发明名称 |
A demodulation circuit and an optical disc apparatus |
摘要 |
A demodulation circuit of an optical disc apparatus performing an FSK demodulation by being provided with a binary signal which is obtained by binarizing a signal reproduced from an optical disc on which an FSK modulation signal is previously recorded, said demodulation circuit characterized by: edge interval measuring means for measuring an edge interval of said binary signal; subtracting means for obtaining an FSK modulation component from a difference between a measured edge interval value and a previously determined edge interval reference value; first moving average means for obtaining a moving average of said FSK modulation component; demodulation value calculating means for obtaining a demodulation value based on an average value output from said first moving average means; second moving average means for obtaining a moving average of said demodulation value; and comparing means for comparing an average value output from said second moving average means with a reference value so as to obtain a binary FSK demodulation signal. <IMAGE> |
申请公布号 |
EP1610328(A1) |
申请公布日期 |
2005.12.28 |
申请号 |
EP20050020395 |
申请日期 |
1998.05.28 |
申请人 |
MITSUMI ELECTRIC CO., LTD. |
发明人 |
OKADA, ISAO;HIRABUKI, TSUYOSHI |
分类号 |
G11B20/10;G11B20/14;G11B20/18;G11B27/19;G11B27/24;G11B27/30;H03M5/12 |
主分类号 |
G11B20/10 |
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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