Unified Auralization of Room Simulations; Investigation of sampling grids and other parameters
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Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Sound and vibration (MPSOV), MSc
Publicerad
2024
Författare
Xuanye, Liu
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
With the development of computer science and the increase in computing power,
the finite-difference time-domain method has gradually become a viable option for
solving wideband, transient problems in acoustics simulation. In this method, the
binaural response can be extracted by local sampling of the finite-difference grid
using an array of receivers. This thesis focuses on the effects of the grid size, the
spacing of grid points, and the distribution of grid points in the case of a volumetric
sampling. This thesis also investigates the effect of the change in impulse response
length and others. These effects include variations in numerical robustness and the
frequency properties of the generated audio signal. In order to achieve this study,
this thesis simulates the sound field formed by a single plane wave propagation. By
sampling this sound field with a volumetric grid, the plane wave density function
is calculated using the plane wave decomposition method and integrated with
free-field head-related transfer functions in the spherical harmonics domain to get the
binaural impulse response. The results of the valuable work show that the numerical
stability of a volumetric grid with uniformly distributed sampling points is greatly
affected at high frequencies due to spatial aliasing. In addition, the results also give
some valuable conclusions for the selection of the impulse response length and the
selection of the number of sampling points.
Beskrivning
Ämne/nyckelord
FDTD, Plane wave decomposition, Sampling grid, Spatial audio