In response to numerous requests we've begun a significant upgrade to AllSignalProcessing.com - the addition of Exercises, Explorations, and Problems. All of these are designed to give you practice applying the concepts introduced in many of the lessons. Exercises tend to be mostly pencil and paper practice while Explorations are primarily MATLAB based. Problems are generally more advanced and involve a mix of MATLAB and pencil and paper based activities. Links to these pages appear in the Supplementary Materials section of the corresponding lessons, and are also available at the Table of Contents. It will take some time to prepare and post all of the material I have planned, so please be patient while you watch for new material to fill out the site.