发明授权
- 专利标题： Method for testing or recording servo signal on perpendicular magnetic recording media
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申请号： US10082159申请日： 2002-02-26
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公开(公告)号： US06894488B2公开(公告)日： 2005-05-17
- 发明人: Atsushi Kikugawa , Kiwamu Tanahashi , Yukio Honda , Masaaki Futamoto , Yoshiyuki Hirayama
- 申请人： Atsushi Kikugawa , Kiwamu Tanahashi , Yukio Honda , Masaaki Futamoto , Yoshiyuki Hirayama
- 申请人地址： JP Tokyo
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Mattingly, Stanger, Malur & Brundidge, P.C.
- 优先权： JP2001-285676 20010919
- 主分类号： G11B5/00
- IPC分类号： G11B5/00 ; G11B5/012 ; G11B5/02 ; G11B5/73 ; G11B5/84 ; G11B20/10 ; G11B20/24 ; G11B27/36 ; G01B7/00
摘要：
An object is to automatically detect the positions of spike noise, create a distribution diagram, and perform pass/fail decisions. The cross-correlation function of the signal waveform from a magnetic head 1 and a reference waveform simulating spike noise is used in extraction of spike noise. The number of peaks in the cross-correlation function exceeding a threshold value is counted, and quantitative evaluation of spike noise is performed.
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