Electromagnetic wave receiver
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United States of America Patent
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-
May 31, 1988
Grant Date -
N/A
app pub date -
Apr 28, 1986
filing date -
Apr 28, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A receiver includes a receiving circuit for receiving an electromagnetic carrier wave modulated by a message signal, a detector ciruit for separating the message signal from the carrier wave, and an output circuit. The detector circuit has a Q ratio sufficiently low that the detectable band width is more than twice the modulation frequency change. The detector output signal has a noise voltage level when no carrier is present that is higher than the voltage of the message signal with a carrier present. An output circuit senses the level of the detector output signal and passes signals with a voltage level below a predetermined level and otherwise blocks the output signal. The filtering of the output circuit is sufficiently low that its response time is faster than a tenth of a second. The output circuit includes a noisy input related to the detector output and a reference input. A pair of diodes connect the noisy input and the reference input enabling the reference input to track the noisy input to prevent false data outputs.
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