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A physical voltage m(t) between a pair of wires modulates a carrier c(t) for transmission as...

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Electrical Engineering

A physical voltage m(t) between a pair of wires modulates acarrier c(t) for transmission as s(t). The system is DSB-PC AM.Part of the message’s spectrum is M(f) = 0.6*exp(j*20)*delta(f-96)+ 0.4*exp(j*45)*delta(f-104)+...

But this is not the whole spectrum, for if it were the wholespectrum, then m(t) would be complex, whereas physical voltagescannot be complex

given:

a) Write the whole spectrum M(f). Also, plot |M(f)| and argM(f).

b) Suppose that the carrier frequency is fc = 800 and that thedeviation constant is k = 0.4. Plot |S(f)| and arg S(f). Show yoursupporting work.

c) your solution included both sidebands of S(f). However, areboth sidebands of S(f) really required?

d) why can S(f) omit a sideband even though M(f) cannot? [Hint:like m(t), s(t) too is constrained to be real valued. Explainhowever why omitting a sideband does not make s(t) complex.]

Answer & Explanation Solved by verified expert
4.2 Ratings (522 Votes)
a Since is real b Since the system is DSBPC the modulated signal is writtenas where is the carrier amplitudeHence Given    See Answer
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