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Unformatted text preview: GEORGIA INSTITUTE OF TECHNOLOGY SCHOOL of ELECTRICAL and COMPUTER ENGINEERING ECE 2025 Spring 2009 Lab #8: Frequency Response and FIR Filter Design Date: 39 Mar. 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. The Warm-up section of each lab must be completed during your assigned Lab time and the steps marked Instructor Verification must also be signed off during the lab time by one of the laboratory instructors. After completing the warm-up section, turn in the verification sheet to your TA. It is only necessary to turn in Section 4 as the lab report for this lab. More information on the lab report for- mat can be found on t-square under the INFO link. Please label the axes of your plots and include a title and Figure number for every plot. In order to reduce orphan plots , include each plot as a figure embedded within your report. This can be done easily with MATLABs notebook capability. For more information on how to include figures and plots from MATLAB in your report file, consult the INFO link on t-square , or ask your TA for details. 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. A short informal lab report will be due after Spring Break , starting on Wednesday, 24-March. At that time the Tuesday lab sections will move to the end of the lab cycle. 1 Introduction The goal of this lab is to study the frequency response for FIR filters, which governs the response to inputs such as complex exponentials and sinusoids. You can use firfilt() , or conv() , to implement filters and freqz() to obtain the filters frequency response. 1 As a result, you should learn how to characterize a filter by knowing how it reacts to different frequency components in the input. Using the frequency response, it is possible to perform the process of filter design in order to produce filter coefficients that will provide a desired frequency response. 2 Pre-Lab This lab also introduces two practical filters: bandpass filters and nulling filters. Bandpass filters can be used to detect and extract information from sinusoidal signals, e.g., tones in a touch-tone telephone dialer. This lab also introduces a practical filter, the nulling filter. Nulling filters can be used to remove sinusoidal interference, e.g., jamming signals in a radar or communication system....
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