part of QDaq (https://gitlab.com/qdaq/qdaq) - Qt-based Data Acquisition
A driven damped oscillator system can be used as a low-pass signal filter that has the extra advantage of providing the 1st order time derivative of the signal; thus, it can also be used as a differentiator.
The following figure shows a 0.2 Hz noizy signal filtered by a 1 Hz DDO. The bottom graph shows the signal derivative as obtained by the DDO.
This project contains the following:
- src/ A templated C++ class implementing the DDO filter, contained in DDO.h, and a command line filtering application ddo.cpp
- octave/ A set of OCTAVE (https://www.octave.org) scripts for experimenting with the filter
- doc/ A LaTeX document with the mathematics
The project can be built with cmake, preferably with the following commands
mkdir .build
cd .build
cmake ..
make (or nmake)