Hi, If you control the noise source, then I would do as Michael suggests. The project I remember is called ActiveBAT: http://www.cl.cam.ac.uk/research/dtg/research/wiki/BatSystem
If you can't control the source and in particular don't know when the sound source started emitting, you can't use timing with a single node. You still could triangulate the sound source's position if you have several nodes whose position you know and with which you manage to establish the phase difference of the received signal. If you have a fairly good idea of the characteristics of the sound source, especially the amplitude of the signal it emits, you could probably estimate its distance by measuring the amplitude of the received signal. This would be extremely imprecise. I seem to vaguely remember that the propagation speed of sound depends on its frequency (maybe only true for underwater?). In that case if you know the characteristics of the original sound you could probably calculate the sound source's distance by measuring the distortion of the signal. Cheers, Urs Michael Schippling schrieb: > _never_ use IE....heh... > > My memory fails on the details, but there are some examples of timing > the difference in reception time of an audio ping with a simultaneous > radio message. Perhaps three or four years ago... > > I can't even come up with a good set of keywords right now, but some > grueling google or list searching should get you pointers. > > MS > > Mohammad Allouh wrote: >> >> hi >> >> sorry for the previous email, it is becuase of IE, any way .... >> >> I am using tinyos 1.1.13 , MIB510, MTS300 from crossbow >> >> I have implemented an application to read the MIC reading from the >> sensor node and dispay this value while it is changing >> >> my question is: Can I use the MIC readingto estimate a relative >> distance between the wireless sensor and the sound source ?? if so , >> HOW ???????????? >> >> >> >> thanx in advance >> >> ------------------------------------------ >> Mohammad Sa'ad Allouh >> Mobile: 0788131024 >> Email: [EMAIL PROTECTED] >> Irbid - Jordan _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
