On experimental determination of the random-incidence response of microphones

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On experimental determination of the random-incidence response of microphones

Authors
Publisher
Acoustical Society of America
Keywords
  • The Random-Incidence Sensitivity Of A Microphone Is Defined As The Ratio Of The Output Voltage To Th
  • The Random-Incidence Correction Of A Number Of Laboratory Standard Microphones Has Been Determined E
  • Although The Measurement Procedure Seems To Be Straightforward
  • Some Practical And Fundamental Problems Arise: I Reflections From The Mounting Rig Contaminate The M
  • And Whereas Some Of These Reflections Can Be Removed Using A Time-Selective Technique
  • Others Coincide With The Direct Impulse Response And Consequently Cannot Be Removed In The Time Doma
  • Ii The Accuracy Of The Estimate Is Relying On The Rotational Symmetry Of The Microphone And Depends
  • The Effect Of The Angular Resolution Has Been Compared Withthe Analytical Solution Of The Scattering
  • Numerical Calculations Supplement The Experimental Results
  • Although The Procedure Has Only Been Applied To Laboratory Standard Microphones
  • It Is Not Restricted To Such Microphones And May Be Applied To Other Types Of Measurement Microphone

Abstract

On experimental determination of the random-incidence response of microphones - DTU Orbit (05/03/14) On experimental determination of the random-incidence response of microphones - DTU Orbit (05/03/14) On experimental determination of the random-incidence response of microphones The random-incidence sensitivity of a microphone is defined as the ratio of the output voltage to the sound pressure that would exist at the position of the acoustic center of the microphone in the absence of the microphone in a sound field with incident plane waves coming from all directions. The random-incidence correction of a number of laboratory standard microphones has been determined experimentally. Although the measurement procedure seems to be straightforward, some practical and fundamental problems arise: i Reflections from the mounting rig contaminate the measured frequency response, and whereas some of these reflections can be removed using a time-selective technique, others coincide with the direct impulse response and consequently cannot be removed in the time domain and thus affect the accuracy of the estimate; ii the accuracy of the estimate is relying on the rotational symmetry of the microphone and depends on the angular resolution. The effect of the angular resolution has been compared with the analytical solution of the scattering and diffraction around a solid sphere. Numerical calculations supplement the experimental results. Although the procedure has only been applied to laboratory standard microphones, it is not restricted to such microphones and may be applied to other types of measurement microphones. General information State: Published Organisations: Acoustic Technology, Department of Electrical Engineering Authors: Barrera Figueroa, S. (Intern), Rasmussen, K. (Intern), Jacobsen, F. (Intern) Pages: 2628-2636 Publication date: 2007 Main Research Area: Technical/natural sciences Publication information Journal: Journal of the Acoustical Society of America Volume: 121 Journal number: 5

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