Int J Performability Eng ›› 2021, Vol. 17 ›› Issue (3): 307-313.doi: 10.23940/ijpe.21.03.p6.307313

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Polynomial Curve Fitting-based Early Room Reflection Analysis using B-Format Room Impulse Response Measurements for Ambient Sound Reproduction

 Vuppala Swathi and  Sandeep Chitreddy1,*()   

  1. Koneru Lakshmaiah Education Foundation, Hyderabad, 500075, India
  • Contact: Chitreddy Sandeep


A polynomial curve fitting based early room reflection parameter analysis is discussed in this work. Particularly, the spatial directions of ground reflections that are usually harder to extract from Omni-RIR are analyzed using measurements of B-Format microphones. A simulated model is initially presented with the ray approximation of sound propagation. Subsequently, a recently developed parameterization approach called Reverberant Spatial Audio Object (RSAO) is discussed for early reflection parameter extraction from measured B-Format RIRs. Parameters obtained from Simulated and RSAO methods are analyzed for 10 different source receiver distances. A publicly available classroom B-Format RIR database is used for extracting RSAO parameters for 10 distances. Polynomial curve fitting is performed on the parameters obtained from both methods. The optimal order that can generalize the 10 samples parameters is also obtained as part of this work. The results show that the method is suitable for obtaining parameters for non-measured directions from a sparse set of measurements of B-Format RIRs.

Key words: RSAO, spatial audio, RIR