Patent ID: 8967475
Filing Date: 2015-03-03
Classification: G06K,G11B

Abstract:
1. A magnetic head device comprising: a magnetic head for reproducing configured to reproduce information recorded in a magnetic information recording medium; an amplifier section for amplifying configured to amplify a reproduced signal with a gain, the reproduced signal being reproduced by the magnetic head; an A/D converter section that carries out sampling at predetermined intervals with respect to the amplified reproduced signal for converting into a digital signal and outputs the digital signal; a signal comparator section for comparing configured to compare an output value of the digital signal with a predetermined output criterion value; and a gain control section for adjusting configured to adjust the gain in such a way so as to make the output value closer to the output criterion value in the a case where the output value is either smaller or greater than the output criterion value; wherein the rain control section adjusts the rain in such a way as to make the output value closer to the output criterion value, with a rate of 35 to 60% in proportion to the output difference between the output value and the output criterion value.