| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve an AMS function by fixing the equalizer characteristic of an equalizing circuit to a first equalizer characteristic irrespective of the on/off of a switch while controlling a transistor by a control circuit. SOLUTION: An equalizing circuit 12 is constituted in a feedback type by an operational amplifier 121. Moreover, the output end of the operational amplifier 121 is connected to a noise reducing circuit 13 through a resistor R14 and an terminal T14. Thus, the frequency characteristic of the equalizing circuit 12 becomes an equalizer characteristic for a normal tape when a switching circuit 122 is turned off and becomes an equalizer characteristic for a metallic tape when the switching circuit 122 is turned on.</p> |
