Thread: [Request] Sonar
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lardman is offline lardman
2010-11-25 , 18:08
Posts: 2,102 | Thanked: 1,309 times | Joined on Sep 2006
#2
Originally Posted by TiagoTiago View Post
I'm not sure about the processing power and time resolution, but in terms of geometry i know it should be possible to use the stereo speakers and the microphone on the N900 to acquire a 2 dimensional image from the surroundings by sonar.
This is quite difficult...

Originally Posted by TiagoTiago View Post
If the framerate is fast enough, you don't even need to just do single pulses, use a pseudo-random number generator to pick the frequencies and then look for the spikes in the recorded sound for the frequencies in the order they came out; if t is really fast it might even sound close to white noise.
You will probably want to send a coded pulse anyway as you can then cross correlate to try to pick out the reflection arrival time more easily (unless you can generate very large amplitude sounds, but that might be intrusive ). The problem (apart from how loud you can emit, how well you can receive, and ambient noise, is then reflections, and whether you can tell them apart.