发明名称 |
TRACKING ERROR DETECTION DEVICE |
摘要 |
A tracking error detection device (1) which, as shown in Fig. 1, converts photocurrent received by a photodetector (2) into voltage signals in current/voltage changers (7a-d), and adds voltage signals in adders (8a, b) to create two signal sequences. The two signal sequences are digitized respectively in ADCs (16a, b) and interpolation-processed in interpolation filters (17a, b), and have zero-cross points detected in zero-cross point detection circuits (18a, b). Phase difference between zero-cross points of the two signal sequences is detected by a phase difference detection circuit (19), and the phase difference is subjected to band-limiting by LPF (11) to thereby obtain a tracking error signal. The above arrangement can provide a small, low-cost tracking error detection device that can accommodate the double-speed of an optical recording/reproducing device and the higher-density of an optical recording medium.
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申请公布号 |
WO0116948(A1) |
申请公布日期 |
2001.03.08 |
申请号 |
WO2000JP05805 |
申请日期 |
2000.08.29 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;HIRATUKA, TAKASIGE;MARUKAWA, SHOJI;OKAMOTO, TOSHINORI |
发明人 |
HIRATUKA, TAKASIGE;MARUKAWA, SHOJI;OKAMOTO, TOSHINORI |
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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