Hahaha amazing. Also cool to hear stories about headphones used as mics, I didn't think it would be sensitive enough for that.
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
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