To identify the best approach, Brüel & Kjær carried out an investigation contrasting five methods for the reproduction of background noise, including ETSI EG 202 396-1, Higher-order ambisonics, matrix inversion method, ETSI TS 103 224 and matrix inversion method optimised for a specific device.
For each method, the quality of the reproduced sound was evaluated both objectively and subjectively, at microphones close to a device under test and at the ears of a Head And Torso Simulator (HATS).
A listening experiment evaluated the perceived quality of the sounds at points where telecommunication devices would typically be placed, around the head.
Following the experiment, the matrix inversion method – optimised for specific microphone positions, such as kdev/kbin – proved to perform the best, both in the objective and the subjective analysis.
The full paper is available to read on Brüel & Kjær’s website: http://www.bksv.com/doc/bn1685.pdf?r=http://www.bksv.com/Library/Conference%20Papers