Abstract
An upgraded version of a previously described acoustic isolation vessel [K. C. T. Ngo and A. J. Zuckerwar, J. Acoust. Soc. Am. 93, 2974–2980 (1993)] has been used to investigate the background noise in piezoresistive and electret condenser microphones over the frequency range 1 Hz–100 kHz. The test microphones represent four different manufacturers. Theoretical models for predicting the noise characteristics of piezoresistive (nonreciprocal) and electret condenser (reciprocal) microphones are proposed. In particular, the results of 1/f noise measurements on these microphones are compared with those previously obtained from air condenser microphones.
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