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(ELEC211)06 Summer Midterm_sol.pdf
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1.


a)







b)





c)
















d)





e) (i) True (ii) False (iii) True


f)


r








g)



h)
2.
n +1

2

3

C1 0 1 k

n

1

1

C2

3

C1 0 1 n

C2

C1

1

C2

t

r(t)





a)

b)
(Time reversal property)


c) h



d) (i) No (ii) Yes (iii) Yes

e)






f)


g)


t

0



1

t

C0

1

t

C0

1

3.


a)






b)





c) F.S. coefficients of

where
and


for all k

d) The LPF will filter out the frequency components for | and only allow k = 0 to pass through.



which is a dc signal.



t

C3 C2 C1 0 1 2 3 4

1