Acoustic Noise in Condenser Microphones

Authors: Becker, Volker; Engel, Andreas; Breitlow, Jürgen

Source: Acta Acustica united with Acustica, Volume 92, Number 1, January/February 2006 , pp. 127-134(8)

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Abstract:

A theoretical framework is proposed to calculate the contribution to the noise level of a condenser microphone originating from thermal fluctuations of the diaphragm. To this end a mechanical model for the diaphragm dynamics is introduced that allows to include contributions from several vibration modes. Determining the intensities of equilibrium fluctuations of these modes from the fluctuation-dissipation theorem of equilibrium statistical mechanics the spectral decomposition of the acoustic noise in the microphone output can be determined. The results are found to be in good agreement with experimental investigations.

Document Type: Research article

Publication date: 2006-01-01

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Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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Acoustic Noise in Condenser Microphones

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