Acoustic Position Measuring Device

Stefan Strahl stef at
Tue Aug 19 22:41:20 CEST 2008

Hi Openmoko list :)

Cool idea :) As already mentioned you won't get a real validated
measurement system, but it should be fun enough :)

I would suggest using a (MLS) instead of
a sweep or alike. As its spectrum is flat you will hear only a white
noise like sound. From the measured impulse response we can then get
the direct speaker-microphone path and the distances to the reflecting
surfaces as Rusty explained.

Once I got my freerunner (should have arrived at last
friday and any day at my doorstep :) ) I will test the speaker/mic
quality. If someone needs a MLS of length 2^n just let me know and I
can mail the sequence.

:) stefan

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