-
公开(公告)号:US20050174275A1
公开(公告)日:2005-08-11
申请号:US10514596
申请日:2003-05-16
CPC分类号: G11B7/0948
摘要: An optical disk drive (50) comprises a radial servo system (70) for driving the position of an optical head (52) for scanning an optical disk (10) comprising at least one recording track (11; 12, 13), a focus servo system (80) for controlling the focussing of an optical beam, and a data retrieval system (90) for regenerating the digital data recorded on disk. Operative parameters of the radial servo system (70) and/or focus servo system (80) and/or data retrieval system (90) are frozen or are set to predetermined values as soon as the optical head (52) reaches a predetermined location (17) along a current track (12; 13) which is determined on the basis of a defect entry location (17) along a previous track (11; 12).
摘要翻译: 光盘驱动器(50)包括用于驱动用于扫描包括至少一个记录轨道(11; 12,13)的光盘(10)的光学头(52)的位置的径向伺服系统(70) 用于控制光束聚焦的伺服系统(80),以及用于再生记录在盘上的数字数据的数据检索系统(90)。 一旦光学头(52)到达预定位置,则径向伺服系统(70)和/或聚焦伺服系统(80)和/或数据检索系统(90)的操作参数被冻结或被设置为预定值 沿着沿着先前轨道(11; 12)的缺陷入口位置(17)确定的当前轨道(12; 13)沿着当前轨道(12; 13)。
-
公开(公告)号:US20050232096A1
公开(公告)日:2005-10-20
申请号:US10524569
申请日:2003-07-11
CPC分类号: G11B20/10009 , G11B7/0948 , G11B21/106
摘要: An apparatus for scanning a track on a record carrier has a head (22) and front end circuitry (31) for scanning the track and generating scanning signals. A detection unit (32) detects anomalies in the scanning signal, for example for adjusting a tracking servo. The detection unit (32) calculates a mean value of the scanning signal and compares the mean value to a threshold for providing an anomaly detection signal (33). Further a classification unit (34) provides an indication of the type of defect for determining a suitable responsive or corrective action.
摘要翻译: 用于扫描记录载体上的轨道的装置具有用于扫描轨道并产生扫描信号的头部(22)和前端电路(31)。 检测单元(32)检测扫描信号中的异常,例如用于调整跟踪伺服。 检测单元(32)计算扫描信号的平均值,并将平均值与用于提供异常检测信号的阈值进行比较(33)。 此外,分类单元(34)提供用于确定适当的响应或纠正动作的缺陷类型的指示。
-
公开(公告)号:US07212474B2
公开(公告)日:2007-05-01
申请号:US10524569
申请日:2003-07-11
IPC分类号: G11B7/00
CPC分类号: G11B20/10009 , G11B7/0948 , G11B21/106
摘要: An apparatus for scanning a track on a record carrier has a head (22) and front end circuitry (31) for scanning the track and generating scanning signals. A detection unit (32) detects anomalies in the scanning signal, for example for adjusting a tracking servo. The detection unit (32) calculates a mean value of the scanning signal and compares the mean value to a threshold for providing an anomaly detection signal (33). Further a classification unit (34) provides an indication of the type of defect for determining a suitable responsive or corrective action.
摘要翻译: 用于扫描记录载体上的轨道的装置具有用于扫描轨道并产生扫描信号的头部(22)和前端电路(31)。 检测单元(32)检测扫描信号中的异常,例如用于调整跟踪伺服。 检测单元(32)计算扫描信号的平均值,并将平均值与用于提供异常检测信号的阈值进行比较(33)。 此外,分类单元(34)提供用于确定适当的响应或纠正动作的缺陷类型的指示。
-
-