTRACT:
Disclosed is a data detection system and method for accurately detecting data transition marks recorded on a recording surface. A data transition pulse, generated by a data head as recorded data transition marks pass thereby, is presented to consecutive delay circuits in order to generate first and second delay pulses. The second delay pulse and the data transition pulse are subtracted from the first delay pulse, thereby creating a narrow output pulse that indicates the occurrence of a data transition. This narrow output pulse is used to toggle a flip-flop or equivalent logic circuit, the flip-flop output thereby representing a recreation of the data as recorded on the recording surface. The system is best suited for use with an optical storage system wherein data transitions are recorded on an optical disk as spots of substantially uniform size, although the detection system does not require that the spots be uniform size.

REFERENCES:
patent: 4385328 (1983-05-01), Tanaka
patent: 4467462 (1984-08-01), Shibata
patent: 4541083 (1985-09-01), Maeda et al.
patent: 4563760 (1986-01-01), Maeda et al.
patent: 4564929 (1986-01-01), Yonezawa et al.

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