Dual threshold amplitude detector
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United States of America Patent
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Jan 3, 1989
Grant Date -
N/A
app pub date -
Feb 20, 1987
filing date -
Feb 20, 1987
priority date (Note) -
Expired
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Abstract
An amplitude detector is disclosed passing only video input signals whose voltage amplitudes are within specified minimum and maximum limits, and is particularly useful in a secondary radar system for filtering out FRUIT, friendly replies to unintentionally interogated targets. A pair of comparators (4 and 31) compare the video input signal (2) against respective first and second threshold voltages (V.sub.th1) and V.sub.th2). The outputs (30 and 33) of the comparators (4 and 31) and AND'ed (34) with each other and with a digitized video signal (32) to actuate a one-shot pulse generator (12) for gating (36) a delayed digital video signal (40) through an output AND gate (22) to yield a video output signal (42).
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