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Occupancy Sensor Interference

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The problems I have heard about with occupancy sensors don't involve RF.  Rather some use ultrasonic signals as the detection mechanism.  These signals, though inaudible, can be quite strong and can be picked up by a microphone.  In certain transmitters, the low pass filtering on the input is not sufficient to prevent the ultrasonic signal from having an effect on the compander stage.  This creates artifacts that show up in the audible frequencies.

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