Challenges in the Creation of Artificial Reverberation for Sound Field Synthesis: Early Reflections and Room Modes

摘要

Practical implementations of sound field synthesis evoke considerable artifacts that have to be considered in the creation of artificial reverberation. The most prominent artifact is spatial aliasing, which manifests itself as additional wave fronts that follow the desired synthetic wave front in time. These additional wave fronts propagate into different directions and occur at intervals that are similar to the intervals at which acoustic reflections occur in real rooms. It may be assumed that the human auditory system is not capable of differentiating aliasing artifacts and room reflections so that a synthetic reflection pattern should be designed such that it evokes a plausible pattern together with the aliased wave fronts. Two potential solutions are outlined. Finally, the capability of sound field synthesis of synthesizing room resonances (room modes) is analyzed and the promising results are illustrated based on numerical simulations.