Measurement of loudspeaker radiation patterns using planar microphone arrays
- Publication Type:
- Conference Proceeding
- Citation:
- INTER-NOISE 2015 - 44th International Congress and Exposition on Noise Control Engineering, 2015
- Issue Date:
- 2015-01-01
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| Measurement of loudspeaker radiation patterns using planar microphone arrays.pdf | Published version | 254.76 kB |
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The measurements of the spatial directivity and frequency response of a sound source are important in sound field reconstruction and noise control. General approaches for obtaining this spatial radiation feature usually require measuring acoustic pressure or velocity on spherical surfaces surrounding the tested source. Due to cost and limitation on measuring condition, the spherical surface measurements are not flexible for in-situ measurement. This paper investigates the link between spherical arrays and planar arrays from a new perspective and proposes a method for measuring radiation patterns of sound sources through planar microphone arrays. Uniformly-spaced arrays and concentric-ring arrays are discussed regarding to their accuracies in estimating coefficients of radiation patterns. Different configurations of planar arrays, such as one-layer array, double-layer array and one-layer array with image method, are also compared by simulation. Considering the convenience of planar arrays over spherical arrays, this method is promising in practice.
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