Measurement of Microphone Harmonic Distortion using Predistortion Technique
Antonín Novák, Petr Honzík · 2024
Measurement of microphone nonlinear behavior has always been a challenging task due to a lack of linear acoustic sources.A recently developed technique that corrects a distorted output signal of an excitation device using predistortion of its input signal is used in this work.Thanks to this technique, a spectrally clean sinusoidal acoustic pressure is generated inside a closed box in which the microphone under test is placed together with a lowdistortion reference microphone.The goal of this paper is twofold.First, show that the direct measurement of distortion is possible even for high-pressure levels; second, compare the harmonic distortion of several types of microphones such as studio electrostatic and electrodynamic microphones, MEMS microphones and laboratory microphones.