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This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
(a) A comparison of the output signal of the reference microphones and the ElGoFET microphone with acoustic signals generated from the loudspeaker; and (b) the frequency response of the ElGoFET microphone compared with that of the reference microphone in dB units relative to 1V/Pa.