Consider the following cases where we want to determine different types of responses. (a) The input to a LTI system is x(t)= u(t) − 2u(t − 1) + u(t − 2)and the Laplace transform of the output is given by Y(s) = [(s+2)(1-e^(-s))^2]/[s(s+1)^2]. Determine the impulse response of the system. (b) Without computing the inverse of the Laplace transform X(s) = 1/[s(s^2+2s+10)] corresponding to a causal signal x(t), determine
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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.
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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.
Consider the following cases where we want to determine different types of responses.
(a) The input to a LTI system is x(t)= u(t) − 2u(t − 1) + u(t − 2)and the Laplace transform of the output is given by
Y(s) = [(s+2)(1-e^(-s))^2]/[s(s+1)^2]. Determine the impulse response of the system.
(b) Without computing the inverse of the Laplace transform X(s) = 1/[s(s^2+2s+10)] corresponding to a causal signal x(t), determine limt→∞x(t).
(c) The Laplace transform of the output of a LTI system is Z(s) = 1/[s((s+2)^2+1)], what would be the steady-state response zss(t)?
(d) The Laplace transform of the output of a LTI system is W(s) = e^(-s)/[s((s-2)^2+1)], how would you determine if there is a steady state or not? Explain.
(e) The Laplace transform of the output of a LTI system is V(s) = (s+1)/[s((s+1)^2+1)]. Determine the steady state and the transient responses corresponding to V(s).
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