发明名称 |
Method for processing the output signals of an optoelectronic scanner in a replay or recording appliance, and a corresponding appliance |
摘要 |
<p>A method is specified for processing the output signals A to F of an optoelectronic scanner (3) in a replay or recording appliance for replaying from or recording onto an optical recording medium having the following method steps: as well as an appliance with a corresponding input circuit of a digital servo controller: first of all, the output signals A to F are supplied directly to an A/D converter (2) without the interposition of a low-pass filter, and are digitized with n-times oversampling. The digitized output signals are then supplied to a k-th order comb filter (4) by means of which undersampling of the signals to the normal sampling frequency (44.1 kHz) is carried out. After this, the undersampled output signals A' to F' of the comb filter (4) are supplied to a trimming and correction circuit (6) in which trimming and correction, of OFFSET and BALANCE are respectively carried out. Finally, the trimmed/corrected output signals A'' to F'' are supplied to the trimming and correction circuit of a digital servo circuit (1), by means of which a focusing error signal (FE) and a track deviation error signal (TE) are produced. <IMAGE></p> |
申请公布号 |
EP0831467(A2) |
申请公布日期 |
1998.03.25 |
申请号 |
EP19970115760 |
申请日期 |
1997.09.10 |
申请人 |
DEUTSCHE THOMSON-BRANDT GMBH |
发明人 |
TAKAGI, HIROHITO;SCHEMMANN, HEINRICH |
分类号 |
G11B7/09;(IPC1-7):G11B7/09 |
主分类号 |
G11B7/09 |
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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