Lab 5 - Tufts University School of Engineering Department...

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Tufts University School of Engineering Department of Electrical and Computer Engineering ES3 - Introduction to Electrical Circuits Fall 2007 Lab Section: Tuesday 2:30 – 4:30 Experiment 5 Interfacing Circuits to Computers: Analog-to-Digital Conversion, Digital Filters, and Digital-to-Analog Conversion Name: xxxxx xxxxx@ tufts.edu Submitted to: xxx Experiment Performed: xxx Experiment Due: 12xxxx Lab Partners: xxxx
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Purpose The purpose of this lab was to learn how to interface electrical circuits to computers. In doing this an automated speaker tester that could evaluate the frequency response of a commercial speaker was created. In the second part of the lab, a digital filter was used to compensate for poor frequency response, thereby improving the performance that was measured by the tester. Introduction The main, overarching idea of this lab is that analog signals that are created using electricity have great potential for use when converted to digital data that can be stored on hard drives, CDs, and other media. This process is done through sampling. A discrete set of samples are taken of an analog signal, and the voltage at each time is converted to a binary number. This collection of binary numbers is then stored and used as information about the signal. This process is also reversible in a what is called analog-to-digital conversion. In this lab specifically, a program called MATLAB was used in order to create specific tones in the speaker. MATLAB is a very advanced program that we did not have any knowledge of. However, the tasks that needed to be performed on it were very simple and self-explanatory. Later in the lab, we needed a way to improve the quality of the sound by improving the digital filter. The notch frequency and the attenuation were adjusted in order to do this. While the notch frequency was the frequency of the filter, the attenuation was the reduction of the amplitude and intensity of the digital signal provided
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This note was uploaded on 03/31/2008 for the course ENGINEERIN ES3 taught by Professor Zatet during the Fall '07 term at Tufts.

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Lab 5 - Tufts University School of Engineering Department...

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