发明授权
- 专利标题: Data detection apparatus
- 专利标题(中): 数据检测装置
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申请号: US710266申请日: 1996-09-13
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公开(公告)号: US5666341A公开(公告)日: 1997-09-09
- 发明人: Ryusuke Horibe , Toshiyuki Shimada , Hiromiti Ishibashi , Hiroyuki Miyachi
- 申请人: Ryusuke Horibe , Toshiyuki Shimada , Hiromiti Ishibashi , Hiroyuki Miyachi
- 申请人地址: JPX Kadoma
- 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: JPX Kadoma
- 优先权: JPX7-238115 19950918
- 主分类号: G11B19/12
- IPC分类号: G11B19/12 ; G11B20/14 ; G11B27/30 ; H03L7/081 ; H03L7/089 ; H03L7/113 ; G11B5/09
摘要:
A reproduced signal is digitized so as to count a time interval of a specified pattern simultaneously with the count of a clock period of a phase lock loop circuit. A phase lock loop clock frequency is subjected to a feedback control based on the information indicated the difference between the time interval and the clock period. In this manner, a frequency loop performs a feedback operation so that a frequency of the reproduced signal falls within a capture range of a phase lock-in, thereby increasing the speed of phase lock-in.
公开/授权文献
- US4045885A Planetarium with star identifying means 公开/授权日:1977-09-06