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IRIS 3D Acoustic Impulse Response Measurement & Visualization

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IRIS 3D SystemIRIS Introduction to 3D Audio

3D Acoustic Impulse Response – Measurement & Visualization

IRIS is a room acoustics measurement system developed by Marshall Day Acoustics in New Zealand. It was released at the beginning of 2014 as a fully integrated hardware and software system for making 3D impulse response measurements. IRIS is a powerful and user friendly measurement system for capturing and analyzing room impulse responses in 3D.

IRIS v2 is now available with or without a hardware measurement kt and the software comes in various forms depending on your requirements.

IRIS Features

  • 3D impulse response measurements visualized in an intuitive way which enables you to link the perception of sound to the architectural form of the space being tested.
  • Measurements of room acoustic parameters according to ISO 3382-1:20091 and ISO 3382-2:20082
  • Sound strength calibration and measurement (with both 3D or mono microphones)
  • Lateral fraction measurement when using a 3D microphone array
  • Speech Transmission Index measurements according to IEC 60268-16:2011
  • Open plan office measurements according to ISO 3382-3:2012
  • Automatic source-receiver distance calculation
  • Import and export the impulse response data in various formats

The IRIS plot is at the heart of the IRIS system. Sound rays arriving at the measurement position are represented as a series of easy to identify coloured spikes, immediately after the measurement is conducted.

The IRIS plot can be used to relate sound rays to physical features of the room, observe the directional distribution of early and late sound energy, as well as identify surfaces causing problematic reflections.
It’s simple to understand:

  • the spike direction tells you where the ray has come from (rotation and elevation angle)
  • the spike length tells you the strength of the ray (dB level relative to the initial incoming sound ray level)
  • the spike colour tells you when the reflected sound arrived at the microphone (see color coding based on assessment – Music, Speech,..)

IRIS Software Types

IRIS software is available in various forms:

  • IRIS 3D

    This is the full version of IRIS which can record and analyze 3D and mono impulse response measurements.

  • IRIS Solo

    IRIS Solo can only conduct mono impulse response measurements. Recording, importing and exporting 3D impulse response measurements is disabled.

  • Open Plan Office Module

    Both IRIS 3D and IRIS Mono can be extended with the Open Plan Office Module for making measurements according to ISO 3382-3:2012.

  • Academic or Student License

The IRIS demo software allows the review of IRIS measurements.  Please unzip the download.  Install the software (setup.exe) and copy the Example Project to your system. Start IRIS and open the project. 

IRIS Kit – Measurement Hardware

An IRIS Kit is a collection of hardware delivered in a Pelican case. It includes the receiver, audio interface and the necessary cabling and adapters, but not a source

There are three official types of IRIS hardware kits:

  • Rev 3 released in 2020 ( link )
  • Rev 2, released and discontinued in 2019
  • Rev 1 produced from 2014 to 2018

A fully assembled and tested Revision 3 system may be purchased directly, or you can buy the individual components yourself.

Additional Equipment

In addition to one of the IRIS kits above, you must provide the following equipment:

  • Laptop computer  (Windows 10 64 bit is recommended, Rev 3 Kits require 1x USB port and an Ethernet connection, Rev 1 & 2 Kit require 2x USB 2.0 or newer ports, 4+GB of RAM, Intel i5 or i7 CPU (minimum of 2 cores) 
  • Microphone stand
  • Source loudspeaker, power amplifier and necessary cabling 
  • AC power extension leads
  • Headphones for monitoring microphone signals
  • Paper and pen
  • Tape measure
  • Electrical insulation tape (can be useful for attaching things to the mic stand, or marking source and receiver positions)
  • Hearing protection
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