The device is able to force a man to shut up

engineers from the Land of the Rising Sun created a speaker that can silence anyone. Safety device uses knowledge of biology of the speech centers of the brain. Kadzutaka Kurihara (Kazutaka Kurihara) of the National Institute of Industrial Science and Technology, and Koji Tsukada (Koji Tsukada) from Ochanomizu University psychologists have studied the research papers and found out that people almost can not speak, when his words come back to it with ultrashort echo delay. The Japanese decided to use this effect to construct the device SpeechJammer, which could stop any talk. To do this, they joined in a single gadget in microphone and speaker. A microphone records the voice of the speaker and the speaker relays it to the side of the speaker with a delay of 0, 2 sekundy.

And a microphone and speaker direction, because the device can be used as a gun, silencing a specific person or group of people. However, the distance that "reaches" the muffler does not exceed 30 meters. In addition to the microphone and speaker "on board" device arranged laser pointer, range finder, a chip that calculates the distances and forwarded signals and battery. Engineers have tried unusual silencer and said that its impact does not bring any physical discomfort chattering people. During testing new items also identified a number of other interesting details. Thus, the muffler can not stop the meaningless sounds, like sighs and interjections. And yet SpeechJammer was more effective when the delay was varied and when it was used against reading out loud, rather than leading the spontaneous monologi.

Technology Review suggests that the device is useful for neutralizing boomy at conferences and in regular theaters, libraries, reading rooms. Sorry, no source did not specify who and where so took the device inventors that they decided to establish their directional squelch.

Source: www.vesti.ru/doc.html?id=732891&cid=780