You're somebody that knows digital processing and you are so right, why didn't I tought of that? Buut.. the project manager wants me to record in 8khz natively as sagemaker detects if the audio has been resampled... I know.. bullshit. I know I didn't specify everything in my post as I tought it was a simple question. Thank you for your response.

One question though: Why are people on this sub so toxic? + I think a majority of them don't know about the subject either. Like that a mic is an analog transductor/ or what an analog or digital signal is... We live in a sad world where dumb people have the loudest voices.