发明名称 |
INTERROGATOR FOR ELECTRONIC IDENTIFICATION SYSTEM |
摘要 |
Interrogator for an electronic identification system having a first oscillator arranged to vary in frequency in accordance with the frequency of a received signal, a second oscillator arranged to vary in accordance with the frequency of the first oscillator after a delay of a number of cycles of the received signal, a phase discriminator for detecting the phase difference between respective output signals of the first and second oscillators and a phase-change detector arranged to determine the frequency at which the phase changes occur. In this way, a modulation frequency of the received signal can be determined. |
申请公布号 |
EP0823059(A1) |
申请公布日期 |
1998.02.11 |
申请号 |
EP19960912103 |
申请日期 |
1996.04.26 |
申请人 |
BRITISH TECHNOLOGY GROUP INTER-CORPORATE LICENSING LIMITED |
发明人 |
SCHEELEN, JOS |
分类号 |
G01S13/74;G01R25/00;G01S13/75;G01S13/78;G06K7/00;G06K7/08;H03D13/00;H04B1/59;H04B5/02;H04L7/027;H04L7/033;(IPC1-7):G01S13/02;H04L7/02 |
主分类号 |
G01S13/74 |
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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