| 摘要 |
PURPOSE:To ensure the assured reproduction of a magnetic record with high fidelity for a thin film head, by eliminating the noise caused by the recording magnetization and transmitted before the detection based on the structure of a magnetic pole and at the same time equalizing the noise caused by the recording magnetization and given after the direction within a circuit. CONSTITUTION:For the recording magnification 102, a closed magnetic path 61-1 is formed at a ferrite magnetic pole 12 having a thickness larger than the wavelength of the radiated magnetic flux with no interlinkage given to a coil 21. Accordingly no noise voltage is aused to the coil 21. Then a magnetic head 201 detects the noise caused by the mgangetization 102 carried out after passing a head gap part, and the noise is supplied to a pulse forming circuit 401 after the amplification 301. For an intervenient equivalent circuit 500, plural delaying circuits are provided and the noise is superposed on the original signal after being multiplied by the subtraction coefficient and inverted through a hole number amplifier. Thus a noise part, i.e. a time delay component of a signal containing the noise is offset. |
