Adding air attenuation to simulated room impulse responses: A modal approach
This work addresses the need for more accurate room acoustic simulations, particularly for high-frequency attenuation, but it appears incremental as it builds on existing modal approaches.
The authors tackled the problem of simulating room acoustics by developing an offline method to incorporate air absorption into room impulse responses, using a modal scheme for dissipative wave equations, and they presented numerical examples to evaluate it against existing filter-based methods.
Air absorption is an important effect to consider when simulating room acoustics as it leads to significant attenuation in high frequencies. In this study, an offline method for adding air absorption to simulated room impulse responses is devised. The proposed method is based on a modal scheme for a system of one-dimensional dissipative wave equations, which can be used to post-process a room impulse response simulated without air absorption, thereby incorporating missing frequency-dependent distance-based air attenuation. Numerical examples are presented to evaluate the proposed method, along with comparisons to existing filter-based methods.