Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-04-10
2007-04-10
Nguyen, Hoa T. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
11143392
ABSTRACT:
Embodiments of the invention eliminate noise from burst signals by use of a reliable and simple method. In one embodiment, the read processor of the HDD has a noise elimination circuit. The noise elimination circuit retains multiple integral values of the waveform absolute values for each period in the burst signals read out from the head, then removes a maximum value and/or a minimum value from the multiple integral values, and transmits the remainder as noise-eliminated signal data. The noise elimination circuit is a circuit for eliminating noise from an N number of periods of burst signal data, and this circuit integrates the absolute values of the waveforms for each period in the N number of periods of burst signal data, compares the integral values of each period with one another, and outputs the remainder obtained by removing the maximum and minimum integral values, to the servo data decoder of the following stage.
REFERENCES:
patent: 6104559 (2000-08-01), Sakai
patent: 6388596 (2002-05-01), Sandusky
patent: 07-141807 (1995-06-01), None
patent: 08-203226 (1996-08-01), None
patent: 11-185203 (1999-07-01), None
Hitachi Global Storage Technologies - Netherlands B.V.
Nguyen Hoa T.
Slavitt Mitchell
Townsend and Townsend / and Crew LLP
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