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The common denominator here seems to be that it happens in secure US Government buildings. I have to wonder whether it’s related to the security technology itse
by jameshart 5y ago
The common denominator here seems to be that it happens in secure US Government buildings. I have to wonder whether it’s related to the security technology itself, like some noise cancellation tech incorporated into the standard SCIF security system interferes badly with the ultrasound sensors of the intruder alarms to create these noise artifacts…
- jonny_eh 5y agoFrom the article: > We also found electronics stores that carry high- power ultrasonic jammers that cause microphones to malfunction
- gricardo99 5y agoand: If a signal from that caliber jammer were to combine with a second ultrasonic source, audible by-products could result.