| 摘要 |
<p>The present application provides a magnetic head device that can suppress output fluctuation even though the output changes in part of an output waveform from the magnetic head. Concretely to describe, the magnetic head device includes a magnetic head 1 for reproducing information recorded in a magnetic information recording medium; an amplifier section 2 for amplifying a reproduced signal that the magnetic head 1 has reproduced, by using a gain; an A/D converter section 3 for converting the reproduced signal that has been amplified, to a digital signal, by way of sampling the signal at predetermined intervals, in order to output the converted digital signal; a signal comparator section 4a for comparing a digital signal output value with a predetermined output criterion value; and a gain control section 4b for adjusting the gain in such a way as to make the output value closer to the output criterion value, in the case where the output value is either greater or smaller than the output criterion value.</p> |
