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The speakers would have to be able to emit ultrasonic waves. I'm pretty sure that you need special hardware for this. (because the researchers themselves used a
by narrowtux 9y ago
The speakers would have to be able to emit ultrasonic waves. I'm pretty sure that you need special hardware for this. (because the researchers themselves used a special ultrasonic emitter, not the speaker of the phone they used).
- beager 9y agoGood point. I wouldn't trust that the speaker on a mobile phone has a very good frequency response, but a TV or car stereo might be able to swing it.