Comment by diimdeep

Instead of Pi it could have been a dozen different IC, but interesting part in this kind of project is audio theory, and MEMS microphone performance.

MEMS microphone used here is mp23db01hp

https://www.st.com/en/mems-and-sensors/mp23db01hp.html

and it looks like better than ICS 43434 that I stumbled on before

https://invensense.tdk.com/wp-content/uploads/2016/02/DS-000...

For theory about how microphone works and performs interesting read is

https://www.analog.com/en/analog-dialogue/articles/understan...