| 摘要 |
PURPOSE:To improve the S/N of reproduction signals by providing a simple control circuit before a magnetic head and performing recording with the recording current value close to optimum current. CONSTITUTION:A recording signal is transmitted via an input terminal 1 and a modulating circuit 2 to a control circuit 9. The circuit 9 is for changing the output signal of the circuit 2 by the relative positions of a magnetic head 5 and a magnetic disc, and has pulse applying terminals A, B, C. Its output terminal is connected to the input terminal of a recording amlifier 3. The amplifier 3 performs amplifying necessary for flowing current to the head 5, and is connected to the head 5 via a recording-reproducing change-over circuit 4. With such constitution, the output value of the circuit 2 is changed every time when the head 5 comes to a prescribed track group and therefore, recording is made by the current close to the optimum recording current value in the relative positions of the head 5 and the magnetic disc; hence, the S/N of the reproduction signal is improved. |
