The periodic signal x(t) = cos(250πt)| is applied to an ideal filter as shown in the following figure. →y(t) x(t)- x(t) Ideal Filter The Fourier series of r(t) can be written as 2 4 4 = + cos(500πt) ㅠ 3π 15T 1. Find the time-domain output expression of y(t) if (a) The ideal filter blocks all frequencies past 200 Hz (b) The ideal filter passes only frequencies between 200 Hz and 400 Hz. (c) The ideal filter blocks all frequencies past 400 Hz. cos(1000πt) + 4 35T cos(1500πt) + ... 2. For transmission in analog communication system it is desired to limit the bandwidth to 700Hz. Compute how many terms in the fourier series will remain after this bandlimiting operation. Give their frequencies and fourier coefficients. 3. Compute the resulting signal power after bandlimiting
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.
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