发明名称 |
Circuit for discriminating received signal modulation type |
摘要 |
A circuit for discriminating the modulation type of a received signal capable of discriminating the modulation type at high speed. This circuit includes: a clock recovery circuit for recovering a data clock from received data; a phase difference detector for detecting a phase difference between the data clock recovered by the clock recovery circuit and the received data; a deviation calculation circuit for calculating a deviation between the phase difference detected by the phase difference detector and a deviation reference value preset in accordance with a modulation type; a squaring circuit for squaring the deviation calculated by the deviation calculation circuit; an average value calculation circuit for calculating an average value of a predetermined plurality number of consecutive ones of the square output calculated by the squaring circuit; and a comparator for comparing the average value calculated by the average value calculation circuit with a predetermined decision reference value and outputting a discrimination signal in accordance with the comparison results.
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申请公布号 |
US5600673(A) |
申请公布日期 |
1997.02.04 |
申请号 |
US19950566082 |
申请日期 |
1995.12.01 |
申请人 |
KABUSHIKI KAISHA KENWOOD |
发明人 |
KIMURA, KIMIYOSHI;SHIRAISHI, KENICHI;SHINJO, SOUICHI |
分类号 |
H04L27/18;H04L27/00;H04L27/22;(IPC1-7):H04B3/46 |
主分类号 |
H04L27/18 |
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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