Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2004-12-15
2008-10-14
Klimowicz, William J. (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
Reexamination Certificate
active
07436609
ABSTRACT:
An apparatus, system, and method are disclosed for controlling gain in a magnetic media read channel. In one embodiment, a sampling module provides an asynchronous digital stream corresponding to encoded signals on a streaming magnetic medium, a stream synchronization module converts the asynchronous digital stream to a synchronous digital stream, and a gain control module processes the asynchronous digital stream and provides a gain control signal concurrent to synchronization of the asynchronous digital stream. The described apparatus, method, and system enables calibration of a read channel using a calibration signal (such as a VFO waveform) of shorter duration than attainable with currently available calibration means and methods.
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Davidson Dan I
International Business Machines - Corporation
Klimowicz William J.
Kunzler & McKenzie
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