TheComet / tfp

Transfer Function Plotter tool

Transfer Function Plotter

An application for designing, manipulating and visualising the behaviour of LTI (linear time-invariant) systems based on transfer functions.

Transfer functions are used in the analysis of the dynamic behaviour of many single-input single-output physical processes, typically within the fields of signal processing, communication theory, control theory and in micro electronics.

Features being worked on are:

• Manipulation:
  • Driving-Point Signal Flow Graph (DPSFG) drawing tool.
  • Standard low order filter designer (1st and 2nd order low/high/band/notch filters)
  • Butterworth filter designer
  • Chebyshev type I and II filter designer
  • Elliptic filter designer
  • Bessel filter designer
• Visualisation
  • Frequency response (aka Bode plot)
  • Pole-Zero diagram
  • 3D Pole-Zero diagram
  • Time domain step and impulse responses

And here's what it looks like.

(See animation here)

Compiling

You will need Qt 5.x and cmake to build this project.

Linux

$ mkdir build && cd build
$ cmake ..
$ make -j8

Windows

Start your VS command prompt (so vcvarsall.bat is called). Change folder names as needed (the following assumes you have Qt5.9.1 built with msvc2015 installed):

set Qt5_DIR=C:\Qt\5.9.1\msvc2015
mkdir build
cd build
cmake -G "Visual Studio 17 2015 Win64"
msbuild "transfer function plotter.sln"
(or just double-click on the solution to open VS)

Running

An executable is placed under build/bin called tfp_application(.exe). Executing it will open the main application.

Each plugin creates an executable for running its unit tests called test_<plugin name>(.exe). For example, if you want to run unit tests from the DPSFG plugin, you would execute test_dpsfg(.exe).

You can also run all unit tests by executing test_all(.exe).