发明名称 |
Digital recorded data reproducing device |
摘要 |
In a digital recorded data reproduction which applies PRML signal processing, it is an object to enhance a reproduction signal quality and a playability for an abnormal signal by an offset correction and a phase-interpolation-type digital phase-locked loop. A prescribed frequency band of a reproduction signal is emphasized by a waveform equalizing unit 2, and its output signal is sampled by an asynchronous clock at an analog/digital converter 3. After a sampling signal is subjected to the offset correction, PR equalization is performed by a transversal filter 6 and a tap weighting factor control unit 8 which applies LMS algorithm, and a signal of a regular sampling phase is reproduced from its output signal by a high-order interpolation filter 7 employing a digital phase-locked loop 11. The reproduced signal in a regular phase is demodulated by a maximum likelihood decoder 12, thereby to reproduce digital data recorded on a medium.
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申请公布号 |
US6674707(B2) |
申请公布日期 |
2004.01.06 |
申请号 |
US20010936513 |
申请日期 |
2001.11.13 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
OGURA YOUICHI;URITA KOICHI;SATO SHINICHIRO;ODA YOSHIMASA |
分类号 |
G11B7/00;G11B7/09;G11B7/095;G11B20/10;G11B20/14;G11B20/18;H03M13/39;(IPC1-7):G11B7/00 |
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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