Aicraft flyover auralization using Atmospheric Ray Tracing - Comparing two wind directions

Virtual aircraft flyover using physics-based simulation of atmospheric sound propagation and binaural reproduction for the audio. To get a proper spatial impression, using headphones is advised. The visual model, called IHTApark, is designed using the Unreal Engine 4 showing the surroundings of our institute.
The Atmospheric Ray Tracing (ART) framework considers advection and refraction due to wind and inhomogeneity of the atmosphere. It finds the curved propagation paths connecting the aircraft (source) with the listener (receiver) including direct sound and ground reflection. Based on those paths, acoustic effects such as air attenuation, spreading loss, propagation delay and Doppler-shift are modelled and applied to the audio signal using Virtual Acoustics.
During the flyover, two wind directions are switched back and forth. In the considered scenario, the wind direction especially influences the propagation delay. As a result, the comb filter caused by the superposition of direct sound and ground reflection is shifted changing the coloration of the audio. Additionally, the pitch of the noise signal is affected as also the Doppler-shift depends on the delay.
Get more information on the underlying models using the following links:
Atmospheric Ray Tracing: virtualacoustic...
Virtual Acoustics: virtualacoustic...
IHTApark model database: zenodo.org/rec...
Publications:
Atmospheric Ray Tracing: doi.org/10.105...
IHTApark model: doi.org/10.338...