(That could be how the targeted audio advertising in Minority Report (video below) would work.) Construction information is here. The speaker uses a “ parametric array” - the same principle as the Audio Spotlight and the HyperSonic Sound System. The parametric speaker modulates the voice audio onto an ultrasonic beam, which perturbs the air in a narrow beam, demodulating the audio to generate audible sound to anyone within that beam. The “delayed auditory feedback” (DAF) effect is similar to what you experience when echo suppression fails on Skype voice chat.Īs described in the arXiv reference cited below, the device basically includes a laser pointer, directional microphone, distance sensor, microcomputer for delay, and parametric (directional) speaker. It works by recording your words and then sending them back with a delay of a few hundred milliseconds (it’s more effective when the time delay varies). They’ve developed the “Speech-jammer” gun, which will reduce you to incoherent stuttering from up to 90 feet away. Sun)Īttention, telephone babblers, library whisperers, and hecklers: Japanese researchers at the National Institute of Advanced Industrial Science and Technology want you to shut the bleep up. The speech jammer prototype (credit: the U.K.

Speech zapper effect