Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2008-06-19
2009-11-24
Nguyen, Hoa T (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07623318
ABSTRACT:
Noise in a same-gap, frequency-based servo tape system is reduced by applying correlated noise factors, generated during calibration, to filtered data write signals. The resulting noise values are subtracted from filtered servo signals, at frequencies F1and F2, to generate first and second noise-compensated servo signals at frequencies F1and F2. In one embodiment, the F1and F2data signals are filtered through two SOBP filters which output the magnitudes of the signals. The F1and F2servo signals are similarly filtered. In another embodiment, the F1and F2data signals are filtered through two Goertzel filters which output the real and imaginary components of the signals and the F1and F2servo signals are similarly filtered through two other Goertzel filters. Correlated noise factors are applied to the outputs of the write data Goertzel filters and the results subtracted from the corresponding outputs of the servo Goertzel filters.
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Chliwnyj Alex
Swanson David L.
Wills Steven C.
Habermehl James L
International Business Machines - Corporation
Nguyen Hoa T
Shifrin Dan
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