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Real-time Digital Signal Processing Demonstration Platform

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2015 ASEE Annual Conference & Exposition


Seattle, Washington

Publication Date

June 14, 2015

Start Date

June 14, 2015

End Date

June 17, 2015





Conference Session

Computer Science, Computer Engineering, and Digital Systems Education 2

Tagged Division

Electrical and Computer

Page Count


Page Numbers

26.1306.1 - 26.1306.11



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Paper Authors


Joseph P Hoffbeck University of Portland

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Joseph P. Hoffbeck ( is an Associate Professor of Electrical Engineering at the University of Portland in Portland, Oregon. He has a Ph.D. from Purdue University, West Lafayette, Indiana. He previously worked with digital cell phone systems at Lucent Technologies (formerly AT&T Bell Labs) in Whippany, New Jersey. His technical interests include communication systems, digital signal processing, and remote sensing.

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Real-Time Digital Signal Processing Demonstration PlatformIn order to increase students' interest in digital signal processing (DSP), a series ofdemonstrations were developed to run in real-time on low cost, commercially availablehardware. This system could be used to give students hands-on experience with the algorithmsthat they are studying in a DSP or signals and systems course, or it could be used in recruitingstudents into electrical engineering. The algorithms include lowpass filter, highpass filter, echo,reverb, quantization, aliasing, Fast Fourier Transform (FFT), simple speech recognition, andvoice pitch change. The program allows the user to easily switch between algorithms, to adjustthe parameters of the algorithms, and to observe the results in real-time. The cutoff frequency ofthe filters can be changed, as can the delay of the echo and reverb, the number of bits in thequantization, the sampling frequency in the aliasing, and the frequency in the pitch changer. Thehardware consists of the C5515 eZDSP USB Stick Development Tool (which is available for lessthan $100), a microphone, speakers, and a music source such as an MP3 player, phone, or laptop.Undergraduate electrical engineering students were shown the demonstrations and were surveyedto determine if they found the demonstrations useful and which demonstrations they found mostinteresting. The C language source code for the software is available for free from the author foranyone who would like to run the demonstrations or to develop demonstrations for otheralgorithms.

Hoffbeck, J. P. (2015, June), Real-time Digital Signal Processing Demonstration Platform Paper presented at 2015 ASEE Annual Conference & Exposition, Seattle, Washington. 10.18260/p.24643

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