Overview
========
The maestro_demo application demonstrates audio processing on the ARM cortex core
utilizing the Maestro Audio Framework library.
Depending on target platform there are different features of the demo enabled.
- loopback from microphone to speaker
- recording microphone to a file
- wake words + voice commands recognition
The application is controlled by commands from a shell interface using serial console.
Type "help" to see the command list. Similar description will be displayed on serial console:
>> help
"help": List all the registered commands
"exit": Exit program
"version": Display component versions
"record_mic": Record MIC audio and either:
- perform voice recognition (VIT)
- playback on WM8904 codec
- store samples to file.
USAGE: record_mic [audio|file|vit] 20 [en|cn]
The number defines length of recording in seconds.
For voice recognition say supported WakeWord and in 3s frame supported command.
Please note that this VIT demo is near-field and uses 1 on-board microphone.
NOTE: this command returns to shell after record finished.
For custom VIT model generation (defining own wake words and voice commands) please use https://vit.nxp.com/
Toolchain supported
===================
- IAR embedded Workbench 9.30.1
- GCC ARM Embedded 10.3.1
- MCUXpresso 11.6.0
Hardware requirements
=====================
- Micro USB cable
- JTAG/SWD debugger
- EVKB-IMXRT1050 board
- Personal Computer
- Headphones with 3.5 mm stereo jack
Board settings
==============
Please insert a SDCARD into card slot(J20)
Prepare the Demo
================
1. Connect a micro USB cable between the PC host and the debug USB port (J41) on the board
2. Open a serial terminal with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
3. Download the program to the target board.
4. Connect the headphones into the headphone jack on EVKB-MIMXRT1050 board (J12).
5. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Note:
There is limited RAM on this platform, which brings following limitations:
- VIT is not enabled
Running the demo
================
When the example runs successfully, you should see similar output on the serial terminal as below:
**********************************
Maestro audio solutions demo start
**********************************
[APP_SDCARD_Task] start
[APP_Shell_Task] start
SHELL build: Nov 5 2020
Copyright 2020 NXP
>> [APP_SDCARD_Task] SD card drive mounted
Yilin Sun
ded8674389
