The package DSPTricks is a set of LaTeX macros (based on PSTricks) for plotting the kind of graphs and figures that are usually employed in digital signal processing publications. DSPTricks provides facilities for standard discrete-time “lollipop” plots, continuous-time and frequency plots, and pole-zero plots.
The companion package DSPFunctions (dspfunctions.sty) provides macros for computing frequency responses and DFTs, while the package DSPBlocks (dspblocks.sty) supports DSP block diagrams.

The author is Paolo Prandoni. The package is Copyright © 2014 Paolo Prandoni.