Applying an adaptive feed-forward algorithm as a frequency selec

Details Applying an adaptive feed-forward algorithm as a frequency selec Applying an adaptive feed-forward algorithm as a frequency selec

1993-10-22

1996-08-27

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, G11B 5596

Patent

active

055506852

ABSTRACT:
A method for applying an adaptive feed-forward waveform correction to a primary servo loop compensation signal in a rotating data storage apparatus. A position error signal is used to determine a fixed feed-forward correction upon initialization or other predetermined conditions. An adaptive feed-forward waveform correction is periodically determined by adding a scaled version of the position error signal to the stored adaptive feed-forward value, and then processing the resulting sum through a frequency selective filter. The stored adaptive feed-forward correction is then updated with this new result. Simultaneously, the updated adaptive feed-forward correction is combined with the fixed feed-forward correction and the position error signal to generate a primary servo loop compensation signal for controlling the read/write head of the data storage apparatus.

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patent: 5204793 (1993-04-01), Plonczak
patent: 5233487 (1993-08-01), Christensen et al.

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