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This is a powerful filter library which implements all standard IIR filters such as Bessel, Butterworth, Elliptic and Chebychev. The data format is floating-point throughout. There is no need to resort to MATLAB/OCTAVE to calculate the filter coefficients because the library does it by itself. Just provide the sampling rate, cutoff frequency, filter order and the filter is ready to be used. Installation is done with the standard sequence: CXXFLAGS="-O3 -march=native" ./configure make sudo make install sudo ldconfig Usage is very simple. A demo program is in the "demo" directory which sets up a lowpass and a bandstop filter. A delta pulse is sent into the filters and saved as a gnuplot/octave file. For the documentation have a look at Documentation.txt This library has been adapted form Vinnie Falco's original work which can be found here: https://github.com/vinniefalco/DSPFilters The main advancement from the original library is the implementation of the "filter" function so that the IIR filter can be used in realime applications. This has been achieved by just re-shuffling existing code and making it available to the user in form of the API call "filter". Enjoy! Bernd Porr