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Monday, July 8 • 17:50 - 18:10
SOUND FIELD RECONSTRUCTION IN A ROOM USING LOW-RANK APPROXIMATION OF MODESHAPES: VALIDATION AND APPLICATION

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Sound field reconstruction in rooms is a subject of high interest in the domain of acoustic research. At low frequencies, a thorough understanding of sound field distribution is the key to identifying imbalance and irregularities caused by the room which will eventually lead to the coloration of sounds. Traditionally, an accurate rendering of the sound field would require an impractically high number of microphone measurements at multiple locations in the room. Our research tackles this issue by exploiting the sparsity in modal decomposition expression of the sound field with the use of low-rank approximation technique to significantly reduce the number of measurements. We first benchmark the techniques on an existing non-rectangular room model in Finite Element Method simulation with different room settings to validate the high robustness and accuracy of the framework. The evaluation gives accurate results as the reconstructed sound fields are in very good agreement with the simulation reference and the existence of mode shapes are accurately depicted. Finally, we also prove that the framework performs well in cases where the sound field is altered by placing several active low frequency absorbers inside the room. This shows that our framework can be further extended to assess the performance of passive/active absorbers in the domain of room modes equalization.

Moderators
LH

Lars Håkansson

professor, Linnaeus University
TK

Triantafillos Koukoulas

Dr, Korea Research Institute of Standards and Science

Authors

Monday July 8, 2019 17:50 - 18:10 EDT
Westmount 2
  T01 Ac. meas. & instrum., RS02 Measur techniq & sens