A Method for Demonstrating the Linearity of Measurement Microphones at High Sound Pressures
This paper outlines a method for demonstrating the linearity and flatness of response of measurement microphones relative to one another at high sound pressure levels in the range 115 to 150 dB re 20 Pa and over the frequency range 63 Hz to 4 kHz. Results are given for three working standard microphones, all of which show linearity with sound pressure and a flat frequency response over the whole range. A fourth working standard microphone was also tested using the system and was shown to have a non-linear response, due mainly to harmonic distortion at particular frequencies. This non-linearity was within the manufacturer's tolerances, and showed a similar drop-off in sensitivity to that found in earlier tests performed using another calibration method . In conclusion, this method may be used to obtain data on the frequency characteristics of a microphone at high sound pressure levels in the low to mid frequency range, where other methods may not give enough information, be impractical, or even impossible.
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Document Type: Research Article
Publication date: November 1, 1998
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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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