Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2005-03-22
2005-03-22
Tran, Sinh (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S068000, C327S108000, C327S110000
Reexamination Certificate
active
06870697
ABSTRACT:
Devices and methods for generating a magnetic head-specific overshoot current which is combined with an alternating current waveform into a write current used by the magnetic head to store information on a magnetic medium. A processor analyzes the frequency of incoming write data and retrieves from a data table of an overshoot current amplitude and an overshoot current phase. This amplitude and phase information is sent to an overshoot current generator to generate an overshoot current that is responsive to the dynamic impedance properties of a magnetic write head during operation. The data table may have information related to one or many write heads, and the data table may be further subdivided based on additional dynamic characteristics of a write head that may affect the impedance thereof.
REFERENCES:
patent: 6184727 (2001-02-01), Price, Jr.
patent: 20030223143 (2003-12-01), Fujiwara et al.
patent: WO0129829 (2001-04-01), None
Ikekame Hiroshi
Yamashita Takeo
A. Marquez, Esq. Juan Carlos
Davidson Dan I
Fisher Esq. Stanley P.
Reed Smith LLP
Tran Sinh
LandOfFree
Overshoot current phase/amplitude control for hard disk... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Overshoot current phase/amplitude control for hard disk..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Overshoot current phase/amplitude control for hard disk... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3435403