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The auralization of rooms with dynamic binaural synthesis using binaural room impulse responses (BRIRs) is an established approach in virtual audio. The BRIRs can either be obtained by simulations or by measurements. Up to now changed acoustical properties, as they occur when a room is altered in a renovation, cannot easily be considered in a measurement-based approach. This paper presents a new method to auralize modifications of existing rooms. The authors already have shown in a previous publication that such an auralization can be done by appropriately shaping the reverberation tail of an impulse response. Furthermore, the authors have presented an approach to synthesize BRIRs based on one omnidirectional room impulse response (RIR). In this paper, both methods are combined: A single measured omnidirectional RIR is enhanced and adapted to create a binaural representation of a modified room. A listening experiment has been performed to evaluate the procedure and to investigate differences between synthesized and measured BRIRs. The advantages of this method are obvious: Planned room modifications can be made audible without complex measurements or simulations; just one omnidirectional RIR is required to provide a binaural representation of the desired acoustic treatment.

Binaural room impulse responses (BRIRs) are often applied in spatial audio for the auralization of acoustical environments. In the same field of research, parametric audio coding is an established approach and part of different standards. The presented investigation aims for a parametric description of the sound field in order to synthesize BRIRs for a plausible auralization. The model focuses on the main features which characterize a BRIR as well as the acoustical environment. Thereto spherical microphone arrays are applied for a spatio-temporal acoustical analysis using spherical harmonics. Early reflections are determined with sound field decomposition techniques and are described by directional parameters. Diffuse components and the interaural coherence of the late reverberation are characterized with additionally parameters. In two previous studies, the synthesis of the early and the late part of BRIRs have been elaborated and perceptually evaluated apart from each other. Now both approaches are combined to synthesize entire BRIR datasets using the parametric approach. Fundamentals of the sound field analysis are explained and synthetic BRIRs are compared to their measured counterparts.