351Lab3 - Laboratory 3 SIGNAL PROCESSING IN LABVIEW...

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Laboratory 3 SIGNAL PROCESSING IN LABVIEW: FILTERING AND SPECTRAL ANALYSIS Time Aigbe Partners: Joe Harman Ugonna Madueke ENME 351 Section 0102 Date of Experiment: 9/25/07
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Time Aigbe ENME 351 – Sec 0102 Lab 3 Page 2 INTRODUCTION: In this lab, LabVIEW will be used to generate different types of signals and filtering and signal analysis will be performed on these inputs. Spectral analysis is the breaking down of an input signal into its frequency content (multiple frequencies within an input signal) in order to observe the signal strength at different frequencies. In real life situations, this can be used to decide what type of filter to use for a given input signal. Figure 1 shows various filters. These filters are designed to conduct frequency selectivity; passing signals within a band of frequencies and blocking frequencies outside of this band. These filters operate based off of responding to what is known as their cutoff frequency (f c in Figure 1). Figure 1: Several different types of filters OBJECTIVES: The objective of this lab was to learn how to use LabVIEW to perform a spectral analysis and observe how different filters can prevent different frequency inputs from becoming outputs. INSTRUMENTS: DELL computer LabVIEW 8.2 software DESCRIPTION OF EXPERIMENT AND EXPERIMENTAL SETUP: Exercise 3.1 – Spectral Analysis for Generated Signals For this exercise we created the program that can be seen in the block diagram in Figure 2 below. The intention of this circuit is to first generate three different types of signals (sinusoid, square wave, and triangular wave), then we took spectral measurements of these input signals in both linear and dB amplitude scales.
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Time Aigbe ENME 351 – Sec 0102 Lab 3 Page 3 Figure 2: Block Diagram for Exercise 3.1 Exercise 3.2 – Noise Filtering For this exercise we produced the block diagram shown in Figure 3. This program was created to produce both a 1V 100 Hz sinusoidal waveform and uniform white noise. The filter cutoff frequency was set above (and below for the next trial) the input frequency and
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This note was uploaded on 11/28/2010 for the course ENES enes100 taught by Professor Staff during the Spring '10 term at Maryland.

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351Lab3 - Laboratory 3 SIGNAL PROCESSING IN LABVIEW...

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