| 摘要 |
<p>In a head positioning control system of a magnetic disk device or other device, a frequency, in which the disturbance vibration of a specific vibration component, the amplitude of which changes depending on the head position, is present, is selected as a target frequency. Next, a resonant filter having a variable gain circuit (A) at its input end and a variable gain circuit (B) at its output end is designed, the variable gain circuit (A) having a resonant characteristic at the target frequency and a gain changing depending on the head position, the variable gain circuit (B) having inverse characteristics of the variable gain circuit (A). An input to the resonant filter is then set to zero during a seek operation, and after the seek operation, an error signal is input through the variable gain circuit (A) to the resonant filter. The gain product of the variable gain circuits (A, B) is controlled so as to become 1.</p> |
