发明名称 |
Optical crosstalk attenuation for an optical disk drive. |
摘要 |
<p>A method for attenuating optical crosstalk induced components of a focus error signal in an optical disk drive of the type having a grooved optical disk with servo tracks and tracking and focus servo systems controlled by a digital signal processor. A calibration operation is performed whenever a new disk is inserted into the track. During the calibration operation, the disk is scanned about a tracking axis at a track crossing frequency greater than the focus servo system bandwidth. The focus error signals produced when the disk is scanned are filtered about a pass band including the track crossing frequency. Crosstalk values equal to values of the filtered focus error signals are determined as a function of corresponding values of the tracking error signals, and are stored in memory. A correction operation is performed while reading and writing data on the disk. During the correction operation, the crosstalk values are read from memory as a function of corresponding values of the tracking error signals, and summed with the focus error signals. <IMAGE></p> |
申请公布号 |
EP0526113(A2) |
申请公布日期 |
1993.02.03 |
申请号 |
EP19920306764 |
申请日期 |
1992.07.23 |
申请人 |
HEWLETT-PACKARD COMPANY |
发明人 |
HOFER, GREGORY V.;MCDONALD, JAMES C. |
分类号 |
G11B7/00;G11B7/005;G11B7/09;G11B7/095 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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