发明授权
- 专利标题: Method for estimating the quality of an information recording medium utilizing equalization signals
- 专利标题(中): 利用均衡信号估计信息记录介质的质量的方法
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申请号: US09808234申请日: 2001-03-15
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公开(公告)号: US06847600B2公开(公告)日: 2005-01-25
- 发明人: Yutaka Kashihara , Yutaka Okamoto , Chosaku Noda , Hideo Ando , Koichi Hirayama
- 申请人: Yutaka Kashihara , Yutaka Okamoto , Chosaku Noda , Hideo Ando , Koichi Hirayama
- 申请人地址: JP Kawasaki
- 专利权人: Kabushiki Kaisha Toshiba
- 当前专利权人: Kabushiki Kaisha Toshiba
- 当前专利权人地址: JP Kawasaki
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
- 优先权: JP2000-137179 20000510; JP2000-302668 20001002
- 主分类号: H04N17/06
- IPC分类号: H04N17/06 ; G11B7/005 ; G11B20/10 ; G11B20/18 ; G11B27/36 ; G11B5/09
摘要:
An estimation method produces a reproduction signal while reading from an information recording medium such as an optical disk, and uses an equalizer to produce an equalization signal. The method then synthesizes distribution levels of the equalization signal that range over distributions of (n+1) levels L0, L1, . . . , Ln (in which L0 2), thereby creating a new distribution. The method then uses the standard deviation of the new distribution as an estimation reference value to estimate the quality of an information reproduction apparatus or the quality of the information recording medium. The quality estimate may be used to adjust a circuit in an information reproduction apparatus that reads the information recording medium.