a) The impulse response of a LTI system is given as h(t) = ße¯t cos(Nj+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)=e*u(t) and g(t) = B cos(Q,t +g) = B cos2,(t+ Using the frequency convohtion property, or F(j0)*8(N±N,)=F(j[Q±Q,]) show that H(jN) = B- (a coso-N, sin g) +j(cosø)N (a+ jN)² +N; 1 F(jN) = a+ jN FcosD,)= πδ(Ω+Ω) + πδ(Ω-Ω,) Hint: To obtain the same result use also the time shifting property for cos(N,t + g) = cosN,(t+L). b) If H(jN)= 1-N°+ jN evahate a , B, q and N, and express h(t) using these vahes.

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Q.6
a) The impulse response of a LTI system is given as
h(t) = Beat cos(Nj+ø)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)
f(t) =e^«*u(t)
g(t) = B cos(2,t +ø) = ß cosN,(t+)
where
and
Using the frequency convohtion property, or
F(jQ)* 5(N±N,)=F(j[Q±N,]) show that
(a coso-2, sin g) + j(cos @)N
(a+ jN)² +Q;
H(jN) = B-
1
F(jN):
F{cosΩf) = πδ(Ω+Ω) + πδ(Ω -Ω,)
a+ jN
Hint: To obtain the same result use also the time shifting property for
cos (N,t + @) = cosN,(1+).
b) If
H(jN) =
1-Q² + jN
evahuate a , B, o and 2, and express h(t) using these vahes.
Transcribed Image Text:Q.6 a) The impulse response of a LTI system is given as h(t) = Beat cos(Nj+ø)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) f(t) =e^«*u(t) g(t) = B cos(2,t +ø) = ß cosN,(t+) where and Using the frequency convohtion property, or F(jQ)* 5(N±N,)=F(j[Q±N,]) show that (a coso-2, sin g) + j(cos @)N (a+ jN)² +Q; H(jN) = B- 1 F(jN): F{cosΩf) = πδ(Ω+Ω) + πδ(Ω -Ω,) a+ jN Hint: To obtain the same result use also the time shifting property for cos (N,t + @) = cosN,(1+). b) If H(jN) = 1-Q² + jN evahuate a , B, o and 2, and express h(t) using these vahes.
c)
Let the input to a contimuous-time LTI system with the transfer finction (fequency
response) H(jn) given in part (b) be of the form
1
4
x(t) =+-
1
cost +-cos 3t +-
25
1
cos 5t +
d)
Fill in the blanks (inchuding k) in the table bebw, showing every step of your
cakulations.
Transcribed Image Text:c) Let the input to a contimuous-time LTI system with the transfer finction (fequency response) H(jn) given in part (b) be of the form 1 4 x(t) =+- 1 cost +-cos 3t +- 25 1 cos 5t + d) Fill in the blanks (inchuding k) in the table bebw, showing every step of your cakulations.
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