Infinite Impulse Response filters - efficient but can be unstable. Definition $$ y[n] = \sum_{k=0}^{M} b_k x[n-k] - \sum_{k=1}^{N} a_k y[n-k] $$ Design Methods Butterworth (Maximally Flat) 1from scipy import signal 2 3# Design 4th-order Butterworth lowpass 4order = 4 5cutoff = 0.3 # Normalized frequency 6b, a = …