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Natural Science Forum / Physics / Acoustics / March 2004detecting microphone position
Hi, I plan to try to experiment with detecting position of the microphone using two speakers. I was thinking about placing two speakers about 1m -1,5m apart and measuring the delay beetween what is played and what is recorded to find distance beetween microphone and both speakers. Do you think it is possible? Where can I find some useful information? Jacek > I plan to try to experiment with detecting position of the > microphone using two speakers. [quoted text clipped - 4 lines] > Do you think it is possible? > Where can I find some useful information? Hi Jacek Gacek, The question is not clear for me. You have a loudspeaker replay situation in the usual stereo 1.50 m triangle. You use a single mono microphone. You want to find the distance between microphone and the speakers? You want to detect the single microphone position and not the distance of a sound source? Eberhard Sengpiel >>I plan to try to experiment with detecting position of the >>microphone using two speakers. [quoted text clipped - 3 lines] >>microphone and both speakers. >>Do you think it is possible? Yes >>Where can I find some useful information? For what? It seems a pretty straightforward idea. There is an ambiguity to do with whether you are in front of or behind the speakers, other than that it is just geometry. > Hi Jacek Gacek, > [quoted text clipped - 3 lines] > You want to find the distance between microphone > and the speakers? sounds like it > You want to detect the single microphone position > and not the distance of a sound source? that's what he said (eg mic on a robot - where is it in the room?) Cheers Greg Locock > > You want to find the distance between microphone > > and the speakers? [quoted text clipped - 3 lines] > that's what he said (eg mic on a robot - where is it in > the room?) Hallo Greg, I am from the sound recording side. Look at: http://www.sengpielaudio.com I never had that idea of finding the microphone position in front of stereo speakers. A microphone on a robot - interesting, but OK. Thanks. Eberhard Sengpiel > Hi, > [quoted text clipped - 6 lines] > Do you think it is possible? > Where can I find some useful information? This query reminds me of the LORAN navigation system. The delay between the speaker signals will you one piece of information. That being which two hyperbola the microphone is on. You need an additional piece of information to determine the distance and direction. Either rotate the speakers and repeat the test signal to determine another pair of hyperbolic lines and sign(which direction), or add a third speaker in forming an equilateral triangle. |
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