发明授权
US5134607A Optical memory system for generating a timing control signal for
detecting a recorded region through a playback signal
失效
光存储系统,用于产生用于通过重放信号检测记录区域的定时控制信号
- 专利标题: Optical memory system for generating a timing control signal for detecting a recorded region through a playback signal
- 专利标题(中): 光存储系统,用于产生用于通过重放信号检测记录区域的定时控制信号
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申请号: US564799申请日: 1990-08-09
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公开(公告)号: US5134607A公开(公告)日: 1992-07-28
- 发明人: Hiroshi Fuji , Shigemi Maeda , Noriaki Sakamoto , Shigeo Terashima , Takeshi Yamaguchi , Kentaro Tsuji , Kunio Kojima
- 申请人: Hiroshi Fuji , Shigemi Maeda , Noriaki Sakamoto , Shigeo Terashima , Takeshi Yamaguchi , Kentaro Tsuji , Kunio Kojima
- 申请人地址: JPX Osaka
- 专利权人: Sharp Kabushiki Kaisha
- 当前专利权人: Sharp Kabushiki Kaisha
- 当前专利权人地址: JPX Osaka
- 优先权: JPX61-26636 19860207; JPX61-45761 19860228; JPX61-73298 19860328
- 主分类号: G11B7/004
- IPC分类号: G11B7/004 ; G11B11/105 ; G11B27/30
摘要:
An optical memory device for recording, reproducing, or erasing information applies an optical beam such as a laser beam onto a recording medium. The optical memory device includes a recorded region detecting circuit for detecting information recorded region formed in the recording medium. In the optical memory device, a timing control for recording, reproducing, or erasing is performed with the use of a result obtained through detection of a synchronizing signal, such as a sector mark, indicative of a starting point of an information block and another result obtained through detection in the recorded region detecting circuit. The recorded region detecting circuit includes either at least one peak hold circuit for detecting a peak level of the playback signal or a low pass filter for smoothing the playback signal, and a comparator for comparing an output obtained through the peak hold circuit or through the low pass filter with a reference voltage.
公开/授权文献
- US5668858A Control device for a facsimile apparatus 公开/授权日:1997-09-16