# scikit-dsp-comm
[](https://pypi.python.org/pypi/scikit-dsp-comm)
[](https://anaconda.org/conda-forge/scikit-dsp-comm)
[](http://scikit-dsp-comm.readthedocs.io/en/latest/?badge=latest)
## Background
The origin of this package comes from the writing the book Signals and Systems for Dummies, published by Wiley in 2013. The original module for this book is named `ssd.py`. In `scikit-dsp-comm` this module is renamed to `sigsys.py` to better reflect the fact that signal processing and communications theory is founded in signals and systems, a traditional subject in electrical engineering curricula.
## Package High Level Overview
This package is a collection of functions and classes to support signal processing and communications theory teaching and research. The foundation for this package is `scipy.signal`. The code in particular currently requires Python `>=3.7x`.
**There are presently ten modules that make up scikit-dsp-comm:**
1. `sigsys.py` for basic signals and systems functions both continuous-time and discrete-time, including graphical display tools such as pole-zero plots, up-sampling and down-sampling.
2. `digitalcomm.py` for digital modulation theory components, including asynchronous resampling and variable time delay functions, both useful in advanced modem testing.
3. `synchronization.py` which contains phase-locked loop simulation functions and functions for carrier and phase synchronization of digital communications waveforms.
4. `fec_conv.py` for the generation rate one-half and one-third convolutional codes and soft decision Viterbi algorithm decoding, including soft and hard decisions, trellis and trellis-traceback display functions, and puncturing.
5. `fir_design_helper.py` which for easy design of lowpass, highpass, bandpass, and bandstop filters using the Kaiser window and equal-ripple designs, also includes a list plotting function for easily comparing magnitude, phase, and group delay frequency responses.
6. `iir_design_helper.py` which for easy design of lowpass, highpass, bandpass, and bandstop filters using scipy.signal Butterworth, Chebyshev I and II, and elliptical designs, including the use of the cascade of second-order sections (SOS) topology from scipy.signal, also includes a list plotting function for easily comparing of magnitude, phase, and group delay frequency responses.
7. `multirate.py` that encapsulate digital filters into objects for filtering, interpolation by an integer factor, and decimation by an integer factor.
8. `coeff2header.py` write `C/C++` header files for FIR and IIR filters implemented in `C/C++`, using the cascade of second-order section representation for the IIR case. This last module find use in real-time signal processing on embedded systems, but can be used for simulation models in `C/C++`.
Presently the collection of modules contains about 125 functions and classes. The authors/maintainers are working to get more detailed documentation in place.
## Documentation
Documentation is now housed on `readthedocs` which you can get to by clicking the docs badge near the top of this `README`. Example notebooks can be viewed on [GitHub pages](https://mwickert.github.io/scikit-dsp-comm/). In time more notebook postings will be extracted from [Dr. Wickert's Info Center](https://faculty.uccs.edu/mwickert/).
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