Behler G.

Bjørnø L.

Finn Jacobsen

Juhl P. M.

Knud Rasmussen

Salvador Barrera-Figueroa

Skvor Z.

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The acoustic center of laboratory standard microphones

Barrera Figueroa, Salvador

Rasmussen, Knud

Jacobsen, Finn

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 17, 2017The acoustic center  of laboratory standard  microphones (vol 120, pg 2668, 2006)Barrera Figueroa, Salvador; Rasmussen, Knud; Jacobsen, FinnPublished in:Acoustical Society of America. JournalLink to article, DOI:10.1121/1.2427116Publication date:2007Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Barrera Figueroa, S., Rasmussen, K., & Jacobsen, F. (2007). The acoustic center  of laboratory standardmicrophones (vol 120, pg 2668, 2006). Acoustical Society of America. Journal, 121(2), 1248-1248. DOI:10.1121/1.2427116Erratum: “The acoustic center of laboratory standardmicrophones” [J. Acoust. Soc. Am. 120(5), 2668–2675 (2006)]Salvador Barrera-Figueroaa and Knud RasmussenbDanish Primary Laboratory for Acoustics, Danish Institute for Fundamental Metrology, MatematiktorvetB307, DK-2800 Lyngby, DenmarkFinn JacobsencAcoustic Technology, Ørsted•DTU, Technical University of Denmark, Ørsteds Plads B352, DK-2800 Lyngby,DenmarkReceived 22 November 2006; accepted 25 November 2006DOI: 10.1121/1.2427116PACS numbers: 43.38.Kb, 43.58.Vb, 43.20.Rz, 43.10.Vx AJZThere is an error in one of the coefficients in Table I, corrected in the revised table below.Alternatively, a slightly different polynomial approximation based on more data can be used. The coefficients of thealternative polynomial approximation are given in Table II.aElectronic mail: sbf@oersted.dtu.dkbElectronic mail: kr@oersted.dtu.dkcElectronic mail: fja@oersted.dtu.dkTABLE I. Coefficients of the polynomial approximation of the acoustic center.LS1 Coeff. LS210.8 a0 4.6−2.32 a1 −0.130.317 a2 −0.052−0.0268 a3 0.00550.0011 a4 −0.000224−1.64e–5 a5 3.993e–6- - - a6 −2.573e–8TABLE II. Alternative coefficients of the polynomial approximation of the acoustic center.LS1 Coeff. LS210.08 a0 4.59−1.302 a1 −0.115−0.0375 a2 −0.05420.02676 a3 0.005678−0.002792 a4 −0.00023270.00011735 a5 4.215e–6−1.744e–6 a6 −2.78e–81248 J. Acoust. Soc. Am. 121 2, February 2007 © 2007 American Institute of Physics0001-4966/2007/1212/1248/1/$23.00Downloaded 29 Jun 2010 to 192.38.67.112. Redistribution subject to ASA license or copyright; see http://asadl.org/journals/doc/ASALIB-home/info/terms.jsp

The acoustic center of laboratory standard microphones (vol 120, pg 2668, 2006)

An experimental procedure is described for obtaining the effective acoustic distance between pairs of microphones coupled by a free field, leading to the determination of the position of the acoustic center of the microphones. The procedure, which is based on measuring the modulus of the electrical transfer impedance, has been applied to a large number of microphones. In all cases effects due to reflections from the walls of the anechoic chamber and the interference between the microphones have been removed using a time-selective technique. The procedure of determining the position of the acoustic center from the inverse distance law is analyzed. Experimental values of the acoustic center of laboratory standard microphones are presented, and numerical results obtained using the boundary element method supplement the experimental data. Estimated uncertainties are also presented. The results reported confirm values previously defined in an international standard and extend the frequency range

Erratum: “The acoustic center of laboratory standard microphones” [J. Acoust. Soc. Am. 120(5), 2668–2675 (2006)]

http://orbit.dtu.dk/ws/files/4455243/Jacobsen.pdf

The acoustic center of laboratory standard microphones

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