Digital Filters with MATLAB by Ricardo Losada

Tutorial on digital filter design and implementation with MATLAB. (allpass, fir, polyphase)

Simulating CIC filtering/decimation without the Filter Design Toolbox by Shen Hsiao Tan

Simulates the effects of CIC filtering and decimation (cic, signal processing)

cicdesign(R, N, M)

cicfilter(f, x)