Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Reexamination Certificate
2006-01-17
2006-01-17
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
Reexamination Certificate
active
06987633
ABSTRACT:
A method and apparatus to read calibration information from a calibration region encoded in a tape information storage medium while acquiring a plurality of valid calibration signals. The method provides (N) read/detect channels. The method establishes a valid calibration signal threshold, and detects at a first time the (i)th valid calibration signal. The method further determines at the first time the frequency and phase of that (i)th valid calibration signal using a first PLL component disposed in the (i)th read/detect channel. The method determines if the valid calibration signal threshold is exceeded. If the valid calibration signal threshold is exceeded, the method then provides the frequency and phase to a second PLL component, and reads information encoded on the tape medium using that second PLL component.
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Hudspeth David
International Business Machines - Corporation
Regelman Dale F.
Rodriguez Glenda P.
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