Samsung contracted Amatek to develop an interactive in-store demonstration system that allowed visitors to experience Samsung's range of precision home audio products.

This project built on our successful record of developing LIPD (Low Interference Potential Devices) radio communications for applications as diverse as key finders, remote sensors and remote meter monitoring systems.


The purpose of the system was to play demo music on a multiple speaker audio system using an Android Application in a retail environment.

The system required audio controller which would connect to an Android device using the Android Open Accessory Protocol.

Design Challenges
  • Overall system reliability.
  • Reliable communications with an Android device.
  • Support for Hi-FI audio quality.
  • Communication to Android devices over USB Real-time Audio Stream to multiple devices.
  • Reliable system testing.

Key System Elements

  • STM32F105 ARM® CortexT - M Microcontroller.
  • Analogue Device DSP.
  • Android USB Open Accessory Mode Interface.
  • I²C Audio Multiplexer.
  • SPI Communications.

System Logic

Audio Controller Logic