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# Class Note for ECE 1100 with Professor Chen at UH

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This 8 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Houston taught by a professor in Fall. Since its upload, it has received 22 views.

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Date Created: 02/06/15
ECE 1100 Introduction to Electrical and Computer Engineering Fall 2008 Professor Ji Chen ECE Dept Notes 9 Sinusoidal Signals U 2 Basic Facts Sinusoidal waveforms waves that vary sinusoidally in time are the most important types of waveforms encountered in physics and engineering gt Most natural sources of radiation the sun etc emit sinusoidal waveforms gt Most humanmade systems produce sinusoidal waveforms AC generators microwave oscillators etc gt Most communications is done via sinusoidal waveforms that have been modulated either in an analog fashion such as AM or FM or digitally General Sinusoidal Waveform A amplitude of sinusoidal waveform a radian frequency of sinusoidal waveform radianss phase of sinusoidal signal radians Period of Sinusoidal Wave T W mU U In this example T 05 Frequency of Sinusoidal Wave a 1S a v0 m m m 05 U 10 15 ITS Units Hz cycles In this examplef 2 Hz cycless 1 scycle Radian Frequency vt i T ImUKJ 121 2 Acosat Since the cosine function repeats after 27r we have aT27z Radiam Frequency cont or Summary

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