android as a ultrasonic sound emitter and receiver [closed]

Question

I want one of my android phones to emit sounds that are unhearable by human, and the other to listen to it and analyse frequency and so on. Is it even possible?

And my next question is - can mic support two channels? I want to analyse if the sound comes from the left of my device or right of it. Is it possible?

Answer 1

Try this

Change the frequency to beyond 20000 and see if you can get what you want.

Answer 2

I doubt the phones can reproduce sounds over 16KHz. Also the microphone won't be able to record those kind of frequencies as well.

For your second question, if your device has stereo microphone it is possible, you can find more about this on the following link: http://androidforums.com/samsung-galaxy-note/536841-stereo-audiorecord.html.