- IRIS 3D
- IRIS Solo
- Room Acoustic Parameters
- Speech Intelligibility
- Open Plan Office Measurements
- Hardware Kit
- Microphone Array Support
IRIS 3D
IRIS 3D records and visualises 3D impulse responses of rooms in an intuitive way:
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Observe the directional distribution of early and late sound energy
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Identify specific acoustic events in level, time and direction
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Link the perception of sound to the architectural form
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Interaction between the 3D ‘IRIS Plot’ and waveform view
IRIS Solo
IRIS also functions as a very capable mono impulse response measurement system. All non-3D features are available:
- Non-spatial room acoustic parameters, including sound strength calibration and measurement
- Speech intelligibility
- Open plan office measurements (with the optional module)
Room Acoustic Parameters
The room acoustic parameters from ISO 3382-1 and ISO 3382-2 are calculated in octave bands and displayed in chart and table forms:
- Decay Range (a measure of the signal-to-noise ratio)
- Reverberation Time (EDT, T20, T30)
- Linearity of decay curve parameters (ζT20, ζT30, Curvature)
- Sound Strength (G, GEarly, GLate)
- Spatial Parameters (LF, LFC and GLL)
- Clarity (C50, C80, D50, Ts)
- Stage Parameters (STEarly, STLate)
For more details, see this page.
Speech Intelligibility
IRIS calculates the Speech Transmission Index (STI) according to IEC 60268-16, as well as Useful-to-Detrimental Ratios.
- Full STI calculated according to the indirect method
- Three STI metrics are presented: STI Male, STI Female and STIPA (IR)
- Evaluate STI/U with multiple and speech and noise conditions for a single measurement
Open Plan Office Measurements
IRIS can come equipped with a powerful set of tools for Open Plan Office measurements, following ISO 3382-3 and VDI 2569:
- Spatial decay rate (D2,S)
- Level of speech at 4 m from the source (Lp,A,S,4m)
- Distraction distance (rD)
- Privacy distance (rP)
- VDI 2569 room acoustics class
These features are available in the Open Plan Office module, an add-on option to base installations of IRIS for versions 1.4 and higher.
Hardware Kit
IRIS is available with a hardware kit, which includes most of the equipment you need to conduct 3D impulse response measurements:
- Sennheiser AMBEO VR Microphone with an isolated microphone stand clip, basic wind sock and splitter cable with 4x XLR male connectors
- Shure ANI4IN-XLR 4-channel microphone preamplifier
- 30 m STP Cat5e microphone array extension cable
- Dante AVIO 1-channel XLR analog output adapter for source loudspeaker
- Pelican Storm iM2450 with custom foam cut-out
Please see this page for detailed description of the hardware kit.
Microphone Array Support
IRIS supports three popular first order Ambisonic microphone arrays:
- Rode NT-SF1
- Sennheiser AMBEO VR Mic
- Core Sound TetraMic
Direct B-format input (with an external A-format to B-format converter) is also available.
IRIS is certified for use with the Sennheiser AMBEO VR Mic.
What people are saying
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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 -
The operation and configuration of IRIS is effortless...
Sebastià V. Amengual Garí -
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