[linux-audio-dev] sonar tracking question

[Jens M Andreasen]

On fre, 2004-07-16 at 21:42, Tim Blechmann wrote:
> hi all,
> 
> i'm currently working on an installation, where i have to track persons
> in a room ...

Is that a single person at a time or several people walking around at
random?

> in theory it should be possible to track a person by the time the sound
> will need to reach the microphone ... i know, these are only ms, but
> using a tricky algorithm, it might be possible ...

With a samplerate of say 48k and two microphones you can measure phase
differences down to 1/48ms or 330m/48000 = 0.7cm

I don't know what kind of soundsource you are facing, but if it is
anything like this:
   
   http://www.huutajat.org/HyvaMP3.mp3

... you are bound to fail ;)


mvh // Jens M Andreasen


> has anyone been trying to work on something like that? if so, i'd like
> to hear about the results ...
> 
> cheers... tim