Low cost omnidirectional sound source utilizing a common directional loudspeaker for impulse response measurementsLow cost omnidirectional sound source utilizing a common directional loudspeaker for impulse response measurements Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2019-06-032018enAlternative low-cost sources (e.g., balloons, gun fires) are used for impulse response measurements when a dodecahedron speaker is not available. This study sets to explore the applicability of a method utilizing a common directional loudspeaker as a sound source. For this purpose measurements were performed in three spaces with three different common directional loudspeakers. Different placements of the loudspeakers were performed (twelve positions similar to the twelve positions of the faces of a dodecahedron speaker, different rotations of the loudspeakers for a total sum of twenty six and fourteen positions). The impulse responses obtained were added up creating a single impulse response for each case. Comparisons of the acoustic parameters measured with the proposed method and with a dodecahedron speaker are presented and suggest the expected mean absolute error and standard deviation for similar measurements. Reverberation time measurements show a mean absolute error of less than 0.08 s, as compared with measurements with a dodecahedron speaker. The proposed method can be the primary method for measuring impulse responses when a dodecahedron speaker is not available. Suggested improvements may lead to better omnidirectionality as compared with a dodecahedron loudspeaker, and set the method applicable to be utilized for auralization purposes. http://creativecommons.org/licenses/by/4.0/Applied Sciences89Papadakis_et_al_Appl. Sci._8(9)_2018.pdfChania [Greece]Library of TUC2019-05-31application/pdf2.2 MBfree Papadakis Nikolaos Παπαδακης Νικολαος Stavroulakis Georgios Σταυρουλακης Γεωργιος MDPI Acoustic parameters Auralization Impulse response Low-cost impulse response measurement Omnidirectional source Reverberation time Sound source