Make I2S mic usable standalone#7

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HorstBaerbel wants to merge 2 commits intoikostoski:masterfrom

HorstBaerbel:master

Commits on May 28, 2021

Make I2S mic usable standalone
Bim Overbohm
committed

Commits on Jul 19, 2021

Refactor filters. Apply filter and gain separately
Bim Overbohm
committed