Overview and Features:

•  Espressif Systems ESP32-LyraTD-DSPG Audio Development Board is based on the ESP32 MCU and DBMD5P DSP. It supports connection to Amazon’s AVS (Alexa Voice Service), Google's Dialogflow, and Google's GVA (Google Voice Assistant).

• The ESP32-LyraTD-DSPG is based on ESP32-WROVER-B, a BT/Wi-Fi combo module, and a digital signal processor (DSP). The DSP features a three-microphone array for noise reduction, echo cancellation, beamforming, and wake-word detection. The ESP32-LyraTD-DSPG is integrated with peripheral devices and consists of two development boards. 
• More information: Espressif Systems ESP32-LyraTD-DSPG Audio Development Board is based on the ESP32 MCU and DBMD5P DSP. Custom voice-interactive products can also be built with this solution by using ESP-VA-SDK (Espressif’s voice assistant SDK) and ESP-ADF (Espressif Audio Development Framework).

Parameters:

Board Details:

• USB power input:

Provides power supply to the whole system. It is recommended that the system be connected to a power adapter for sufficient current supply.

• ESP32-WROVER-B module:

This is a powerful, general-purpose, Wi-Fi+BT+BLE dual core MCU module, targeting a wide variety of applications ranging from low-power sensor networks to the most demanding tasks, such as voice encoding/decoding, music streaming and runs voice assistant client SDK.

• DBMD5P DSP:

DBMD5P is a dual core, programmable voice processor which supports various functionalities such as voice trigger (VT), voice commands, voice authentication (VA), acoustic echo cancellation (AEC). This audio DSP is used for wake-word detection. It captures audio data from an external array of three digital microphones.

• Audio codec:

E8388 audio codec is used for digital audio conversion to analog audio output.

Audio amplifier:This audio power amplifier sends audio signals from the Codec to external speakers for playback.

• CP2102N USB-to-UART Chip:

An upgraded version of the CP2102 chip supports USB-to-UART conversion.

• USB Port:

This is a normal USB communication port between PC and the main board.

• Earphone Connector:

Used for plugging in earphones/headphone. Audio output is via Codec.

• Speaker Connector:

Supports one external speaker output via Power Amplifier.

• FPC connector:

This connection is used for connecting external sub board consisting of microphone array, buttons and LEDs via flex cable.

• Mini Din connector:

This connection can be used for connecting the microphone cable, if there is such a requirement. By default, this connector is not mounted on the main board.

• Sub board:

Sub board consists of LEDs and LED driver along with function keys and Mic array connected via FPC cable.

References:

• ESP32 Datasheet
• ESP32-WROVER-B Datasheet
  
• Documents