2) You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos wc t, where m(t) is a signal band-limited to B Hz. Figure below shows a DSB-SC modulator available in the stock room. The carrier generator available generates not cos wc t, but cos3 wc t. M(f) km(t)cos³ wet m(t) A Filter f a B B cos³ wct a) Sketch the signal spectra at points a and b.(a:1,b:8) b) Is it possible to realize a DSB-SC modulator as in the figure above? (If yes) what kind of filter should be used? Comment on the bandwidth of the filter and the minimum and/or maximum frequencies that the filter should allow to pass. c) What is the minimum usable value of wc?

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2) You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos wc t, where
m(t) is a signal band-limited to B Hz. Figure below shows a DSB-SC modulator available in the stock
room. The carrier generator available generates not cos wc t, but cos3 wc t.
M(f)
km(t)cos³ w̟t
m(t)
A
Filter
b
f
-B
В
cos wct
a) Sketch the signal spectra at points a and b.(a:1,b:8)
b) Is it possible to realize a DSB-SC modulator as in the figure above? (If yes) what kind of filter
should be used? Comment on the bandwidth of the filter and the minimum and/or maximum
frequencies that the filter should allow to pass.
c) What is the minimum usable value of wc?
Transcribed Image Text:2) You are asked to design a DSB-SC modulator to generate a modulated signal km(t) cos wc t, where m(t) is a signal band-limited to B Hz. Figure below shows a DSB-SC modulator available in the stock room. The carrier generator available generates not cos wc t, but cos3 wc t. M(f) km(t)cos³ w̟t m(t) A Filter b f -B В cos wct a) Sketch the signal spectra at points a and b.(a:1,b:8) b) Is it possible to realize a DSB-SC modulator as in the figure above? (If yes) what kind of filter should be used? Comment on the bandwidth of the filter and the minimum and/or maximum frequencies that the filter should allow to pass. c) What is the minimum usable value of wc?
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