发明名称 |
Wave-shaping apparatus and reproduction signal processing apparatus including the same |
摘要 |
A wave-shaping apparatus includes a first detection circuit for detecting a reproduction signal reproduced from an optical disk by an optical pickup circuit using a first detection time constant to detect an upper envelope of the reproduction signal; a second detection circuit for detecting the reproduction signal using a second detection time constant to detect a lower envelope of the reproduction signal; an averaging circuit for putting a weight represented by a weighting coefficient to each of the upper envelope and the lower envelope to calculate an average value of each of the upper envelope and the lower envelope; and a subtraction circuit for subtracting a signal corresponding to the average value from the reproduction signal to output a wave-shaped signal.
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申请公布号 |
US6798725(B1) |
申请公布日期 |
2004.09.28 |
申请号 |
US19990427287 |
申请日期 |
1999.10.26 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
HORIBE RYUSUKE;KAWAKAMI SHINICHI;AOKI KAZUHIRO;KANEKAMI YOUICHI |
分类号 |
G11B20/10;(IPC1-7):G11B5/09 |
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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