Interactive modification of scene geometry is an important factor to improve the user's immersion in a virtual acoustic environment However, modifications such as changes of surface properties and the scene geometry itself can result in strong sound field variations within very small time intervals. The opening and closing of a door to a neighbouring room which contains a high volume sound source illustrates such an event. In the sense of physical consistency, it is not sufficient to simulate these events by just adapting the volume of the sound source, as the process of opening and closing of a door usually results in a significant change of reverberation time, sound coloration and source localization. Real-time auralization by means of finite impulse response filters (FIR filters) is usually performed by non-uniformly partitioned frequency-domain convolution. Slight changes in room acoustics can easily be incorporated into these algorithms, but fast changes require special filter exchange strategies. The low-pass characteristic of a door being closed will immediately influence the whole room impulse response (RIR). Therefore, the entire filter must be exchanged instantly to maintain physical consistency. In this contribution, efficient strategies for fast exchange of filters are proposed for a non-uniform partitioned convolution approach. Their relations to filter partitions are discussed and the computational costs are analyzed.
展开▼
