发明授权
- 专利标题: Method for testing or recording servo signal on perpendicular magnetic recording media
-
申请号: US11054383申请日: 2005-02-10
-
公开(公告)号: US07026810B2公开(公告)日: 2006-04-11
- 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: G01B7/00
- IPC分类号: 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.