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Session 1320

Teaching Transfer Functions with MATLAB and Real-Time DSP

Cameron H. G. Wright Department of Electrical Engineering U.S. Air Force Academy, CO

Thad B. Welch, Michael G. Morrow Department of Electrical Engineering U.S. Naval Academy, MD

Abstract

This paper describes a synergistic combination of hardware and software which makes teaching and demonstrating the concepts of system transfer functions much easier and more effective. The program interfaces Matlab directly to an inexpensive Texas Instruments TMS320C6711 DSP Starter Kit without requiring specialized pro- gramming by the professor or student. It eliminates the need to purchase expensive software or hardware for teaching these concepts.

1 Introduction

Modern software tools such as Matlab greatly facilitate a professor’s ability to demonstrate a variety of concepts, including linear systems and the underlying system transfer function (TF). These concepts can be further reinforced, and greater interest generated by the stu- dents, if they can be easily demonstrated in real-time using modern digital signal processing (DSP) hardware. Affordable hardware is now available to schools, for example, in the form of DSP Starter Kits (DSKs) by Texas Instruments. This paper will examine how Matlab, already accepted as a powerful educational tool in engineering, can be closely integrated with a DSK for teaching purposes while avoiding the tedium of manually programming the DSP device.

2 Signal Processing Background

The process whereby an engineer determines the transfer function of an unknown “black box” based upon the inputs and outputs is known as system identification (SI). The need to

Proceedings of the 2001 American Society for Engineering Education Annual Conference & Exposition Copyright c 2001, American Society for Engineering Education

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Wright, C., & Morrow, M., & Welch, T. (2001, June), Teaching Transfer Functions With Matlab And Real Time Dsp Paper presented at 2001 Annual Conference, Albuquerque, New Mexico. 10.18260/1-2--9882