Meeting Room System

Overview

The Electronics area has a teleconferencing system installed in it. Very roughly, it consists of a Shure ceiling microphone, Biamp digital signal processor (DSP), Logitech Rally camera, and other assorted accessories. This provides a high-quality camera and microphone available over USB to a dedicated computer used for video conferencing. This system is platform-agnostic, so it can be used with Discord, Zoom, Teams, Webex, etc.

PoC for design/troubleshooting: Natalie Moore

Diagram

[TBD]

Audio

Ceiling Microphone

The ceiling microphone is a Shure MXA910. It provides 8 individual lobes available via Dante, powered by PoE. It has two separate IPs, one for the Dante audio stream and one for control/management; however they both ride over the one Ethernet connection to the switch.

• Control IP: 10.100.15.6 [VERIFY AFTER CX]
• Dante IP: 10.100.15.7 [VERIFY AFTER CX]
• Switchport: [TBD AFTER CX]

Digital Signal Processor

A Biamp Tesira Server-IO is used as the DSP. It provides various effects and processing to the incoming audio streams, and combines them for the main output to the conferencing computer.

The Tesira has two discrete network connections - one for Dante, and one for control. Unlike the ceiling mic, they are on separate RJ-45 connectors.

• Control IP: 10.100.16.5 / switchport XX [VERIFY AFTER CX]
• Dante IP: 10.100.15.5 / switchport XX [VERIFY AFTER CX]

DSP file can be found at [PROVIDE AFTER CX]

Effects

The DSP provides:

• EQ and compression for all 8 ceiling microphone lobes
• Acoustic echo cancellation (AEC) for all incoming microphones. This will "subtract" the audio getting sent through the speakers in the room from the microphones to prevent remote participants from hearing themselves speak through the room.
• Gated mixer to only allow up to two microphone lobes to be activated at once (possible # lobes active == [0-2]). Only lobes with a strong enough signal will be allowed in.

Connections

The audio connections on the rear of the Tesira follow a standard color code. Green is audio input, orange is AEC input, and black is audio output.

• Port 1: AEC Ref L (from projector)
• Port 2: AEC Ref R (from projector)
• Ports 3-8: Reserved (internal acoustic echo cancellation engine is used for ceiling microphone)
• Ports 9-x: Unused
• Port x: To PC L [VERIFY AFTER CX]
• Port x: To PC R [VERIFY AFTER CX]

Video

Camera/video is provided by a Logitech Rally camera using the Logitech power/data combiner (12v power + USB 3 over USB-C).

Computer

TBD.