Mic Jammer Relies on Ultrasound

A DIY maker has built a device that jams smartphone microphones using ultrasonic sound waves that humans can't hear. The latest version uses an RP2040 microcontroller to drive between twenty and eighty ultrasonic transducers, with the signal specifically modulated to confuse the automatic gain control systems that modern phones rely on for clear audio recording. In a demonstration on an iPhone seventeen, the creator's voice became completely unintelligible garbled noise when the jammer was active. Hackaday notes the ingenious part: the interference is inaudible to human ears while still defeating the sophisticated audio processing that powers modern phone microphones.

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