Hi Oliver,
The projects that are in our X-Cube-LocalVUI package only use a single mic that is located on the Discovery kit itself. Why? The Audio Front End (AFE) DSP blocks that are used when there are more than one mic are not deployed in the X-Cube-LocalVUI package. The AFE blocks must be deployed under NDA and your business needs to be qualified in order to make DSP blocks and tools free of charge for customers to use in production. So, when we qualify the customer opportunity, we can deploy the AFE and an updated X-Cube-LocalVUI package that runs on our Discovery boards and uses the external mic board. For production, the customers must use STM32 devices that have part numbers ending with an “E�? at the end (for example: STM32H753VIT6E). However, we can also qualify any STM32 for use as long as it has have enough performance to run the AFE DSP blocks needed and the potential business volume supports this (must be a production project with qualified volume potential). These “E�? devices (and any STM32 eval board) are the only STM32 devices that will run the AFE DSP Blocks.
Alternately, we can deploy a project for Sensory Voice Hub like those inside the X-Cube-LocalVUI package but do not have the AFE DSP blocks and DOES have the external mic board enabled but we do not see a use for this use case unless the customer is doing their own DSP on the audio. In reality, we do not see a single production use case that will not strongly benefit from using an AFE with DSP blocks. If you wish get this project without the AFE DSP blocks, or you wish to explore getting access to the complete package with the AFE DSP blocks, please send me an email at greg.davis@st.com and we can discuss. Thank you!
