发明授权
US4935912A Circuit for digitally generating a tracking error signal to avoid offset
monitoring
失效
用于数字产生跟踪误差信号以避免偏移监测的电路
- 专利标题: Circuit for digitally generating a tracking error signal to avoid offset monitoring
- 专利标题(中): 用于数字产生跟踪误差信号以避免偏移监测的电路
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申请号: US197240申请日: 1988-05-23
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公开(公告)号: US4935912A公开(公告)日: 1990-06-19
- 发明人: Hiroyuki Hirano , Akira Motoyama
- 申请人: Hiroyuki Hirano , Akira Motoyama
- 申请人地址: JPX Tokyo
- 专利权人: Pioneer Electronic Corporation
- 当前专利权人: Pioneer Electronic Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX62-125337 19870521
- 主分类号: G11B7/09
- IPC分类号: G11B7/09 ; G11B21/10
摘要:
A circuit for computing a tracking error signal digitally. Under control of appropriate timing, input RF signals are latched in successive latches, and outputs of the latches are compared. The latch (9) whose output is D/A converted as a tracking error signal is controlled by suitable logic (25) to latch an output of a preceding latch (8), that output being used to provide input to the logic (25) through a threshold circuitry which includes adders (21,22) and comparators (14,15). The circuit takes advantage of servo patterns on surfaces of disks, particularly optical disks, to provide track count and on-track status. The digital approach removes the necessity for using capacitors or other types of sample-and-hold circuitry, and for controlling offset values.
公开/授权文献
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