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, and identify surfaces causing problematic rays. The graphical nature of the IRIS plot enables easy comparison between different seats in a room.
Magnitude, direction and time information may be obtained for a comprehensive analysis of individual rays. A standard impulse response waveform is provided, and the timing of individual sound rays from the IRIS plot may be identified in this view.
The IRIS measurement system uses a compact tetrahedral microphone array. The four channel signal is carried by a single cable to a USB audio interface. All information including level, direction and time is captured with a single sine sweep recording. The system has been designed by practising acousticians for reliable and efficient measurements in real-world situations.