IRIS can make impulse response measurements with a 3D microphone array or a mono microphone.
3D Microphone Array¶
As of version 2.0, IRIS supports the following 3D microphone arrays:
Sennheiser AMBEO VR Mic
Core Sound TetraMic
Each TetraMic is individually calibrated by Core Sound and the resulting calibration document is loaded into IRIS software. Click here for details.
First-order B-format, such as from an Ambisonic microphone array with an external A-format to B-format processor.
- Any single channel microphone, typically omnidirectional (it may be appropriate to use a directional microphone in certain circumstances)
Microphone Extension Cable¶
The receiver will typically need to be extended a long distance from the rest of the measurement equipment. IRIS hardware kits come with a 30 m extension cable as standard.
For transmitting four microphone signals from a 3D microphone array, there are two recommended approaches:
Digitise the four signals close to the microphone array using a Dante-enabled microphone preamp, and run digital signals back to the PC (via a switch) with a long Ethernet cable.
Transmit the four analog signals over a shielded Ethernet cable back to a USB audio interface using a product like the Radial Catapult Mini. The Ethernet cable is not passing digital signals but is being used as an analog snake. A shielded Ethernet cable is required to pass phantom power from the mic preamps in the USB audio interface to the microphone array.
The Core Sound TetraMic has its own cabling solution based on this approach. See the PPAc product here.