发明名称 |
Apparatus and method for demodulating data signals read from a recording medium |
摘要 |
An apparatus for demodulating a data signal read from a recording medium, in which data is recorded on at least a portion of the recording medium. The data is recorded using a recording system having a substantially constant linear velocity. In this manner, the recording medium is rotated at a substantially constant speed during the reading of data signals such that one of a frequency and an amplitude of the read data signal varies. The apparatus includes a signal processor for processing the read data signal in response to a change in one of the frequency and amplitude to produce a processed data signal suitable for demodulation. Once the processed data signal is produced, a demodulator operates to demodulate the data signal and to produce a demodulated data signal.
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申请公布号 |
US5877907(A) |
申请公布日期 |
1999.03.02 |
申请号 |
US19960723669 |
申请日期 |
1996.09.30 |
申请人 |
FUJITSU LIMITED |
发明人 |
TANISHIMA, HIDEAKI;TOMITA, NORIKO;TOMITA, MASATO |
分类号 |
G11B20/10;G11B20/12;(IPC1-7):G11B20/06;G11B5/09 |
主分类号 |
G11B20/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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