发明名称 |
Signal analysis apparatus including recursive filter for electromagnetic surveillance system |
摘要 |
The specification discloses a digital/analog signal analyzer for an electromagnetic surveillance system. Included is a notch filter having a switched capacitor filter controlled by a phase lock loop for nulling a time-varying driving frequency from the received signal. The analyzer further includes structure for digitizing the received signal and for implementing a recursive filter to enhance digital feature extraction. The recursive filter in turn includes structure for delaying a read address for subsequent use as a write address to facilitate the rapid updating of data in memory. Also included is a digital-to-analog converter assembly having a pair of piggy-backed digital-to-analog converters to produce an analog signal dependent upon both a mantissa and an exponent of a digital number in scientific notation.
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申请公布号 |
US4668942(A) |
申请公布日期 |
1987.05.26 |
申请号 |
US19840673015 |
申请日期 |
1984.11.19 |
申请人 |
PROGRESSIVE DYNAMICS, INC. |
发明人 |
ECCLESTON, LARRY;GOODRICH, II, EARL R.;SWASDEE, MANOT |
分类号 |
G08B13/24;(IPC1-7):G08B13/24 |
主分类号 |
G08B13/24 |
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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