发明授权
US5448543A Apparatus for reproducing data from a regenerative signal using a PLH
circuit having loop gain control
失效
使用具有环路增益控制的PLH电路从再生信号再现数据的装置
- 专利标题： Apparatus for reproducing data from a regenerative signal using a PLH circuit having loop gain control
- 专利标题（中）： 使用具有环路增益控制的PLH电路从再生信号再现数据的装置
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申请号： US937278申请日： 1992-08-31
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公开(公告)号： US5448543A公开(公告)日： 1995-09-05
- 发明人: Takuya Mizokami , Noritaka Narita , Akira Takagishi , Masahiro Takasago , Toru Kawashima , Masanori Matsuzaki , Toshiharu Kon
- 申请人： Takuya Mizokami , Noritaka Narita , Akira Takagishi , Masahiro Takasago , Toru Kawashima , Masanori Matsuzaki , Toshiharu Kon
- 申请人地址： JPX Tokyo
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX3-223145 19910903
- 主分类号： G11B7/005
- IPC分类号： G11B7/005 ; G11B11/105 ; G11B20/14 ; G11B20/18 ; G11B7/00
摘要：
A PLL circuit produces a synchronous signal by utilizing a regenerative clock signal in a VFO portion in a regenerative signal which was read out from a recording medium in sections. When a defective portion is present in a regenerative clock signal, the same sector is read out again from the recording medium to obtain the regenerative signal. A loop gain of the PLL circuit is made to be low in the defective portion of the regenerative signal which was read out again, thereby to prevent the synchronous fault of the PLL circuit due to the defective portion.
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