Features

• AcousticBF real-time beam forming software expansion for STM32Cube

• AcousticEC real-time acoustic echo cancellation software expansion for

STM32Cube

• AcousticSL real-time sound source localization software expansion for

STM32Cube

• Complete application including all the acoustic functions in a single sample

application

• Software graphic user interface to easily control parameters and algorithms from

a host PC

• Free, user-friendly license terms

• Sample implementation available on a NUCLEO-F446RE board when connected

to an X-NUCLEO-CCA01M1 and an X-NUCLEO-CCA02M1 expansion board

• Sample implementation available on the BlueCoin starter kit

(STEVAL-BCNKT01V1)

Description

FP-AUD-SMARTMIC1 is an STM32Cube function pack. This software package

implements a complete application targeting advanced processing for MEMS

microphone arrays, including digital MEMS microphone acquisition, beamforming,

source localization and acoustic echo cancellation. The processed audio is sent to a

USB host and a loudspeaker connected to the relevant expansion boards.

The function pack is built on STM32Cube software technology to ease portability

across different STM32 microcontrollers.

This sample implementation supports two kind of systems: STM32 NUCLEO-F446RE

development board equipped with the X-NUCLEO-CCA01M1 or

X-NUCLEO-CCA02M1 expansion boards and the STEVAL-MKI129Vx digital

microphone evaluation board series or the BlueCoin starter kit

(STEVAL-BCNKT01V1).

Product summary

STM32Cube

function pack for

MEMS microphone

acquisition,

advanced audio

processing and

audio output

FP-AUD-SMARTMIC1

Sound terminal

expansion board

based on

STA350BW for

STM32 Nucleo

X-NUCLEO-CCA01M1

Digital MEMS

microphone

expansion board

based on

MP34DT01-M for

STM32 Nucleo

X-NUCLEO-CCA02M1

BlueCoin starter kit

STEVAL-BCNKT01V1

STM32Cube function pack for MEMS microphone acquisition, advanced audio

processing and audio output

FP-AUD-SMARTMIC1

Data brief

DB3275 - Rev 2 - April 2018

For further information contact your local STMicroelectronics sales office.

www.st.com

• BlueCoin starter kit (STEVAL-BCNKT01V1)

FP-AUD-SMARTMIC1

Detailed description

DB3275 - Rev 2

page 3/5

■

■ What can you do with STM32Cube function packs?

The STM32Cube function packs leverage the modularity and interoperability of STM32 Nucleo and X-NUCLEO

boards, and STM32Cube and X-CUBE software, to create function examples, embodying some of the most

common use cases, for each application area.

These software function packs are designed to exploit as much as possible the underlying STM32 ODE hardware

and software components to best fit the requirements of final users’ applications.

Moreover, function packs may include additional libraries and frameworks which do not present the original

X-CUBE packages, thus enabling new functionalities and creating a real and usable system for developers.

What is STM32Cube?

STMCube™ is designed by STMicroelectronics to reduce development effort, time and cost across the entire

STM32 portfolio.

STM32Cube version 1.x includes:

• STM32CubeMX, a graphical software configuration tool that allows the generation of C initialization code

using graphical wizards.

• A comprehensive embedded software platform specific to each series (such as the STM32CubeF4 for the

STM32F4 series), which includes:

– the STM32Cube HAL embedded abstraction-layer software, ensuring maximized portability across the

STM32 portfolio

– a consistent set of middleware components such as RTOS, USB, TCP/IP and graphics

– all embedded software utilities with a full set of examples

How does this STM32Cube function pack complement STM32Cube?

The FP-AUD-SMARTMIC1 firmware is based on the STM32CubeHAL hardware abstraction layer for the STM32

microcontroller, and exploits BSP and middleware layers to build a complete acoustic application based on a

MEMS microphone array. The software acquires audio signals from four digital MEMS microphones, elaborates

them using embedded DSP libraries and streams the processed audio to a USB host and a loudspeaker

connected to the relevant expansion boards.

A software example which performs a set of operations to remotely control the device from a PC host is also

provided.

The package includes several audio DSP libraries:

• the AcousticBF library provides an implementation for a real-time adaptive beamforming algorithm - using

the audio signals acquired from two digital MEMS microphones, it creates a virtual directional microphone

pointing to a fixed direction in space;

•

the AcousticEC library provides an implementation for a real-time echo cancellation routine based on the

well-known SPEEX implementation of the MDF algorithm;

• the AcousticSL library provides an implementation for a real-time sound source localization algorithm: using

2 or 4 signals acquired from digital MEMS microphones, it can estimate the arrival direction of the audio

source.

The firmware provides a sample implementation supporting two systems:

• STM32 NUCLEO-F446RE development board equipped with the X-NUCLEO-CCA01M1 expansion board

(based on the STA350BW Sound Terminal

2.1-channel high-efficiency digital audio output system) or

X-NUCLEO-CCA02M1 expansion board (based on the MP34DT01-M digital MEMS microphones) and

STEVAL-MKI129Vx digital microphone evaluation board series

Detailed description