Q.2 Consider the decaying exponential signal f(t) = Ae¯"u(t);a>0 -at 1 where r=- is caled the time constant of f(t). a a) Show that at time t= Nr x(Nr) =: e x(0) , ie., x(Nr)_ 1 x(1 + Nr) - and x(0) x(t) b) Now consider the sinusoidal signal with decaying exponential envelope: x(1) = {Ae" cos(2,f +9)}u(t) ; a>0. Give the relationship between the time period To of the sinusoidal signal and the time constant t of the exponential signal if x(T,) _ 1 x(107,) x(0) =0.01 . %3D x(0)

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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Q.2 Consider the decaying exponential signal
f (t) = Ae¯“u(t);a>0
where 7=- is called the time constant of f(t).
a
a) Show that at time t= NT x(Nt)=-
x(0)
x(Nr)
1
and
eN
, ie.,
x(t + N7)
1
%3D
%3D
e
x(0)
x(t)
eN
b) Now consider the sinusoidal signal with decaying exponential envelope:
x(1) = {Ae¯" cos(t +p)}u(t) ; a>0.
-at
Give the relationship between the time period To of the sinusoidal signal and the time constant
t of the exponential signal if
1 x(107,)
x(T,)
x(0)
- = 0.01 .
x(0)
%3D
e"
Transcribed Image Text:Q.2 Consider the decaying exponential signal f (t) = Ae¯“u(t);a>0 where 7=- is called the time constant of f(t). a a) Show that at time t= NT x(Nt)=- x(0) x(Nr) 1 and eN , ie., x(t + N7) 1 %3D %3D e x(0) x(t) eN b) Now consider the sinusoidal signal with decaying exponential envelope: x(1) = {Ae¯" cos(t +p)}u(t) ; a>0. -at Give the relationship between the time period To of the sinusoidal signal and the time constant t of the exponential signal if 1 x(107,) x(T,) x(0) - = 0.01 . x(0) %3D e"
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