FP-AUD-SMARTMIC1 provides a firmware running on STM32 which acquires audio signals of four digital MEMS microphones, elaborates them by means of embedded DSP libraries and streams the processed audio to both an USB host and a loudspeaker. Please check st.com where a more recent version of the software might be available.

FP-AUD-AEC1 STM32Cube Function Pack for Acoustic Echo Cancellation is a specific example fully focused on Acoustic Echo Cancellation and provides an implementation of a USB smart speaker use case with microphone. Please check st.com where a more recent version of the software might be available.