Absolut-Bestimmung des Ubertragungsfaktors von Mikraphonen im diffusen Schallfeld
With the aid of Schottky's relationship between the action of a transducer as a microphone and as a loudspeaker in free space it is possible to deduce the reciprocity parameter for the diffuse sound field of a chamber with volume V and reverberation time T as Jd ≈ (2.1/ϱ0 f) (V/c T)1/2 (f frequency, ϱ0 mean air density, c sound velocity). Knowing the reciprocity parameter, it is possible to derive the diffuse-field response of a microphone in absolute measure from electrical measurements in the chamber. The apparatus for doing this is described and, as an example, the diffuse-field calibration curve of a condenser microphone in the range 500 to 16 000 c/s is given.
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Document Type: Research Article
Publication date: January 1, 1960
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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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