Acoustic toolbox

openPSTD v1 (v1.1. includes GPU acceleration)

Description: An open source implementation to provide an intuitive visual interface of the Fourier pseudospectral time-domain (PSTD) method for computing the propagation of sound in the built environment by solving the wave equation. PSTD maintains efficiency in processing time and memory usage as it allows to spatially sample close to the Nyquist criterion. The physical geometry is created in Blender as a composition of rectangular two-dimensional subdomains, hence restricting the implementation to orthogonal and two-dimensional situations. Boundary conditions are limited to frequency dependent numbers. The output of openPSTD are time responses of pressure signals. 
Requirements for running: Blender 2.74, Python (Python 2 if you want to utilize GPU acceleration), Numpy
License: GNU General Public License
Researchers involved: Maarten Hornikx, Thomas Krijnen, Louis van Harten
References: Documentation can be found here.
Hornikx, M., Krijnen, T. and van Harten, L., 2016. openPSTD: The open source pseudospectral time-domain method for acoustic propagation. Computer Physics Communications, 203, pp.298-308.

Impedance gun post-processing: DBM model fitting

Description: This program computes the complex reflection coefficient of a porous material from 4 IRs (audio files) measured with the impedance gun (pressure and velocity in free field + pressure and velocity near the surface) and further estimates the low frequency properties by model fitting with the Delany-Bazley-Miki model for porous materials. 
Requirements for running: Matlab with ‘Signal processing toolbox’ and ‘Optimization toolbox’
License: Matlab license
Researchers involved: Baltazar Briere de La Hosseraye, Maarten Hornikx
References:
B. Briere de La Hosseraye, M. Hornikx, J. Yang, Broadband Acoustic Material Xharacterization By Means of in-Situ Measurements and Impedance Model Fitting. In proceedings of Forum Acusticum, Dec 2020, Lyon, France. pp.115-121, 2020.