Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1981-07-31
1983-11-22
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
G11B 509
Patent
active
044172869
ABSTRACT:
A data recovery system for use in recovering data encoded in a double frequency code on a magnetic disc device includes a data window expander circuit. The data recovery system recovers both separated data and separated clock signals. The separated data signal has a data window which occurs during the second half of each bit cycle of the separated data signal. The data window expander circuit expands the data window, and includes flip-flops for delaying the separated data signal and an OR gate for logically ORing the delayed separated data signal with the undelayed separated data signal. The output of the OR gate is the separated data signal having an expanded data window, which can then be synchronized, with minimal alignment errors, by the separated clock signal.
REFERENCES:
patent: 3382492 (1968-05-01), Santzna
patent: 3636536 (1972-01-01), Norris
Canney Vincent P.
Cavender J. T.
Dugas Edward
Jewett Stephen F.
NCR Corporation
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