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1. Don Romano (alt) (thor@noagendasocial.com)'s status on Monday, 15-Apr-2019 17:08:19 EDT Don Romano (alt)

   All MEMS microphones have an upward bend on the high end of the spectrum. I found the explanation for this in a technical paper: It's not an issue with diaphragm resonance as I originally thought. It's the microphone cavity that forms a Heimholtz resonator. When you blow a bottle, that's a Helmholtz resonator. Speakers with bass ports are also Heimholtz resonators. It creates a peak at a particular frequency, determined by the shape of the opening and the volume of the cavity.

   1. Don Romano (alt) (thor@noagendasocial.com)'s status on Monday, 15-Apr-2019 17:14:01 EDT Don Romano (alt)

      in reply to

      I'm still fascinated with MEMS microphones. I wish I knew more about DSP algorithms for beamforming.