it didn't have to be sensitive or even high quality. The beep was loud enough to register on these improvised "mics" and the phase shift of up to 3ms (~50 samples at 16 kHz) was clearly visible
replyThe cross-correlation function can be applied to measure time shift between two waveforms, even those collected from different devices. The accuracy of this is not limited by the sample period. In fact, the two waveforms need not even have a common sample period. I think this approach could let simonw's network become self locating.
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