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pyFDA is a python tool with a user-friendly GUI for designing and analysing discrete time filters.

Project Description

Python Filter Design Analysis Tool

pyFDA is a GUI based tool in Python / Qt for analysing and designing discrete time filters. The capability for generating Verilog and VHDL code for the designed and quantized filters will be added in the next release.

.. image::
:width: 300px


Besides standard python libraries, the project requires the following libraries:

* numpy
* scipy
* matplotlib
* pyQt4 or pyQt5

* Optional libraries:
* docutils for rendering info text as rich text
* xlwt and / or XlsxWriter for exporting filter coefficients as \*.xls(x) files

Installing and starting pyFDA

``>> pip install pyfda``

or download the zip file and extract it to a directory of your choice. Install it either to your ``<python>/Lib/site-packages`` subdirectory using

``>> python install``

or run it where you have installed the python source files using (for testing / development)

``>> python develop``

In both cases, start scripts ``pyfdax`` and `pyfdax_no_term` are created (with / without terminal).

For development, you can also run pyFDA using::

In [1]: %run -m pyfda.pyfdax # IPython or
>> python -m pyfda.pyfdax # plain python interpreter

or run individual files from pyFDA using e.g.::

In [2]: %run -m pyfda.input_widgets.input_pz # IPython or
>> python -m pyfda.input_widgets.input_pz # plain python interpreter


The layout and some default paths can be customized using the file ``pyfda/``.


* **Filter design**
* **Design methods** from scipy.signal: Equiripple, Firwin, Butterworth, Elliptic, Chebychev 1 and Chebychev 2
* **Remember all specifications** when changing filter design methods
* **Fine-tune** manually the filter order and corner frequencies calculated by minimum order algorithms
* **Compare filter designs** for a given set of specifications and different design methods
* **Filter coefficients and poles / zeroes** can be displayed, edited and quantized

* **Clearly structured GUI**
* only widgets needed for the currently selected design method are visible
* enhanced matplotlib NavigationToolbar (nicer icons, additional functions)

* **Common interface for all filter design methods:**
* specify frequencies as absolute values or normalized to sampling or Nyquist frequency
* specify ripple and attenuations in dB, as voltage or as power ratios
* enter expressions like exp(-pi/4 * 1j) with the help of the library ``simpleeval`` ( (included in source files)

* **Graphical Analyses**
* Magnitude response (lin / power / log) with optional display of specification bands, phase and an inset plot
* Phase response (wrapped / unwrapped)
* Group delay
* Pole / Zero plot
* Impulse response and step response (lin / log)
* 3D-Plots (\|H(f)\|, mesh, surface, contour) with optional pole / zero display

* **Modular architecture**, facilitating the implementation of new filter design and analysis methods
* Filter design files not only contain the actual algorithm but also dictionaries specifying which parameters and standard widgets have to be displayed in the GUI.
* Special widgets needed by design methods (e.g. for choosing the window type in Firwin) are included in the filter design file, not in the main program
* Filter design files can be added and edited *without* changing or even restarting the program

* **Saving and loading**
* Save and load filter designs in pickled and in numpy's NPZ-format
* Export coefficients and poles/zeros as comma-separated values (CSV), in numpy's NPZ-format, in Excel (R) or in Matlab (R) workspace format

* **Display help files** (own / Python docstrings) as rich text
* **Runs under Python 2.7 and Python 3.3 ... 3.5**
Release History

Release History

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Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
pyfda-0.1rc6-py2-none-any.whl (293.0 kB) Copy SHA256 Checksum SHA256 2.7 Wheel May 16, 2017
pyfda-0.1rc6-py3-none-any.whl (293.0 kB) Copy SHA256 Checksum SHA256 3.5 Wheel May 16, 2017
pyfda-0.1rc6.tar.gz (188.7 kB) Copy SHA256 Checksum SHA256 Source May 16, 2017

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