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VocalFusion stereo-AEC voice processor for Amazon Alexa Voice Service

XMOS high-performance digital signal processing solutions help you build the Amazon Voice Service (AVS) voice interaction service quickly into your products. Our stereo-AEC voice processor gives you up-close voice capture quality and processing accuracy at far-field range – even in noisy environments. Ideal if you want to integrate Alexa into a smart TV, soundbar, set-top box or digital media adaptor.

  • Distance


    Accurate voice capture and barge-in from across the room even when music is playing loudly and the commands are spoken softly.

  • Clarity


    Full duplex stereo-AEC, noise suppression and dereverberation. Cuts out noise and echo for optimised ASR processing.

  • Direction


    With beamforming to track the voice of interest, you’ll get best in class performance at all angles and over long distances.

  • Development Kit



VocalFusion 4-mic stereo-AEC development kit for Amazon AVS

XVF3500 processor board

  • XVF3500 voice processor
  • Micro-USB connector for power (optional USB2.0 device connectivity)
  • Low jitter, audio quality clock
  • Stereo DAC with integrated headphone amplifier
  • 4 configurable user input buttons
  • 13 user-controlled LEDs
  • xTAG interface for JTAG debug

XVF3500 voice processor (programmable for far-field voice capture)

  • Full duplex stereo acoustic echo cancellation (AEC)
  • Programmable AEC latency
  • Barge-in
  • 4 channel digital microphone interface
  • Adaptive beamformer
  • Dereverberation
  • Noise suppression
  • Automatic Gain Control (AGC)
  • Direction of arrival indication (DOA)

Compact microphone array

  • Linear, 100mm long
  • 4 x Infineon IM69D130 PDM (Pulse Density Modulation) MEMS microphones
  • 33.33mm inter-microphone spacing


  • Raspberry Pi header
  • Inter-Integrated Sound (I2S) audio interfaces
  • Inter-Integrated Circuit (I2C) serial or USB control interface
  • High speed USB2.0 compliant
  • Multi-channel USB audio class 1.0
  • 167-pin FBGA package 0.5 pitch


  • Distance

    Document library


The hardware and software listed on this page may be subject to a license agreement - see License Agreements.