发明授权
- 专利标题: Signal recording method and apparatus
- 专利标题(中): 信号记录方法和装置
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申请号: US823705申请日: 1977-08-11
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公开(公告)号: US4146099A公开(公告)日: 1979-03-27
- 发明人: Hiroshi Matsushima , Yasuharu Shimeki , Nobuyoshi Kihara
- 申请人: Hiroshi Matsushima , Yasuharu Shimeki , Nobuyoshi Kihara
- 申请人地址: CA Anaheim
- 专利权人: Christopher Scientific Company
- 当前专利权人: Christopher Scientific Company
- 当前专利权人地址: CA Anaheim
- 优先权: JPX51-98458 19760817; JPX51-160578 19761227; JPX51-160585 19761227
- 主分类号: G11B20/18
- IPC分类号: G11B20/18 ; G06F11/10
摘要:
Signal recording method and apparatus for efficiently correcting a bit error due to dropout occurred in recording an analog data into a digital data and reproducing the digital data is disclosed. The digital signal converted from the analog signal is divided into a plurality of groups to each of which a parity check bit is added. Record pattern is recorded on a record medium by a recording apparatus in accordance with a regular coding such as FM (frequency modulation) or MFM (modified frequency modulation) coding such that more than one bits in a group are not simultaneously influenced by the dropout, e.g. individual bits in a group are spaced from each other by several tracks. On reproducing, the coded digital signal is decoded into the original digital signal and the dropout is detected utilizing the nature of the regularity of the coding. The parity is checked for each of the groups. In this a single error in the group can be corrected and a double error is supplemented by holding a previous value, whereby the error due to the dropout is reduced.
公开/授权文献
- US5771537A Handle device adapted to be attached to two mounting holes 公开/授权日:1998-06-30
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