发明名称 |
Frequency control apparatus and digital signal reproducing apparatus |
摘要 |
A plurality of cross detectors have predetermined threshold levels different from each other. Each cross detector increments a count value when the reproduced signal crosses over its threshold level and generates the accumulated count value as a cross count value. Upon the cross count value agreeing with a common reference value, each comparator sends the coincidence signal to an OR circuit. The OR circuit produces a reset pulse in response to a first-arriving coincidence signal. The reset pulse is supplied to each cross detector to reset the cross count values of all of cross detectors and is also supplied to a down counter to reset it. When the cross count value becomes a predetermined value, an error signal is produced based on a deviation of the bit clock count value relative to a proper value so as to correct the deviation. The frequency control is performed based on the produced error signal.
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申请公布号 |
US6768706(B1) |
申请公布日期 |
2004.07.27 |
申请号 |
US19990427079 |
申请日期 |
1999.10.26 |
申请人 |
VICTOR COMPANY OF JAPAN, LTD |
发明人 |
TONAMI JUNICHIRO |
分类号 |
G11B5/09;G11B20/10;G11B20/14;(IPC1-7):G11B5/09 |
主分类号 |
G11B5/09 |
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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