Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-04-02
2008-10-07
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07433148
ABSTRACT:
Embodiments of the present invention significantly reduce the number and complexity of processing operations to be performed. This is done by receiving the learned run out or vector A to be rotated by phase q. This phase q may be limited to a π/4 resolution. Sine function values and cosine function values based on q are selected from a group of values comprising −1, 0, and +1. The sine function values and cosine function values selected may then be applied to the learned run out or vector A to rotate the vector A by phase q. Because the sine and cosine values are limited to −1, 0 and +1 many multiplication processing operations are eliminated. This greatly simplifies the processing requirements associated with phase rotating of this learned run out.
REFERENCES:
patent: 6847502 (2005-01-01), Codilian
patent: 6992853 (2006-01-01), Chang
patent: 7088547 (2006-08-01), Wang et al.
patent: 7265933 (2007-09-01), Phan et al.
patent: 7333410 (2008-02-01), Serrano
patent: 2007/0133364 (2007-06-01), Serrano et al.
patent: 2008/0112073 (2008-05-01), Shelton
Broadcom Corporation
Garlick & Harrison & Markison
McLauchian, III Robert A.
Tzeng Fred
LandOfFree
Hard disk drive repeatable runout feed forward cancellation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hard disk drive repeatable runout feed forward cancellation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hard disk drive repeatable runout feed forward cancellation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4008310