发明名称 |
Apparatus for reproducing recorded information with error detection and correction processing |
摘要 |
An apparatus for reproducing recorded information reads information from the track surface of a CD-ROM disk 1, performs error detection and correction processing on the read information to reproduce recorded information and then outputs the reproduced information. This apparatus includes a control device 11, which switches a reproduction operation to the standard speed mode in response to a correction failure condition generated in the quadruple speed mode and retries standard-speed reading of the information read with an error uncorrectable in the quadruple speed mode. Reducing the signal read speed to one-fourth in the retry processing at the standard speed improves the C/N ratio of the high-frequency signal RF by 6 dB, which in turn improves the correction capability for random errors.
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申请公布号 |
US5612933(A) |
申请公布日期 |
1997.03.18 |
申请号 |
US19950464121 |
申请日期 |
1995.06.05 |
申请人 |
HITACHI, LTD.;HITACHI MICROCOMPUTER SYSTEM LTD. |
发明人 |
ISO, YOSHIMI;WATANABE, TOSHIHIKO;HARA, KAZUYA;ROKUSAKA, AKIHIKO;SATO, HIDEAKI |
分类号 |
G11B20/24;G11B7/0037;G11B7/085;G11B7/09;G11B19/12;G11B19/26;G11B19/28;G11B20/12;G11B20/18;(IPC1-7):G11B7/00 |
主分类号 |
G11B20/24 |
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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