Conversation

Notices

1. Don Romano (alt) (thor@noagendasocial.com)'s status on Saturday, 20-Apr-2019 09:40:40 EDT Don Romano (alt)

   With only 2 elements in the microphone array, i was getting a polar plot resembling a figure-eight pattern sideways close to 20 kHz. I didn't like that, so I tried an experiment where I doubled the array to 4 microphones, arranged in a square. This improved the pattern — it now has a, uh, dentoid (tooth-like) pattern close to 20 kHz, and the sideways Bode plot is very interesting — it cuts the high end by 6 dB.

   #CardioidMEMSMicrophoneArray

   1. Don Romano (alt) (thor@noagendasocial.com)'s status on Saturday, 20-Apr-2019 09:51:01 EDT Don Romano (alt)

      in reply to

      Note: The physical size of this microphone array would only be about 9x9mm (⅓x⅓"), with a pitch of 7.15mm between each element. It doesn't need to be any bigger than that, and due to frequency tuning, it shouldn't be any bigger either.

      #CardioidMEMSMicrophoneArray