[PD] Measuring position between two microphones?

[Charles Henry]

Another thought...
When you have the two microphones, just correlate the noise between
the two channels (not from the output/input1 and output/input2, but
between input1/input2).  When the speaker is equidistant from each
microphone the delay is 0 (located at exactly half a block on the
output from sxcov~.pd or sxcorr~.pd).  Then, the distance from the
center is simply proportional to the measured delay between the
signals, divided by 2.
e.g. at 44100 kHz, given c=343 m/sec
distance from center=(delay in samples)/2/44100*343, meters

and the resolution is about 4 mm

noted difference: sxcorr~ accumulates it's values over time, so that
you can get more accuracy, from using longer signals
sxcov~ is instantaneous and not accumulated

Chuck