Graphical design of frequency sampling filters for use in a signals and systems laboratory

In this paper, we present educational filter design tools used in the signals and systems course. A graphical-user-interface (GUI) for filter design using the frequency-sampling method has been developed and embedded as a module in the Java-DSP (J-DSP) editor. Three realizations are presented: the non-recursive, non-recursive using least squares, and recursive. The paper describes several laboratory exercises that involve interactive filter design using the ´freq. samp´ block. The performance of the frequency sampling method is compared against the performance of the Kaiser and Parks-McClellan algorithms. The exercises have been used at Arizona State University in the signals and systems course. Pre- and post- assessment quizzes have been assigned and results have been compiled to evaluate the learning attributed specifically to the J-DSP software and exercises.