发明名称 |
Circuit and method for searching track on CD |
摘要 |
A track search circuit includes a command decoder which decodes command data sent by a microcomputer and stored in a command register and outputs signals commanding a track jump and commanding count of a counter which counts a tracking error signal. Time difference between a present A-time and a target A-time is calculated such that an optical pick-up can be moved toward a target position by utilizing the track jump of 4n. When a counted value of the counter reaches a predetermined value, the A-time is renewed such that the time difference can be reduced by addition or subtraction suitable time data to or from the A-time. If the renewed A-time becomes within 1 minutes with respect to the target A-time in repeating such a track jump in accordance with the renewed A-time, the optical pick-up is stopped to move, and the A-time is read to jump the optical pick-up again to catch the target position.
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申请公布号 |
US5623460(A) |
申请公布日期 |
1997.04.22 |
申请号 |
US19950489249 |
申请日期 |
1995.06.13 |
申请人 |
SANYO ELECTRIC CO., LTD. |
发明人 |
NAGASAWA, NAOBUMI;ARAI, HIROYUKI |
分类号 |
G11B21/08;G11B7/085;G11B27/10;(IPC1-7):G11B17/22 |
主分类号 |
G11B21/08 |
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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