Welcome to Diffusion Equation’s documentation

The software is an open source new generation of room acoustics software for research, education and industry in acoustics.

The software is based on the Acoustics Diffusion Equation Method for modeling of sound behaviour in complex geometrical spaces. The Diffusion Equation Method is used to understand the acoustics properties of the room and to obtain spatial distribution of acoustics energy over time. The software is developed with two numerical methods: the Finite Different Method and the Finite Volume Method. Each method is distributed with its own Python code. The main application of the method is room acoustics, but in the future it could also lead to more applications.

Software Presentation:

• Overview

Software Use:

• Finite Difference Method Use
  • Requirements
  • Usage & files
  • Inputs
  • Acoustics Calculation
  • References
• Finite Volume Method Use
  • Requirements
  • Usage & files
  • Inputs
  • Acoustics Calculation
  • References
• Auralization Use
  • Requirements
  • Usage & files
  • Inputs
  • Outputs

Software Theory:

• Diffusion Equation Finite Difference Method (FDM) documentation
  • Theory of Diffusion Equation model
  • Finite Different Scheme
  • References
• Diffusion Equation Finite Volume Method (FVM) Documentation
  • Theory of Diffusion Equation model
  • Finite Volume Scheme
  • References
• Auralization Documentation

API reference:

• FDM functions
  • Main function
    • run_fdm_sim()
  • Internal functions
    • abs_term()
    • beta_zero_fun()
    • comput_energy_density()
    • create_mesh()
    • diff_coeff()
    • dist_source_receiver()
    • dist_source_x_y()
    • equiv_absorp()
    • freq_param()
    • initial_condition()
    • number_freq()
    • rec_sourceon_time()
    • receiver_interpolation()
    • room_charact()
    • save_fdm()
    • source_interpolation()
• FVM functions
  • Main function
    • run_fvm_sim()
  • Internal functions
    • abs_term()
    • belem_area_centre()
    • beta_zero_freq_fun()
    • boundary_triang()
    • calculation_rec_time()
    • calculation_sourceon_time()
    • computing_energy_density()
    • create_vgroups_names()
    • diffusion_coeff()
    • distance_source_receiver()
    • equiv_absorp_area()
    • freq_parameters()
    • get_neighbour_faces()
    • get_nodes_elem()
    • initial_cond()
    • interior_tetra()
    • line_receivers()
    • number_freq()
    • point_inside_room()
    • receiver_interp()
    • room_dimensions()
    • save_fvm()
    • source_interp()
    • source_matrix()
    • source_volume()
    • surface_absorption_fun()
    • surface_area()
    • surface_materials()
    • velem_volume_centre()
• Reverberation functions
  • t60_decay()
  • definition()
  • clarity()
  • centretime()
• Auralization functions
  • Main function
    • run_auralization()
  • Internal functions
    • butter_filter()
    • convolution_fun()
    • create_noise()
    • extract_anechoic()
    • filtered_envelope()
    • filtered_noise()
    • generate_imp_resp()
    • load()
    • resample_pressure()
    • square_root_fun()
    • unfiltered_envelope()

Tutorials:

• Finite Difference Method Demo Tutorial
  • References
• Finite Volume Method Demo Tutorial

Indices and tables

• Index

• Module Index

• Search Page