Reference: Microflown website

The microflown is a 1D air velocity sensitive sensor. This is different from a microphone. Instead of detecting a pressure wave, it detects the velocity of the pressure wave. This allows it directionality from a single sensor. By it's very nature, it detects the air velocity in a single direction. This can be somewhat simulated by using two microphones and comparing the signals to determine which "hears" the sound first. However, the microflown sensor does this comparison by physics instead of signal processing. By combining three sensors in an X-Y-Z orthogonal arrangement, you can make a very small, very accurate sound direction meter. By adding in a standard microphone and mixing or filtering the sound based on the speed, you can create a programmable directional microphone, or perform stereo recording from a single audio location.

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