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We sell these handy PDM mic breakouts in the Adafruit shop.
On many platforms, the chips will do the decimation and filtering for you and give back a PCM value. On the SAMD, we get the raw PDM bitstream. We wrote a basic FIR/sinc filter, as seen here.
The quality is pretty good, but it isn't as good as we think it could be! Are you a filtering fan, who wants to work on improving this code to get better quality output? We'd love to hire you to do that!