发明授权
US4942487A Apparatus for recording/reproducing a digital signal at variable speeds
失效
用于以可变速度记录/再现数字信号的装置
- 专利标题: Apparatus for recording/reproducing a digital signal at variable speeds
- 专利标题(中): 用于以可变速度记录/再现数字信号的装置
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申请号: US157795申请日: 1988-02-19
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公开(公告)号: US4942487A公开(公告)日: 1990-07-17
- 发明人: Takaharu Noguchi , Takao Arai
- 申请人: Takaharu Noguchi , Takao Arai
- 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: JPX62-56768 19870313
- 主分类号: G11B5/09
- IPC分类号: G11B5/09 ; G11B15/18 ; G11B15/467 ; G11B27/00
摘要:
A digital signal recording/reproducing apparatus for enabling recording/reproduction at variable speeds including normal speed, and at least one of N-times normal speed and 1/N-times normal speed while maintaining the reproducing frequency constant so as to not require switching of analog circuits. At the time of reproduction at normal speed, N-times normal speed or 1/N-times normal speed, the feed speed of the magnetic tape and the timing of picking up of a reproducing signal from the magnetic tape are varied while the speed of revolution of a cylinder of a rotary head is maintained constant so that the timing of detection of pilot signals for generating a tracking error signal is varied to cope with difference in track scanning conditions in recording and reproducing modes.
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