Abstract
Alternative 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.
Highlights
Impulse response is the temporal evolution of the sound pressure observed at a point in a room as a result of the emission of a Dirac impulse at another point in the room [1]
A possible explanation might be that the differences of the sound fields created between the dodecahedron speaker and the proposed method are more profound in the early stages of the impulse response measurements created for each case
There seems to be a deviation of the results at high frequency range, which should be due to the different speaker directivity compared to the dodecahedron speaker
Summary
Impulse response is the temporal evolution of the sound pressure observed at a point in a room as a result of the emission of a Dirac impulse at another point in the room [1]. The measurement of an impulse response utilizes a dodecahedron speaker following the sound source requirements according to ISO 3382-1:2009 [2]. For a more complete description of the acoustical conditions in a space, acoustic parameters such as Reverberation Time (RT), Early Decay Time (EDT), Clarity (C80 ), Definition (D50 ), Centre Time (Ts ) and Source Strength (G) [2] can be obtained directly from the impulse response. These parameters can be used to assess the acoustic quality of a space and provide guidance for possible improvements.
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