351Lab2 - Laboratory 2 ANALOG AND DIGITAL SIGNAL CONVERSION...

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Laboratory 2 ANALOG AND DIGITAL SIGNAL CONVERSION, SAMPLING, AND ALIASING Time Aigbe Pete Mech Mike Kopanke ENME 351 Section 0102 Date of Experiment: 9/18/07
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OBJECTIVES: The objectives of this lab are to use LabVIEW to sample signals from a function generator and learn how analog to digital signal conversion works. In addition, we are supposed to learn about the Nyquist sampling frequency, aliasing, and the concept behind choosing the correct sampling frequency in order to gain enough information about the input signal. Based on the concept behind Nyquist frequencies (f sample =2f input ), it is necessary to understand that a sampling frequency, for analog to digital conversion, should never be lower than two times the input signal’s maximum frequency. If the sampling frequency is lower than two times the input signal’s maximum frequency, then aliasing occurs, and the output function will not correctly portray the input function after the analog to digital conversion has occurred. Likewise, the sampling period should be no greater than T sample , where T sample =1/(2f input ). In general, the higher the sampling frequency, the better the approximation of an input signal will be. In real life, analog to digital conversion might be needed for a the cruise control system in one’s car. The input signal would be the speedometer reading (an analog readout) and the output would have to be a digital signal in order for the cruise control system (a computer) to read and process it in binary. An engineering application of digital to analog conversion would include when audio signals stored in digital form need to be converted into analog signals so that they can be heard through speakers. INSTRUMENTS: DELL computer LabVIEW 8.2 software Connector Block Function Generator Oscilloscope Analog to Digital Converter (A/D or ADC) Digital to Analog Converter (D/A or DAC) National Instruments Data Acquisition Card DESCRIPTION OF EXPERIMENT AND EXPERIMENTAL SETUP: Exercise 2.1 – Analog to Digital and Digital to Analog Conversion To begin this exercise, several pieces of equipment needed to be connected. First the
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