|
|
Design of a spherical microphone array
Voch, Filip ; Schimmel, Jiří (referee) ; Liska, Matej (advisor)
Spherical microphone array is one of the ways to record spatial sound. This paper proposes rigid spherical array for beamforming and mixed order ambisonics using MEMS sensors connected with TDM bus. MEMS sensors are used due to their small size. Digital output signal is transferred to external signal processor using time division multiplexing. This paper describes an approach to design of the array for beamforming using mathematical methods for node layout on a sphere and for ambisonics using spherical harmonic functions. For prototype realization there is created design with uniformly distributed microphones on the sphere. There are flexible printed circuit boards designs for connecting the microphones. Those boards are then connected to central printed circuit board, where are the signals converted to resp. from differential signal for transfer between the array and the signal processor. RJ-45 connectors are being used for this transfer. Microphones are connected to the buses by USB-C connectors. The result is framework solution including 3D model and printed circuit board designs for microphone connection. 3D model is designed in Fusion 360 software and printed circuit boards in KiCad.
|
|
|
Light Propagation Volumes
Mikulica, Tomáš ; Polok, Lukáš (referee) ; Kobrtek, Jozef (advisor)
This thesis deals with problem of computation of global illumination in real-time. Two methods are described. Namely Reflective Shadow Maps and Light Propagation Volumes. The first of them deals with the problem by using extended Shadow Mapping algorithm. The second one uses scene embedded into a 3D grid together with Spherical harmonics to compute light propagation in the scene. Furthermore this thesis contains results of measurement of the rendering speed of the Light Propagation Volumes algorithm with various settings on several machines. Quality of the resulting output of the algorithm is also evaluated.
|
|
|
Guiding a Path Tracer with Local Radiance Estimates
Berger, Martin ; Wilkie, Alexander (advisor) ; Křivánek, Jaroslav (referee)
Path tracing is a basic, statistically unbiased method for calculating the global illumination in 3D scenes. For practical purposes, the algorithm is too slow, so it is used mainly for theoretical purposes or as a base for more advanced algorithms. This thesis explores the possibility of improving this algorithm by augmenting the sampling part, which computes outgoing directions during ray traversal through the scene. This optimization is accomplished by creating a special data structure in a preprocess step, which describes approximate light distribution in the scene and which then aids the sampling process. The presented algorithm is implemented in the PBRT library.
|
|
|
Guiding a Path Tracer with Local Radiance Estimates
Berger, Martin ; Wilkie, Alexander (advisor) ; Křivánek, Jaroslav (referee)
Path tracing is a basic, statistically unbiased method for calculating the global illumination in 3D scenes. For practical purposes, the algorithm is too slow, so it is used mainly for theoretical purposes or as a base for more advanced algorithms. This thesis explores the possibility of improving this algorithm by augmenting the sampling part, which computes outgoing directions during ray traversal through the scene. This optimization is accomplished by creating a special data structure in a preprocess step, which describes approximate light distribution in the scene and which then aids the sampling process. The presented algorithm is implemented in the PBRT library.
|
|
|
Light Propagation Volumes
Mikulica, Tomáš ; Polok, Lukáš (referee) ; Kobrtek, Jozef (advisor)
This thesis deals with problem of computation of global illumination in real-time. Two methods are described. Namely Reflective Shadow Maps and Light Propagation Volumes. The first of them deals with the problem by using extended Shadow Mapping algorithm. The second one uses scene embedded into a 3D grid together with Spherical harmonics to compute light propagation in the scene. Furthermore this thesis contains results of measurement of the rendering speed of the Light Propagation Volumes algorithm with various settings on several machines. Quality of the resulting output of the algorithm is also evaluated.
|
guest ::
