发明名称 |
Methods, Systems, And Computer Program Products For Correcting Repeatable Runout |
摘要 |
Methods and systems are described for correcting repeatable runout. In one aspect, an open loop tracking signal is received and squared. A discrete Fourier transform (DFT) of the squared open loop tracking signal is obtained. A velocity magnitude and an absolute value of the phase of the open loop tracking signal is determined. A RRO correction signal is iteratively constructed by performing a partial correction based on an initial phase selected and an initial velocity amplitude, measuring a relative velocity amplitude, performing a partial control correction using the initial phase and relative velocity amplitude if the amplitude is smaller than an initial amplitude; performing a partial control correction using the initial phase and the relative velocity amplitude if the amplitude is smaller than an initial amplitude, and repeating the above steps until a tracking controller can perform closed loop control of the track to optical pickup unit velocity.
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申请公布号 |
US2012320720(A1) |
申请公布日期 |
2012.12.20 |
申请号 |
US201213528760 |
申请日期 |
2012.06.20 |
申请人 |
HANSEN FRED R.;WATT CHARLES R. |
发明人 |
HANSEN FRED R.;WATT CHARLES R. |
分类号 |
G11B7/095 |
主分类号 |
G11B7/095 |
代理机构 |
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代理人 |
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地址 |
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