Speechjammer

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Delayed auditory feedback , or DAF, devices have been used to help stutterers for decades. If a stutterer hears his own voice at a slight delay, stuttering often improves. But if a non-stutterer uses a DAF device designed to help stutterers, he can start stuttering — and the effect is more pronounced if the delay is longer, up to a certain point.

Being at a distance from the target means it's possible to aim the device at people who are several feet away — sort of like a TV B-Gone , but for people. Bothered by what someone at a meeting is saying? Point the SpeechJammer at him. Can't stand your nattering in-laws? Time for the SpeechJammer. In the wrong hands — criminals, for instance, or repressive governments — the device could have potentially sinister applications.

For now, it remains a prototype. Content This content can also be viewed on the site it originates from. Geeta Dayal is a frequent contributor to Wired and many other publications, writing on art, culture, technology, and design. Staff writer Twitter. Topics audio Current Affairs Japan Sci-fi. Kurihara and Tsukada have posted a YouTube video of their Speech Jammer in action, which you can see below.

The speech jammer is composed of a directional microphone, a time delay integrated circuit, and a directional speaker to play the sound back. All of the components are well known, but the novelty stems from how they are used together. The first microphones transferred sound energy into mechanical energy, and most modern microphones transfer sound energy into electrical signals.

Sound energy is just a compression wave that travels in a substance such as air. As the sound wave passes through a substance, there are sections where the molecules get bunched up compressed and sections where they get spread apart rarefied.

This is similar to a compression wave in a slinky, as shown in the video below. A sound wave can transfer mechanical energy to an object, changing its position. In turn, this change in position can easily be transformed to a change in electrical signal. One type of microphone changes the distance between two conducting plates, often containing carbon between them. A small electric current moving electric charge flows through the plates.

The outer plate acts as a movable membrane or diaphragm that changes location as the sound wave strikes it. Another type of microphone utilizes a change in the intensity of a laser beam reflected off of a diaphragm. Some microphones use crystals that change pressure as a sound wave strikes it, causing a change in voltage. Yet another type utilizes the motion of a current carrying coil connected to a diaphragm that vibrates when the sound strikes it.

This method is basically a speaker in reverse. All in all, microphones function because the sound wave strikes an object usually called the diaphragm within an electric circuit. The change in location ultimately causes either a change in electric current motion of charged particle or voltage energy per charged particle within the circuit. Also, speakers can be used in reverse as a microphone.

A speaker consists of a diaphragm often made of paper , connected to a rigid support frame or basket through a suspension system spider. Within the suspension system is a coil of thin wire voice coil that is free to move up and down along a pole. There is also a permanent magnet housed in the base of the speaker. A Speaker. Image Credit : Lain via Wikimedia Commons. When an electric current goes through the coil of wire it produces a magnetic field that interacts with the permanent magnet.

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