TalkTo for ST: Kiosk

Capture and process voice in the noisiest environments with the cost-effective STM32H747 MCU. Powered by Alexa qualified TalkTo, this reference design brings near-field Voice UI and transcription applications to QSR and retail kiosks, with local and cloud command recognition.


  • Near-field voice activation
    • DSP Concepts’ high performance TalkTo Audio Front-end 
  • Local or cloud command recognition
  • Cost-effective BOM for small form-factor products
    • Runs on single low-cost STM32H7 micro-controller 
    • No external memory required
  • Integrated loudspeaker processing for Kiosks that support internal speakers

Audio Front-end Features

  • DSP Concepts’ TalkTo provides reliable far-field performance in noisy environments
    • 2-mic fixed beam Beamformer with Single Channel Noise Reduction (SCNR)
    • 30+ dB Acoustic Echo Cancellation (AEC) to cancel out speaker prompts from the kiosks
  • Support speaker output with integrated playback processing

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 for ST Voice: Embedded audio processing engine for Cortex-M7
  • TalkTo Voice UI: Echo cancellation and advanced beam-forming signal processing for near-field command recognition

Hardware Specifications

  • Processor
    • STM32H747XIH6 MCU with Dual Core Arm®Cortex®-M7 running at 480MHz and Arm® Cortex®-M4 running at 240MHz
  • Memory
    • 2048kB Flash
    • 1024kB RAM
  • Audio I/O
    • SAI audio codec
  • Board connectors
    • Camera ( 8-bit)
    • USB with Micro-AB
    • Ethernet RJ45
    • SPDIF RCA input and output
    • Stereo headset jack including analog microphone input
    • audio jack for external speakers
    • microSD card
    • TAG-connect 10-pin footprint
    • Arm Cortex 10-pin 1.27 mm-pitch debug connector over STDC14 footprint
  • Board expansion options
    • Audio daughter board 
    • Arduino™ Uno V3,
    • Pmod™ Type 2A and Type 4A
    • STMod+

Included with the demo kit:

  • STM32H747I Discovery Kit with STM32H747 MCU
  • DSP Concepts 4 mic array daughter board with selectable 2-mic configuration
  • Voice UI Quickstart Bundle: 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

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