MOST group demos cost-effective audio mixer

March 25, 2016 // By Christoph Hammerschmidt
During its annual meeting in April, the MOST Cooperation plans to present an audio mixer demo using the coax physical layer. The setup will demonstrate the scaling of MOST150 for entry-level systems.

According to the group that is dedicated to the further development of the Media Oriented Systems Transport (MOST) infotainment data bus system, the audio demo is based on MOST150 coax and includes several microphones and amplifiers. “Thus, we can show that MOST handles multiple audio streams with no audible latency, said Wolfgang Bott, Technical Coordinator of the MOST Cooperation.

MOST-150 Coax Audio Mixer

The demo setup produces high-end 5.1 surround sound and implements a USB application interface. All other nodes are remotely controlled nodes and set up via remote I2C. The central approach simplifies the software development. Another advantage is the low material cost, with only one microcontroller in the entire network and no programming required. According to the MOST Cooperation, this demonstration shows how MOST150 can be very cost effective, by placing all the processing power it needs in a single node and making the other nodes in the system very simple.

The demo setup has six microphones streaming audio signals to the MOST network over six mono channels. The mixer sources two 5.1 streams from an SD Card over 12 mono channels. The mixer then blends all 18 mono channels into one 5.1 stream output to MOST. Three stereo amplifiers render the mixer output to the speakers.

The MOST Forum will take place on April 19, 2016 in Stuttgart/Esslingen (Germany).