Custom Grids

As stated earlier you can provide the sound field simulation functions a custom grid instead of the [min max] ranges. Again, you can provide it for one dimension, two dimensions, or all three dimensions.

conf = SFS_config;
conf.dimension = '3D';
conf.secondary_sources.number = 225;
conf.secondary_sources.geometry = 'sphere';
conf.resolution = 100;
conf.plot.normalisation = 'center';
X = randi([-2000 2000],125000,1)/1000;
Y = randi([-2000 2000],125000,1)/1000;
Z = randi([-2000 2000],125000,1)/1000;
sound_field_mono_wfs(X,Y,Z,[0 -1 0],'pw',800,conf);
%print_png('img/sound_field_wfs_3d_xyz_custom_grid.png');
conf.plot.usedb = true;
conf.dimension = '2.5D';
conf.secondary_sources.number = 64;
conf.secondary_sources.geometry = 'circle';
sound_field_imp_nfchoa(X,Y,0,[0 2 0],'ps',0.005,conf);
%print_png('img/sound_field_imp_nfchoa_25d_dB_custom_grid.png');

Fig. 24 Sound pressure of a monochromatic point source synthesized by 3D WFS. The plane wave has a frequency of 800 Hz and is travelling into the direction (0,-1,0). The sound pressure is calculated only at the explicitly provided grid points.

Fig. 25 Sound pressure in decibel of a broadband impulse point source synthesized by 2.5D NFC-HOA. The point source is placed at (0,2,0) m and a time snapshot after 5 ms of the first active secondary source is shown. The sound pressure is calculated only at the explicitly provided grid points.