STM32 Nucleo

expansion boards

Hardware

Application

FP-AUD-SMARTMIC1

X-NUCLEO-CCA01M1 (Translate)

X-NUCLEO-CCA02M2 (Sense)

STM32 Nucleo

development board

STEVAL-BCNKT01V1

evaluation board

PDM2PCM

AcousticBF

Middleware

STM32Cube Hardware Abstraction Layer (HAL)

Hardware

Abstraction

AcousticEC

AcousticSL USB Device Serial Protocol

Features

• Software expansions for STM32Cube:

– AcousticBF real-time beam forming

– AcousticEC real-time acoustic echo cancellation

– AcousticSL real-time sound source localization

• 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 development board

when connected to an X-NUCLEO-CCA01M1 and an X-NUCLEO-CCA02M2

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-

CCA02M2 expansion boards and the STEVAL-MIC001Vx, STEVAL-MIC002Vx or

STEVAL-MIC003Vx digital microphone evaluation boards 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

MP34DT06J for

STM32 Nucleo

X-NUCLEO-

CCA02M2

BlueCoin starter kit

STEVAL-

BCNKT01V1

Applications

Sound Sensing

Speakers

Remote Controls

STM32Cube function pack for MEMS microphone acquisition, advanced audio

processing and audio output

FP-AUD-SMARTMIC1

Data brief

DB3275 - Rev 3 - January 2020

For further information contact your local STMicroelectronics sales office.

www.st.com

1 Detailed description

1.1 What can you do with STM32Cube function packs?

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

boards together with STM32Cube and X-CUBE software to create function examples for some of the most

common use cases of different application technologies.

These software function packs are designed to exploit the underlying STM32 ODE hardware and software

components as much as possible to best satisfy the requirements of final user applications.

Moreover, function packs may include additional libraries and frameworks that are not present in the original X-

CUBE packages, thus enabling new functionalities allowing real and usable system for developers.

1.2 What is STM32Cube?

STM32Cube is a combination of a full set of PC software tools and embedded software blocks running on STM32

microcontrollers and microprocessors:

• STM32CubeMX configuration tool for any STM32 device; it generates initialization C code for Cortex-M

cores and the Linux device tree source for Cortex-A cores

• STM32CubeIDE integrated development environment based on open-source solutions like Eclipse or the

GNU C/C++ toolchain, including compilation reporting features and advanced debug features

• STM32CubeProgrammer programming tool that provides an easy-to-use and efficient environment for

reading, writing and verifying devices and external memories via a wide variety of available communication

media (JTAG, SWD, UART, USB DFU, I2C, SPI, CAN, etc.)

• STM32CubeMonitor family of tools (STM32CubeMonRF, STM32CubeMonUCPD, STM32CubeMonPwr) to

help developers customize their applications in real-time

• STM32Cube MCU and MPU packages specific to each STM32 series with drivers (HAL, low-layer, etc.),

middleware, and lots of example code used in a wide variety of real-world use cases

• STM32Cube expansion packages for application-oriented solutions

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-CCA02M2 expansion board (based on the MP34DT06J digital MEMS microphones) and STEVAL-

MIC001Vx, STEVAL-MIC002Vx or STEVAL-MIC003Vx digital microphone evaluation boards

• BlueCoin starter kit (STEVAL-BCNKT01V1)

FP-AUD-SMARTMIC1

Detailed description

DB3275 - Rev 3

page 2/4