pyfda
======
## Python Filter Design Analysis Tool
pyfda is a GUI based tool in Python / Qt for analysing and designing discrete time filters. Fixpoint implementations (for some filter types) can be simulated.
For more info see the [`Github Repo`](https://github.com/chipmuenk/pyfda) and the documentation at [readthedocs.org](https://pyfda.readthedocs.io/en/latest/).
## Prerequisites
* Python versions: **3.7 ... 3.11**
* All operating systems, no OS specific requirements.
* Libraries:
* **(Py)Qt5**
* **numpy**
* **scipy**
* **matplotlib**: **2.1** or higher
### Optional libraries:
* **docutils** for rich text in documentation
* **xlwt** and / or **XlsxWriter** for exporting filter coefficients as *.xls(x) files
## Installing pyfda
Self-executing archives are available for Windows and OS X at https://github.com/chipmuenk/pyfda/releases which do not require a Python installation. Under Linux, pyfda can be installed as a flatpak.
Otherwise, installation is straight forward: There is only one version of pyfda for all supported operating systems, no compilation is required:
### pip
Install from PyPI using
> pip install pyfda
or upgrade using
> pip install pyfda -U
or install locally using
> pip install -e <YOUR_PATH_TO_PYFDA>
where `<YOUR_PATH_TO_PYFDA>` specifies the path of `setup.py` without including `setup.py`.
In this case, you need to have a local copy of the pyfda project, preferrably obtained using git and `pip install` only creates the start script.
### setup.py
You could also download the zip file from Github and extract it to a directory of your choice. Install it either to your `<python>/Lib/site-packages` subdirectory using
> python setup.py install
or just create a link to where you have copied the python source files (for testing / development) using
> python setup.py develop
## Starting pyfda
In any case, the start script `pyfdax` has been created in `<python>/Scripts` which should be in your path. So, simply start pyfda using
> pyfdax
For development and debugging, you can also run pyfda using
In [1]: %run -m pyfda.pyfdax # IPython or
> python -m pyfda.pyfdax # plain python interpreter
All individual files from pyfda can be run using e.g.
In [2]: %run -m pyfda.input_widgets.input_pz # IPython or
> python -m pyfda.input_widgets.input_pz # plain python interpreter
## Customization
The location of the following two configuration files (copied to user space) can be checked via the tab `Files -> About`:
- Logging verbosity can be controlled via the file `pyfda_log.conf`
- Widgets and filters can be enabled / disabled via the file `pyfda.conf`. You can also define one or more user directories containing your own widgets and / or filters.
Layout and some default paths can be customized using the file `pyfda/pyfda_rc.py`, right now you have to edit that file at its original location.
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