After Antoine post (Kudly is able to speak), we manage to encode data from the microphone. We take a bad microphone, but now Alexis give us a electret microphone and it works !
We take the data from the micro, the codec encode the sound in OGG Vorbis, and we stock it on the SD card. For now there is a lot of noise, but I think the settings can be optimized.
Dimitri, happy 🙂