Specifications

Status: Released
Version:2.2
Document: ITS-AVS Audio Visual Standards
V2.2Issued.docx
Author: Dean McFadden
Save Date: 25/08/2014
Page 31 of 63
i) The system shall reproduce source and microphone audio.
j) The system is to remain active and reproduce boundary microphone audio when the AV system is
shut down. This is to allow for hearing augmentation when the AV system is not in use.
The AV Integrator must provide a certificate of compliance as per AS1428-2010 for all hearing augmentation
systems.
2.14.6 Induction Loop System
Induction loops must be installed in Lecture spaces and Lectorial spaces. Loops may also be installed in
rooms with a capacity greater than 50 students. These spaces will be assessed by RMIT on a room-by-room
basis and decision criteria must include room use, number and location of adjacent loops.
The AV Integrator must conduct a preliminary survey of the space to ensure that all Standards and Regulation
are met and allowed for prior to the final design of the loop. All loop designs must be issued to the principle for
approval be it is installed.
Loops must be installed below floor coverings using flat copper tape. If loop cannot be installed due to no floor
coverings (e.g. loose laid rugs) or bare concrete floors an alternative solution must be coordinated with RMIT
ITS/AV.
Installed Induction loop systems must be installed in an ‘ultra low loss phased array’ configuration to ensure
that audio from one space cannot leak into adjacent spaces.
Hearing augmentation system must provide 80% coverage of the space with low spill to outside areas unless
otherwise specified.
As a minimum, the assistive hearing loop must meet the following minimum criteria:
a) Field strength inside the area of use must be equal to 400mA/m plus/minus 3dB (tested with
125ms RMS measurement with 1kHz Sine wave)
b) Total variation in signal across the frequency band 100Hz to 5kHz at 1kHz must be within 3dB
anywhere in the loop area
c) Background noise must be less than or equal to -32dB relative to 400mA/m
2.14.7 Infra-Red System
The AV Integrator shall provide a 3-pin XLR wall plate connector for all AV equipped spaces not provided with
a hearing induction loop. The connector shall be clearly labeled and located adjacent a GPO. The AV
Integrator must also ensure that the audio DSP is configured correctly to provide a mixed feed of source and
microphone audio.
The Infra-Red Hearing Augmentation system must include IR transmitters, antennas, IR receiver and room
entrance sign. As a minimum, the IR Hearing Augmentation system must meet the following criteria:
a) IR Hearing Augmentation must provide 95% coverage of the room
b) Multiple transmitters may be required to ensure correct operation for all room configurations
c) Transmitters must not be installed outside or in direct sunlight
d) The number of receivers must correspond to the number of people the space accommodates to
meet BCA regulations.
e) An induction neck loop option must be provided for each receiver supplied
f) Recharger and rechargeable batteries must be provide for each receiver supplied