Requirements: GSL, Qwt
Limitations:

This is the beginning of a signal processing library for RTXI. Currently, it includes classes for designing lowpass, highpass, bandpass, and bandstop FIR filters using the window method. Generic filter windows have also been implemented, including triangular (Bartlett), Hamming, Hann, Dolph-Chebyshev, and Kaiser windows. Examples of how to use this library can be found in in the FIRwindow module. Extract the DSP folder and put it inside your include folder.