June 14, 2015
June 14, 2015
June 17, 2015
Electrical and Computer
26.1306.1 - 26.1306.11
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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