发明名称 |
Defect detector circuit with a signal synthesizer and magnet disk certifier using the same defect detector circuit |
摘要 |
A magnetic disk certifier includes a defect detector circuit comprising a low-pass filter for extracting a low frequency component of the read-out signal, the low frequency component containing a signal component of the error, a signal generator circuit for generating a signal having a predetermined frequency lower than the frequency of the read-out signal, a synthesizer circuit for synthesizing an output signal of the low-pass filter and the signal outputted from the signal generator circuit and a comparator for generating an error signal by comparing the synthesized signal from the synthesizer circuit with a predetermined reference level.
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申请公布号 |
US6552535(B2) |
申请公布日期 |
2003.04.22 |
申请号 |
US20010962089 |
申请日期 |
2001.09.26 |
申请人 |
HITACHI ELECTRONICS ENGINEERING CO., LTD. |
发明人 |
FUNAKI TOSHIHARU;HONMA SHINJI;SHITARA KENICHI;MOCHIDUKI HIDEKI |
分类号 |
G01R33/12;G11B5/00;G11B5/012;G11B20/18;G11B27/36;(IPC1-7):G01R33/12 |
主分类号 |
G01R33/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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