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Using the Motorola DSP56002 EVM for Audio Processing in a DSP Laboratory

Richard E. Piile Purdue School of Engineering and Technology at IUPUI

Abstract

The EET department at Indiana University-Purdue University at Indianapolis developed a Real Time Digital Signal Processing course with a practical focus on the implementation of DSP algorithms on a real time processor. A low cost 24 bit fixed point real time processor is used for the laboratories, The laboratories focus on audio effects which includes such projects as a guitar tuner, FIR and IIR filters, and tone generators.

Motorola recently introduced the DSP56002 EVM; an evaluation module for the DSP56002 chip. The EVM was designed to provide a low cost test platform for customers interested in evaluating the 24 bit 56002 digital signal processor. The EVM’S low cost and high performance make it an ideai teaching platform for educational institutions interested in developing a real time digital signal processing course with a laboratory.

The EVM hardware includes A/D and D/A converters capable of converting up to 48K samples per second. Two channels each of input and output are provided which can be used for stereo audio experiments.

The EVM comes packaged with an assembler and full screen debugger which interfaces to a personal computer through the serial port. The debugger displays all registers and selected memory locations which allows students to step through programs and easily observe the operation of the DSP chip.

The EVM costs $120.00. For an extra $100. a keyboard, good quaiity amplified speaker, and cassette player were purchased to go with the system. This equipment along with an oscilloscope and function generator was all that was necessary to equip laboratory stations to perform a variety of DSP experiments. Several laboratories using audio effects proved to be extremely popular with students.

Introduction

The EET department at Indiana University-Purdue University at Indianapolis has developed a Digital Signal Processing course with an applied focus on the implementation of DSP algorithms using a real time DSP processor. Because specialized DSP processors have an instruction set optimized for implementation of DSP algorithms, the programs are quite short and programming can be taught in very little time. If an assembly language programming capability is a prerequisite for the course, I have

$iii& 1996 ASEE Annual Conference Proceedings F ‘...,pT:?.? .

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Pfile, R. E. (1996, June), Using The Motorola Dsp56002 Evm For Audio Processing In A Dsp Laboratory Paper presented at 1996 Annual Conference, Washington, District of Columbia. 10.18260/1-2--6386