Repetitive controller having reduced memory elements

Details Repetitive controller having reduced memory elements Repetitive controller having reduced memory elements

2007-09-04

2007-09-04

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

10538628

ABSTRACT:
A repetitive controller for suppressing periodic signals with half-wave symmetry includes a memory loop fed with a periodic signal of period NT and in which the memory size includes N/2 memory elements. A negative feedback connection is provided and a factor of −½ is provided at the output of the memory loop. Such a repetitive controller may be used for instance in the disturbance compensation module of a drive servo system in a recording and reproducing apparatus including a head for recording data on a recording medium.

REFERENCES:
patent: 4569072 (1986-02-01), van Roermund
patent: 5404418 (1995-04-01), Nagano
patent: 5406126 (1995-04-01), Hadley et al.
patent: 5592346 (1997-01-01), Sullivan
patent: 5740090 (1998-04-01), Steinbuch et al.
patent: 6765848 (2004-07-01), Faucett

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