Directional SPeaker

I saw a youtube video of a guy who built his own directional speaker (actually I remember it as a directional megaphone as he would talk into it, and it would target a person). I was wondering how easy it would be to do this? Can we build one with household material? Thanks for being awesome guys!

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JasonN311 year ago

hey ladies

see what i found

beyondal2 years ago

Hi any resolves on this matter?

Kidkodave3 years ago

Hi guys, i've found this great TED talk about a guy who build some:

Autotelic7 years ago
I was just thinking the other day it would be wicked to make one of these things! Apparently.................. It works a bit like binaural beats, in that an object intercepts the path of two high frequency waves (in this case 200,000hz) and the two waves collide (kinda) and produce a much lower frequency wave that is within the range of human hearing (20-20,000 hz). You need to produce two high frequency waves (with some piezo electric transducers), one is constant and the other one varies according to the input from an audio source (say a microphone). Maybe ou could use an Arduino to process the audio input and convert it into the higher freqs using the tranducers? Then you just stick it inna dish and point it at some unsuspecting passer by!
teamcoltra (author) 8 years ago
Not to "bump" but I am curious also, is there another name for a directional speaker? I cannot find any information on them.
the only names i have heard them be called is directional speakers or spot light audio. from what i understand the speaker produces  ultrasound waves  like those used in medical equipment that travels in the given direction and vibrates molecules in the air producing sound.
mythros mythros7 years ago
Kiteman8 years ago
Maybe you could include a link to the video?
teamcoltra (author)  Kiteman8 years ago
I was looking for it but can't find it (damn the internet being soo big) It was something like college student directional speakers whispers to students in the library. I forget the name :( All I know is that he could point sound at a person

I think you need the word parabolic, and it may not be speakers, it might just be reflectors.

A parabolic reflector is the particular shape of satellite dishes and the mirrors in telescopes.

For sound, if you whisper towards the reflector from the focal point, the sound is reflected into a very directional "beam" (not exactly a beam, but you get the idea). If the sound hits another parabolic reflector, then somebody at the focal point can clearly hear the whisper.

In the Science Museum in London, they (used to?) have a giant pair of reflectors, several metres wide, that meant you could hear a whisper right across a large, crowded room.
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