Room impulse response measurement and delay-and-sum beamforming, application to room and building acoustics
Regular paper
GFaI
Monday 1 june, 2015, 12:00 - 12:20
0.9 Athens (118)
Abstract:
Room impulse response measurements using deterministic signals like sine sweeps is a well-established method used to obtain objective parameters that describe the acoustic field in 3-dimensional space. Combined with conventional delay-and-sum beamforming, it becomes a very powerful tool offering precise information about the behavior of acoustics waves inside or between rooms. The use of a transparent array allows us to process directly the signal captured by the microphones by deconvolution, and the resulting room impulse responses by the beamformer. This permits a precise localization of the direct sound and the early reflections over time and space. Additionally, the high signal-to-noise ratio offered by the method permit to highlight leakage and airborne sound transmission paths between rooms. Finally, the repeatability of the method allows for a comparison of measurements of various room configurations, for example in the case of acoustic treatment and optimization.