Influence of Crossover Frequency on a Hybrid Acoustic Model for Room Impulse Response Synthesis

Room impulse responses (RIRs) of arbitrary enclosures may be synthesized using acoustic modelling methods that all offer advantages and limitations in terms of accuracy and efficiency. The use of a hybrid model, which combines a finite difference time domain (FDTD) approach for the low frequency range, and geometric methods for the mid-high frequency range has been shown to provide appropriate results in the past. This thesis is concerned with the optimisation of such a method by reducing the crossover frequency between the two mixed models to improve its efficiency and cost. To that end, hybrid models are implemented to generate synthesized RIRs with various crossover frequencies. These RIRs are compared with real measurements from two different rooms in the time domain, in the frequency domain, and with the use of acoustic parameters.