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# lab4 - Joshua Manski EEE 304 Lab 4 Amplitude Modulation and...

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Joshua Manski EEE 304 – Lab 4 Amplitude Modulation and Demodulation Dr. Cihan Tepedelenlioglu November 24 th , 2009 Assignment 1 1.a- As the carrier frequency is moved from its minimum value to its max value (while the Messenger frequency is steady) changes result in the time and frequency domain of the Modulated signal. In time, the modulated signal’s time period becomes shorter; so that as carrier frequency rises, the Modulated signal’s frequency rises. In the frequency domain, the modulated signal moves farther away from the origin as the carrier frequency rises. 1.b-

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Front panel Assignment 1 Block diagram Assignment 1 1.c- i) Amplitude of Messenger signal = 2
ii) Amplitude of Messenger signal = 3 Front Panel 1.c.ii 1.d- When the Modulation Index is not equal to one, the reconstructed signal is not as good of a representative of the messenger signal. This is because when the Modulation Index is less than one, under-modulation occurs; and when µ is greater than one, over-modulation occurs. When µ>1 the reconstructed signal has the same frequency and shape but the amplitude rises. Also the frequency response gets disproportioned. When µ<1 the reconstructed signal’s frequency response partly grows in amplitude and the time domain shifts higher. Assignment 2

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lab4 - Joshua Manski EEE 304 Lab 4 Amplitude Modulation and...

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