ICSI's Meeting Recorder Audio Setup

This page describes the actual hardware setup used to collect the meeting recorder data at ICSI. The equipment is installed in conference room 6A, which has a small machine room at the rear. Most of the equipment is in the machine room, with the cables from the microphones coming down from the conference table and through a hole in the intervening wall. The overall block diagram is shown below:

The equipment we have used is:

• Wireless microphones: Sony ECM-310BMP headsets and a Sony ECM-77BMP lapel mic feeding into Sony WRT-805A body pack transmitters.
• Wireless receiver: Sony MB-806A modular base unit containing five Sony WRU-806A/64 UHF synthesized tuner modules.
• Analog-to-digital converters: Two Sonorus AUDI/O AD/24 8 channel 24 bit 44/48kHz optical-output converters, connected to a Sonorus STUDI/O 16 channel digital audio PCI bus interface, mounted in a Dell 500 MHz Pentium III PC running Red Hat Linux 6.1.
• Ambient mics: Four Crown PZM-6D pressure zone microphones.
• Home-made dummy PDA with two cheap electret elements mounted about 8cm apart.
• In-house-manufactured bias power/amplifier/line driver to interface conventional computer headsets with pro-audio XLR inputs.

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