Lab05s09 - GEORGIA INSTITUTE OF TECHNOLOGY SCHOOL of...

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Unformatted text preview: GEORGIA INSTITUTE OF TECHNOLOGY SCHOOL of ELECTRICAL and COMPUTER ENGINEERING ECE 2025 Spring 2009 Lab #5: A/D and D/A Conversion Date: 10–16 Feb. 2009 You should read the Pre-Lab section of the lab and do all the exercises in the Pre-Lab section before your assigned lab time. This Lab will be done entirely in-Lab. It will count 50 points. Your score will be based on the answers that you write on the Instructor Verification sheet. During this warm-up you should work alone. Forgeries and plagiarism are a violation of the honor code and will be referred to the Dean of Students for disciplinary action. You are allowed to discuss lab exercises with other students and you are allowed to consult old lab reports, but you cannot give or receive written material or electronic files. Your submitted work should be original and it should be your own work. 1 Introduction The objective of this lab is to study sampling and aliasing with sinusoids. We will use a MATLAB GUI for sampling and aliasing, called con2dis , which tracks an input sinusoid and its spectrum through A/D and D/A converters. This demo is part of the SP-First Toolbox. 2 Pre-Lab 2.1 Sampling and Aliasing GUI A primary objective of this lab is to study sampling and aliasing by using the con2dis GUI. If you have installed the SP-First Toolbox, you will already have this demo on the matlabpath . In Fig. 1 there are three signals: the input x.t/ , the discrete-time signal xOEnŁ which is a sampled version of x.t/ , and the output signal which is reconstructed from xOEnŁ . Each of these time signals has a spectrum, so there are six plots to study. Ideal C-to-D Converter Ideal D-to-C Converter x ( t ) x [ n ] y ( t ) f s = 1 T s f s = 1 T s Figure 1: Ideal sampling and reconstruction systems. An ideal C-to-D converter samples x.t/ with a sam- pling period T s D 1=f s to produce the discrete-time signal xOEnŁ . The ideal D-to-C converter then forms a continuous-time signal y.t/ from the samples xOEnŁ ....
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Lab05s09 - GEORGIA INSTITUTE OF TECHNOLOGY SCHOOL of...

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