Fluent.ai Far-Field Voice UI

Capture and process voice in the noisiest environments with the cost-effective STM32H747I MCU. Powered by Alexa-qualified TalkTo, this reference design brings far-field Voice UI with intent recognition to home automation devices.


  • Far-field (3 m) voice activation with high response accuracy rate
    • DSP Concepts’ high-performance TalkTo Audio Front-end
    • Local commands with intent recognition
  • Cost-effective BOM for small form-factor products
  • Runs on single low-cost STM32H747I microcontroller
  • No external memory required
  • Automatic Intent Recognition with support for multiple languages and accents

Audio Front-end Features

  • DSP Concepts’ TalkTo provides reliable far-field performance in noisy environments
    • 2-mic array
    • Single-Channel Noise Reduction (SCNR)
    • State-of-the-art noise cancellation with Adaptive Interference Canceller (AIC)
      • No reference signal needed
      • Eliminates 30 dB of directional interfering noise
  • Fluent.ai “Alexa” Wake Word model
  • Fluent.ai Automatic Intent Recognition (Air) model
    • Speech-to-intent recognition model
    • Support for approximately 50 commands
    • Support for multiple languages and accents
      • English (North American accent)
      • English (Mainland Chinese accent)
      • Mandarin (Mainland Chinese accent)

Software Integrations

  • Audio Weaver Designer: Drag-and-drop graphical tool to customize and tune audio processing models in real-time with 500+ modules
  • Audio Weaver Core: Embedded audio processing engine for the ARM Cortex-M7
  • TalkTo Voice UI: Adaptive interference cancellation and advanced beam-forming signal processing for far-field command recognition

Hardware Specifications

  • Processor
    • STM32H747I XIH6 Dual Core MCU with Arm® Cortex®-M7 @ 480 MHz and Arm® Cortex®-M4 @ 240 MHz
  • Memory
    • 2028kB Flash
    • 1024kB RAM
  • Audio I/O
    • SAI audio codec
    • 2-channel USB audio I/O
    • 4-channel microphone input
  • Board connectors
    • USB with Micro-AB

Included with the demo kit:

  • Available from Fluent.ai
  • Includes STM32H747I Discovery Kit with STM32H747 MCU and pre-flashed demo firmware
  • DSP Concepts 4-mic array daughter board with 2 mics enabled
  • Voice UI Quickstart Bundle available upon request: Everything you need to know to design voice-enabled IoT products, including design guidelines,microphone placement, an Audio Weaver Designer layout (.AWD), and tools to get started.
  • USB cable
  • AC-powered stereo speakers with volume control and integrated audio cable

Ready to get started?

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