Q.5 a) The impulse response of a LTI system is given as h(t) = ße¯d' cos(Nt+p)u(t); a>0. Consider h(t) to be the product of the two signals f(t) and g(t) such that h(t) = f (t)g (t) where f (t) =ed'u(t) and g(t) = B cos(2,t +p) = B cos2,(†+ Using the frequency convolution property, or F( jN)*8(N±Q)=F(j[N±Q,]) show that (a cos p-2, sin g)+ j(cos p)2 (a+ jN)² +N; H(jN) = B- 1 F(jQ) = F{cos Ω = πδ(Ω+Ω,) + πδ(Ω-Ω ) a + j2 Hint: To obtain the same result use also the time shifting property for cos (2,t +p) = cos2,(t+

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Q.5
a) The impulse response of a LTI system is given as
h(t) = ße¯ª cos(Ni+9)u(t); a>0.
Consider h(t) to be the product of the two signals f(t) and g(t) such that
h(t) = f (t)g (t)
where
f (t) =e¯d'u(t)
and
g(t) = B cos(2,t +@) = ß cos2,(t+
Using the frequency convolution property, or
F( jN)*5(N±Q,)=F(j[N±Q]) show that
(a cos p-2, sin ø)+ j(cos p)N
(a+ jN)² +N;
H(jN)= ß-
1
F(jN) =
F|cosΩ,) = πδ(Ω+Ω,) + πδ Ω-Ω,)
a + jN
Hint: To obtain the same result use also the time shifting property for
cos (2,t + p) = cos2,(t+
-).
b) If
H(jN) =
1-N²+ jN
evaluate a , ß, q and 2, and express h(t) using these values.
c)
Let the input to an LTI system with the transfer function given in part (b) be of the form
1
cos 5t +......
1
4
1
x(t)=
+
cost+
- cos 3t +
9.
25
Evaluate the first four terms of the Fourier series of the output y(t).
Transcribed Image Text:Q.5 a) The impulse response of a LTI system is given as h(t) = ße¯ª cos(Ni+9)u(t); a>0. Consider h(t) to be the product of the two signals f(t) and g(t) such that h(t) = f (t)g (t) where f (t) =e¯d'u(t) and g(t) = B cos(2,t +@) = ß cos2,(t+ Using the frequency convolution property, or F( jN)*5(N±Q,)=F(j[N±Q]) show that (a cos p-2, sin ø)+ j(cos p)N (a+ jN)² +N; H(jN)= ß- 1 F(jN) = F|cosΩ,) = πδ(Ω+Ω,) + πδ Ω-Ω,) a + jN Hint: To obtain the same result use also the time shifting property for cos (2,t + p) = cos2,(t+ -). b) If H(jN) = 1-N²+ jN evaluate a , ß, q and 2, and express h(t) using these values. c) Let the input to an LTI system with the transfer function given in part (b) be of the form 1 cos 5t +...... 1 4 1 x(t)= + cost+ - cos 3t + 9. 25 Evaluate the first four terms of the Fourier series of the output y(t).
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