发明授权
- 专利标题: Apparatus and method for correcting asymmetry of optical disk reproducing system
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申请号: US09902311申请日: 2001-07-10
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公开(公告)号: US06611485B2公开(公告)日: 2003-08-26
- 发明人: Je-Kook Kim , Young-Wook Jang , Suk-Jung Lee
- 申请人: Je-Kook Kim , Young-Wook Jang , Suk-Jung Lee
- 优先权: KR9759072 19971110; KR9816296 19980507
- 主分类号: G11B576
- IPC分类号: G11B576
摘要:
In an apparatus and a method for correcting asymmetry in an optical disk reproduction system, an analog RF signal is received from an optical diode and an asymmetry-corrected signal is output as a digital EFM signal. The apparatus includes envelope detectors for detecting upper and lower envelopes of the RF signal, a level controller for controlling the level of the sum of the upper envelope and the lower envelope and for outputting signal having the controlled level, and a comparator for comparing the level of the signal output from the level controller with the level of the RF signal and for outputting the comparison result as the digital EFM signal.