发明授权
US07075866B2 Clock extracting device of a disc reproducing apparatus having a gain command unit for designating a loop gain
失效
具有用于指定环路增益的增益指令单元的盘再现装置的时钟提取装置
- 专利标题: Clock extracting device of a disc reproducing apparatus having a gain command unit for designating a loop gain
- 专利标题(中): 具有用于指定环路增益的增益指令单元的盘再现装置的时钟提取装置
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申请号: US09986671申请日: 2001-11-09
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公开(公告)号: US07075866B2公开(公告)日: 2006-07-11
- 发明人: Masayoshi Nakamura , Emi Kitano
- 申请人: Masayoshi Nakamura , Emi Kitano
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Wenderoth, Lind & Ponack, L.L.P.
- 优先权: JPP2000-349346 20001116
- 主分类号: G11B5/09
- IPC分类号: G11B5/09 ; G11B7/005
摘要:
A clock extracting device of a disc reproducing apparatus includes an information read-out member for reading information signals from a disklike information recording medium; a voltage control oscillator; a phase comparator; a frequency comparator; a speed sensor for detecting the frequency of the output of the voltage control oscillator at a reference clock so as to output a speed signal; a gain command unit for designating a loop gain of a clock extracting circuit in accordance with the speed signal outputted from the speed sensor; a charge pump which discharges or draws electric current in accordance with outputs of the phase comparator and the frequency comparator and changes over an output current value in accordance with a gain command of the gain command unit; and a series circuit of a resistor and a capacitor, wherein the gain command unit issues the gain command such that the loop gain of the clock extracting circuit secures a desired operating point in accordance with a read rate of the information signals.
公开/授权文献
- US20020057633A1 Clock extracting device of disc reproducing apparatus 公开/授权日:2002-05-16