The Best Way to Test Phones for Noisy Environments
Recently, Brüel & Kjær, a manufacturer and supplier of sound and vibration measurement systems, investigated simulation methods for the reproduction of background noise to see which best tested phone voice transmission.
An investigation was carried out “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 optimized for a specific device,” according to the company.
“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),” reported Brüel & Kjær, “A listening experiment evaluated the perceived quality of the sounds at points where telecommunication devices would typically be placed, around the head.”
The company concluded that “the matrix inversion method – optimized for specific microphone positions, such as kdev/kbin – proved to perform the best, both in the objective and the subjective analysis.”
To read the full paper, click here.