发明授权
US07190652B2 Pulse shape modulation and information recording and reproducing technique using pulsed laser beam
失效
使用脉冲激光束的脉冲形状调制和信息记录和再现技术
- 专利标题： Pulse shape modulation and information recording and reproducing technique using pulsed laser beam
- 专利标题（中）： 使用脉冲激光束的脉冲形状调制和信息记录和再现技术
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申请号： US10739089申请日： 2003-12-19
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公开(公告)号： US07190652B2公开(公告)日： 2007-03-13
- 发明人: Ippei Ogawa
- 申请人： Ippei Ogawa
- 申请人地址： JP Tokyo
- 专利权人： Ricoh Company, Ltd.
- 当前专利权人： Ricoh Company, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Dickstein Shapiro LLP
- 优先权： JP2002-375779 20021226
- 主分类号： G11B7/005
- IPC分类号： G11B7/005
摘要：
In the disclosed pulse shape modulation method, an amplitude modulation gain for a reproduced signal from an information recording medium that makes the jitter of the reproduced signal become the minimum is specified. Then, it is determined whether the amplitude modulation gain corresponding to the minimum jitter resides within a prescribed range. If the amplitude modulation gain corresponding to the minimum jitter is outside the prescribed range, the pulse shape of the pulsed laser beam is modulated.