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Step functions can be used to define a window func- tion. Thus u 2) - u(t -3) defines a window 1 unit high and 5 units wide located on the time axis between-2 and 3. A function f(t) is defined as follows: f(t) = 0, 0sts 10s 5t 100, 10s st s 30 s 一一50 30 s St s 40 s; 2.5t-150 40 s S t s 60s 0 a) Sketch f(t) over the interval 0 s s t 3 60 s. b) Use the concept of the window function to write an expression for f (t)

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Step tunckens an be eder to cleliwe (D time anis beheer- and ie et) to Het) 0 tis) wie (i Lt)

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