Thank you very much for the time you spent responding to us.
I had another project to work on, and I didn’t test PulseAudio yet !
But we managed to achieve clear sound with little to no echo by :
- Changing the microphone to AUMM-3842, two-ports, uni-directional type
- Creating new mic amplifier
- Changing the microphone location
- Switching to WEBRTC echo cancellation
We have good results for audio capture in noisy outdoor environments.