Butterworth Filter

Port of the scipy digital butterworth filter design methods to C++. The filter can be used to filter a signal with second order sections online (push sample through sections individually) or offline (process whole signal). The project uses CMake as build-tool and googletest as testing-framework.

How to build and run the tests (start from top-level directory)

cmake -S . -B build
cmake --build build
cmake --build build --target test # to run the tests
cmake --build build --target install # to install the library (run with sudo if required)

You can then change into the build directory and run the example application

cd build && ./filter_example

The example application will produce build/original.txt, build/process_batch.txt and build/process_sample.txt. You can display their content with

cd .. # change back to the top-level directory
python3 test_data/vis_example_output.py

The example directory contains the example application and a CMakeLists.txt file demonstrating how to use the library after it has been installed. After changing into the example directory, it can be built exactly like described above:

cmake -S . -B build
cmake --build build
cd build && ./filter_example