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QuickFeather Alexa Close-Talk Ref Design

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QuickLogic Smart Hearable Reference Design for Voice-Initiated, Hands-Free, Alexa Built-In Devices with Close-Talk Support

This reference design can be used by manufacturers to evaluate the “Alexa User Experience” and build Proofs-of-Concept.

This is the first available always-listening, Close-Talk qualified smart hearable reference design based on QuickLogic’s ultra-low power Arm® Cortex®- M4 Microcontroller. This reference design can be used by manufacturers to evaluate the “Alexa” Built-In Close-Talk experience, optimized for battery-powered products.

It is based on QuickLogic’s Open Reconfigurable Computing (QORC) Initiative, EOS™ S3 Voice Processor, and QuickLogic’s QuickFeather open source development kit, enabling superior user experience and long battery life. The EOS S3 integrates Sensory’s Low Power Sound Detection (LPSD) technology, and runs DSP Concepts’ TalkTo noise suppression and beamforming technology.

In addition to enabling an intuitive “Alexa” Built-In voice experience, manufacturers can integrate motion, sound and other Artificial Intelligence (AI) and Machine Learning (ML) use cases based SensiML’s AI Software Platform that already supports QuickLogic’s QuickFeather development kit

Following evaluation with this reference design, manufacturers can take the next step in product development based on the same QuickFeather development kit or design their own hardware.


  • Proven development kit that has passed Amazon certification for Close Talk dev kits
  • Alexa Close-Talk Hearable and Wearable products
  • Supported by 100% open development source tools


  • With a Cortex®-M4F MCU and integrated eFPGA, the onboard EOS S3 voice processor and various sensors lets you innovate new use cases and user experiences


Alexa Wake Word Engine (WWE) running in the EOS S3 voice processor
Hardware-optimized Low Power Sound Detection (LPSD) technology from Sensory™
Support for one or two microphone use cases with DSP Concepts’ TalkTo noise suppression and beam forming technology
Connectivity to Alexa Voice Service via Wi-Fi
Built on top of 100% open source hardware QuickFeather dev kit and QORC open source software tools

 The reference design includes

QuickLogic QuickFeather Development Kit including the EOS S3 Low Power Voice Processor - Supported by 100% Open Source Hardware Development Kit and Software Tools
Espressif ESP32-WROVER-E WiFi Development Kit for WiFi connectivity
Adafruit I2S Audio Decoder for supporting playback from Alexa Voice Service directly to a standalone speaker
QuickLogic microphone daughtercard that supports variable microphone spacing
QuickLogic sturdy PCB cradle to reliably connect all components together
For more information, please visit the development kits for AVS page under Headphone / Headset Dev Kits section.


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