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    • 10. 发明专利
    • ELECTROMAGNETIC CONVERSION CHARACTERISTIC MEASURING SYSTEM
    • JPS6473269A
    • 1989-03-17
    • JP23029787
    • 1987-09-14
    • HITACHI LTD
    • YAMADA FUJIOKANEKO KENJIKATO HIDEHARU
    • G01R33/12
    • PURPOSE:To enable simultaneous judgment of a level difference, a waveform distortion and a phase deviation, by generating a reference waveform from a reading signal for magnetization inverting information to compare a reading waveform with the reference waveform in the area being divided before and after a peak point. CONSTITUTION:A fundamental pattern written into a magnetic disc 1 is brought into a reading signal buffer 12, which is connected to an area divider 15 for a waveform to be measured to compare an area thereof with that of a reference waveform and areas of the waveforms before and after a peak point are inputted by two frequency portions. A servo signal on the disc 1 is taken into a servo head 2 to generate a clock with a digitization reference clock generator 8. The clock is inputted into a clock generator 13 for analysis to generate the reference waveform. The reference waveform is inputted into a reference waveform assumed integration divider 14 to store areas thereof before and after the peak. Then, these areas are compared continuously by two electromagnetic conversion characteristic comparators 16 to perform a waveform analysis.