Synthesis of Room Impulse Responses for Variable Source Characteristics
DOI:
https://doi.org/10.14311/1444Keywords:
spherical harmonics, adjustable source directivity, room impulse response, linear room acousticsAbstract
Every acoustic source, e.g. a speaker, a musical instrument or a loudspeaker, generally has a frequency dependent characteristic radiation pattern, which is preeminent at higher frequencies. Room acoustic measurements nowadays only account for omnidirectional source characteristics. This motivates a measurement method that is capable of obtaining room impulse responses for these specific radiation patterns by using a superposition approach of several measurements with technically well-defined sound sources. We propose a method based on measurements with a 12-channel independentlydriven dodecahedron loudspeaker array rotated by an automatically controlled turntable.Radiation patterns can be efficiently described with the use of spherical harmonics representation. We propose a method that uses this representation for the spherical loudspeaker array used for the measurements and the target radiation pattern to be used for the synthesis.We show validating results for a deterministic test sound source inside in a small lecture hall.Downloads
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Published
2011-01-05
How to Cite
Kunkemoeller, M., Dietrich, P., & Pollow, M. (2011). Synthesis of Room Impulse Responses for Variable Source Characteristics. Acta Polytechnica, 51(5). https://doi.org/10.14311/1444
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