1- Find the Laplace transform and the corresponding ROC of the following signals. a) x(t) = [e-2t + e° cos(3t)]u(t) b)x(t) = e-altl = e-atu(t) + eatu(-t) , consider a>0. c) x(t) = 8(t) + 8(t – 1) + 8(t – 2)
Transfer function
A transfer function (also known as system function or network function) of a system, subsystem, or component is a mathematical function that modifies the output of a system in each possible input. They are widely used in electronics and control systems.
Convolution Integral
Among all the electrical engineering students, this topic of convolution integral is very confusing. It is a mathematical operation of two functions f and g that produce another third type of function (f * g) , and this expresses how the shape of one is modified with the help of the other one. The process of computing it and the result function is known as convolution. After one is reversed and shifted, it is defined as the integral of the product of two functions. After producing the convolution function, the integral is evaluated for all the values of shift. The convolution integral has some similar features with the cross-correlation. The continuous or discrete variables for real-valued functions differ from cross-correlation (f * g) only by either of the two f(x) or g(x) is reflected about the y-axis or not. Therefore, it is a cross-correlation of f(x) and g(-x) or f(-x) and g(x), the cross-correlation operator is the adjoint of the operator of the convolution for complex-valued piecewise functions.
![1- Find the Laplace transform and the corresponding ROC of the following
signals.
a) x(t) = [e¬2t + e' cos(3t)]u(t)
b)x(t) = e-altl = e-atu(t) + eatu(-t) , consider a>0.
c) x(t) = 8(t) + 8(t – 1) + 8(t – 2)
d) x(t) = u(-1) – u(1)
e) x(t) = e-3ª L, T sin(2t) u(t)dr
f) x(t) = L"„[7³ +sin(2t)]u(t)dr
g) x(t) = te-2t cos(5t) u(t – 1)
%3D
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2- Find the inverse of Laplace transform
Re[s]>-3
s-1
a)
s2(s+3)
b)
(s+1)(s-3)
s+5
i) Re[s]> 3 ii) Re[s]>-1 ii) Re[s]<3 iii) -1<Re[s]< 3
s+5
c)
Re[s]> 1
(s-1)(s+1)²'
s+5
i) Re[s]> 3 ii) Re[s]<1 i))<Re[s]< 2.
(s-1)(s-2)(s-3)'
3-Consider the LTI system with the input x(t) = e-'u(t) and the impulse
response h(t) = e-2tu(t).
a) Determine the Laplace transform of x(t) and h(t).
b) Using convolutional property, determine the Laplace transform of the output
y(t). Find the ROC for each case.
4- Consider the signal y(t) = x,(t – 2) * x2(-t + 3) where x, (t) = e-2'u(t)
and x2(t) = e-3lu(t). Determine the Laplace transform of y(t) using the
properties. Also find the ROC.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7474fb5e-6391-4bce-88e8-1f538c2a7470%2Fa0e2ef2f-2e68-4e87-aab0-ee16b1e118cc%2Fe8q7p4r_processed.png&w=3840&q=75)
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