发明申请
- 专利标题： Apparatus and method for detecting land prepit
- 专利标题（中）： 用于检测土地预制坑的装置和方法
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申请号： US10912539申请日： 2004-08-06
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公开(公告)号： US20050041563A1公开(公告)日： 2005-02-24
- 发明人: Yuji Tawaragi , Eisaku Kawano , Yoshitaka Shimoda , Shinji Suzuki , Akira Shimizu
- 申请人： Yuji Tawaragi , Eisaku Kawano , Yoshitaka Shimoda , Shinji Suzuki , Akira Shimizu
- 专利权人： PIONEER CORPORATION
- 当前专利权人： PIONEER CORPORATION
- 优先权： JPP2003-206978 20030808
- 主分类号： G11B20/10
- IPC分类号： G11B20/10 ; G11B5/09 ; G11B7/00 ; G11B7/005 ; G11B7/007 ; G11B7/09
摘要：
A filter generates a received-light signal LAD2 from which impulse components TR included in a received-light LAD1 have been removed. A filter generates a received-light signal LBC2 from which impulse components TR included in a received-light LBC1 have been removed. A subtracter subtracts a received-light signal WBC from a received-light signal WAD, thereby generating a radial push-pull signal WPP. A comparator compares the radial push-pull signal WPP from which the impulse components have been removed with a reference level VT, thereby detecting a land prepit.
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