Signal Processing Reference http://scipy-cookbook.readthedocs.io/items/idx_signal_processing.html FFT Filters in Python http://www.phys.nsu.ru/cherk/fft.pdf Kalman Filter https://www.youtube.com/watch?v=CaCcOwJPytQ&feature=youtu.be https://pykalman.github.io/ https://medium.com/@jaems33/understanding-kalman-filters-with-python-2310e87b8f48 Biquads http://www.earlevel.com/main/2003/02/28/biquads/ Q factor http://www.earlevel.com/main/2013/10/13/biquad-calculator-v2/ http://www.earlevel.com/scripts/widgets/20131013/biquads2.js