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ArmDeveloperEcosystem / microphone-library-for-pico

Capture audio from a microphone on your Raspberry Pi Pico or any RP2040 based board. 🎤
Apache License 2.0
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Filtering for PDM Mic #10

Closed lucas-andersen closed 2 years ago

lucas-andersen commented 2 years ago

Hello,

I would really appreciate if you explained the filtering that is implemented for the PDM microphone. Should I be concerned at all about aliasing when using the PDM microphone for an audio classification task with potential sounds above 8kHz? Thanks!

sandeepmistry commented 2 years ago

Hi @lucas-andersen,

I'm not overly familiar with the filtering code, the code was taking from here: https://os.mbed.com/teams/ST/code/X_NUCLEO_CCA02M1//file/53f8b511f2a1/Middlewares/OpenPDM2PCM/

Are you experiencing any aliasing?

stale[bot] commented 2 years ago

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.