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1.
ESP32-LyraTD-MSC, one of Espressif's Audio Development Boards, is an Acoustic Echo
Cancelation (AEC) solution supporting voice recognition, near-field and far-field voice wake-
up. Audio files in the format of AAC, FLAC, OPUS and OGG can be decoded and output
without quality loss. It also supports connection to Baidu's DuerOS and Amazon's AVS
(Alexa Voice Service) .
1.1. ESP32-LyraTD-MSC
ESP32-LyraTD-MSC is based on ESP32-WROVER, a BT/Wi-Fi combo module, and a
digital signal processor (DSP) that features a three-microphone array for noise reduction,
echo cancelation, etc.ESP32-LyraTD-MSC is integrated with peripheral devices and
consists of two development boards. The upper board mainly consists of the microphone
array, function keys and LED lights. The lower board is integrated with power management,
Wi-Fi and audio modules.
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Espressif
USB power input
Battery Interface
Power switch
I
2
S port
USB
Communication Port
Programming port
CP2102N
USB-UART Chip
JTAG port
Micro SD card
Micro SD card slot
Figure 1-1. ESP32-LyraTD-MSC
ESP32-WROVER module
MicroSemi DSP
I
2
C SPI port
Ear phone jack
Dual speaker
output ports
Audio driver
DC / DC boost
power supply
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1. Overview
Overview
2018.07
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