Comment by diimdeep | Hacker News Reader

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Comment by diimdeep | Hacker News Reader

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...

Today I learned that there are now MEMS microphones which rely on fabricated silicon, not conventional electrical coils or electrostatic/electrets/magnet pickups, to pickup sound waves.

I believe this is the most common type of microphone today. There’s just not enough space in devices like phones and smart watches for anything else. My SM7B is probably the only non-MEMS mic I own.

64dB SNR is pretty standard these days for MEMS – you will pay a lot more to get up in the 70s. Good studio mics will be in the 80dB+ range.

Here's the highest performing one today: https://www.digikey.com/en/products/detail/tdk-invensense/IC...

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