- IRIS is an affordable software and hardware 3D impulse response measurement system
- The system consists of:
- IRIS Software and USB dongle
- Core Sound TetraMic
- MOTU 4pre USB audio interface
- Custom phantom power and microphone cable adapters
- 30 metre CAT5E STP microphone array extension cable
- Pelican Storm case with custom foam cut-out
(Note: The user must provide their own source loudspeaker which fulfils the directivity requirements as specified by ISO 3382:2009-1.)
- Simple and user friendly setup and measurement process
- All data is gathered in a single exponential sine sweep recording
- Default settings suitable for most measurement situations with advanced options available.
- 3D colour-coded representation of sound rays
- Length indicates relative sound intensity level, angle is the ray direction, and colour represents time of arrival
- Separate music, speech and studio (small room) arrival time categories
- Interactive 3D rotation and zoom
- Dynamic range and time resolution adjustment
- Specific angle, level and time information for individual rays for a detailed analysis
- Broadband, octave band and other filtered views
- Traditional omnidirectional waveform views
- Dynamic interaction between the IRIS plot and waveform view – rays selected in one view are highlighted in the other view
- Automatic detection of onset time with manual adjustment
- Standard acoustic parameters are displayed in table and graph form
- EDT, T20, T30, G, G Early, G Late, LF, LFC, GLL, D50, C50, C80, Ts, ST Early and ST Late are calculated in octave bands in accordance with ISO 3382-1:2009
- (Coming soon) Facility to calibrate sound sources in a diffuse field or free field for sound strength measurement (G, G Early, G Late and GLL)
- LF measurement is very simple and practical - the system is pre-calibrated and automatically aligns a virtual figure-of-8 microphone in post-processing. Click here for information about how LF measurement was validated.
- Tables can be saved to clipboard or exported as a spreadsheet
The operation and configuration of IRIS is effortless...
Sebastià V. Amengual Garí
The success of a musical performance depends on the sense of proximity of performer to listener. This sense is mediated largely by the directional properties of the reflected sound field.
Sir Harold Marshall
I regard the acoustic designs of Marshall Day Acoustics to be amongst the finest and probably the most innovative in the world.
Dr Anders Gade, Technical University of Denmark