Book excerpt: This book covers how to implement MATLAB GUI from scratch: Discrete Signals And Systems, IIR Filter: Direct Form I, IIR Filter: Direct Form II, IIR Filter: Lattice Form, Odd Length Symmetric Linear-Phase Filter, Hamming-Window-Based FIR Filter And Its Implementation On Audio File, and Various Windows Based FIR Filter And Its Implementation On Audio Signal. Primarily aimed at a first course in programming for high school and undergraduate students, this book teaches the practical concepts of GUI programming. The chapter sequence covers programs that produce graphics, building up to an emphasis on GUI tools for signal processing. Topics include programming basics, creating GUI with GUIDE, and graphics and GUI techniques.