Rotational recording apparatus and control method
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United States of America Patent
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Nov 14, 2006
Issued Date -
N/A
app pub date -
Sep 12, 2002
filing date -
Sep 21, 2001
priority date (Note) -
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Abstract
A technique for adaptively and stably updating the feed forward value required to drive the head of a rotational recording apparatus. A trajectory of a target position is generated for each seek command by using a compound function comprising a ramp function and a sine-wave function. The sine-wave element of the target position is transmitted to an adaptive filter for updating coefficients of the compound formula. All elements other than the sine-wave element are removed to provide a smooth update of the compound function's coefficients.
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