Sources of background noise in low-frequency condenser microphones

Sources of background noise in low-frequency condenser microphones

The background noise of a condenser microphone originates from external sources (electromagnetic interference, vibration) and internal sources (self-noise). The leading internal sources include the membrane damping resistance, the polarization voltage resistance (air condenser microphone only), the...

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Veröffentlicht in:The Journal of the Acoustical Society of America 2007-11, Vol.122 (5_Supplement), p.2985-2985
Hauptverfasser: Zuckerwar, Allan J., Shams, Qamar A., Cooper, Jeremy A.
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container_issue 5_Supplement
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container_title The Journal of the Acoustical Society of America
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creator Zuckerwar, Allan J.
Shams, Qamar A.
Cooper, Jeremy A.
description The background noise of a condenser microphone originates from external sources (electromagnetic interference, vibration) and internal sources (self-noise). The leading internal sources include the membrane damping resistance, the polarization voltage resistance (air condenser microphone only), the input resistance to the preamplifier, the capillary vent resistance, and a source of 1/f noise. These sources are modeled in a noise-equivalent circuit, from which an expression for the noise power spectral density is derived. This expression is compared to measurements on a low-frequency electret condenser microphone taken in an acoustic isolation vessel. The capillary vent and 1/f noises vary inversely with frequency and, thus, impact the background noise levels in the infrasonic region.
doi_str_mv 10.1121/1.2942645
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title Sources of background noise in low-frequency condenser microphones
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