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Analyze, visualize and process sound field data recorded by spherical microphone arrays.

Project Description

The sound_field_analysis toolbox (short: sfa) is a Python port of the Sound Field Analysis Toolbox (SOFiA) toolbox, originally by Benjamin Bernschütz[1]. The main goal of the sfa toolbox is to analyze, visualize and process sound field data recorded by spherical microphone arrays. Furthermore, various types of test-data may be generated to evaluate the implemented functions.

The package is pure python and PEP8 compliant (except line-length). Please expect things to be slow for now and for the API to break, as the development is still very much ongoing.


We use Python 3.5 for development. Chances are that earlier version will work too but this is currently untested.

The following external libraries are required:


You can simply install sfa through pip (pip install sound_field_analysis).

We highly recommend the Anaconda python environment. Once installed, you can use the following steps to create a new environment with the sfa toolbox.

  1. Create a new environment: conda create --name sfa numpy scipy plotly
  2. Activate this environment: source activate sfa
  3. Install from pypi: pip install sound_field_analysis

Soon, you may also install directly from the conda-forge channel using conda install -c conda-forge sound_field_analysis.


Please find the full documentation over at!


The following examples are available as Jupyter notebooks, either statically on github or interactively on nbviewer. You can of course also simply download the examples and run them locally!

AE1: Ideal plane wave

Ideal unity plane wave simulation and 3D plot.

View interactively on nbviewer

AE3: Measured plane wave

A measured plane wave from AZ=180°, EL=90° in the anechoic chamber using a cardioid mic.

View interactively on nbviewer

AE6: Impulse response of ideal plane wave

Impulse Response reconstruction on a simulated ideal unity plane wave

View interactively on nbviewer

AE7: Impulse response of sampled plane wave

Impulse response reconstruction on a simulated sampled unity plane wave

View interactively on nbviewer


The sound_field_analysis toolbox is based on the Matlab/C++ Sound Field Analysis Toolbox (SOFiA) toolbox by Benjamin Bernschütz. For more information you may refer to the original publication:

[1] Bernschütz, B., Pörschmann, C., Spors, S., and Weinzierl, S. (2011). SOFiA Sound Field Analysis Toolbox. Proceedings of the ICSA International Conference on Spatial Audio

The Lebedev grid generation was adapted from an implementation by Richard P. Muller.

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