Applications &

demonstrations

FP-AUD-AEC1

Hardware Abstraction

Layer API

Board Support

Package

Middleware

Hardware

Abstraction

Hardware

NUCLEO-F446RE

NUCLEO-F746ZG

X-NUCLEO-CCA01M1

X-NUCLEO-CCA02M2

STM32 USB Device

Library

AUDIO IN OUT

USB Class

STM32 Acoustic EC

Library

STM32 PDM Library

STM32F446RET6U

STM32F746ZGT6U

Features

• Specific example fully focused on acoustic echo cancellation

• Implementation of a USB smart speaker use case with microphone

• Based on STM32 AcousticEC library

• Support for audio in/out streaming via USB through a dedicated USB AUDIO IN

OUT class

Description

FP-AUD-AEC1 is an STM32Cube function pack which features an example fully

focused on acoustic echo cancellation and provides an implementation of a USB

smart speaker use case with microphone.

The package includes the AcousticEC library which provides an implementation

for a real-time echo cancellation routine based on the MDF algorithm SPEEX

implementation.

The function pack also includes an implementation example for NUCLEO-F446RE

or NUCLEO-F746ZG development boards equipped with 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 digital MEMS microphones and designed around MP34DT06J digital

microphones.

After the initialization of all the required elements, the device is recognized by a host

PC as a USB microphone and USB speaker at the same time.

You can record and save the real-time audio streaming and, in the meanwhile, send

the preferred audio signal to the loudspeaker connected to the expansion board. The

stereo track contains the processed signal in which the acoustic echo cancellation

has removed the far-end signal from the audio acquired by a microphone and an

omnidirectional microphone as a reference.

Product summary

STM32Cube function

pack for acoustic echo

cancellation

FP-AUD-AEC1

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

MEMS audio sensor

omnidirectional stereo

digital microphone

MP34DT06J

Applications

Speakers

Sound Sensing

STM32Cube function pack for acoustic echo cancellation

FP-AUD-AEC1

Data brief

DB4393 - Rev 1 - January 2021

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

1.3 How does this function pack complement STM32Cube?

This software is based on the STM32CubeHAL. It extends STM32Cube by providing a board support package

(BSP) for the MEMS microphone expansion board and some middleware components for PDM to PCM

conversion, acoustic echo cancellation and USB communication with a PC.

The drivers abstract low-level details of the hardware and allow the middleware components and applications to

access audio data in a hardware-independent manner.

The package also includes a sample application that developers can use to start experimenting with the code.

The sample application has been developed to enable device recognition as a standard USB microphone and

speaker on a PC.

Any freeware or commercial audio recording and player software can be used.

FP-AUD-AEC1

Detailed description

DB4393 - Rev 1

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