| 摘要 |
PURPOSE:To reduce the information reproducing error by recording bits '1' and '0' correspondingly to one magnetization inversion and two continuous magnetization inversions respectively and detecting a maximum inclination position of a reproduced signal as the inversion position when the inversion position of bit '1' is detected. CONSTITUTION:A medium recorded by a recording current (a) is reproduced by a head 1 to obtain a signal (b), and this signal is amplified by a preamplifier 2 and is inputted to a differentiation circuit 3 to obtain an output signal (c), and comparators 5 and 6 are used to clamp this signal at the positive polarity and the negative polarity by a clamp voltage Vc, and gate signals (d) and (e) for detection of the maximum inclination position are obtained. Said differentiated signal (c) is differentiated furthermore by a differentiation, circuit 4 to obtain a signal (f), and comparators 7 and 8 are driven by the twice differentiated signal (f) and gate signals (d) and (e) to generate pulse trains (g) and (h) which rise the zero-crossing position of the waveform (f), namely, the maximum inclination position of the waveform (b). Thereafter, they are added by an adder circuit 9 to obtain a recording data signal (i) inverted in positions corresponding to bits '1' by an FF 10.
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