25 Jun ECET345 Signals And Systems Homework #6
Name of Student _________________________________________
1. Find the z-transform x(z) of x(n) = . Hint: Follow the method used in the lecture for Week 6. Also, when evaluating the numerical value of a trig function, keep in mind that the arguments of trig functions are always in radians and not in degrees.
2. Find the system transfer function of a causal LSI system whose impulse response is given by
and express the result in positive powers of z. Hint: The transfer function is just the z-transform of impulse response. However, we must first convert the power of -0.5 from (n – 1) to (n – 2) by suitable algebraic manipulation.
3. Express the following signal, x(n), in a form such that z-transform tables can be applied directly. In other words, write it in a form such that the power of 0.25 is (n-1) and the argument of sin is also expressed with a (n-1) multiplier.
Hint: Express sin(n) as sin (
(n-1+1)) = sin (
(n-1) +
) and then expand using use the trig identity for Sin(A+B).
4. The transfer function of a system is given below. Find its impulse response in n-domain. Hint: First expand using partial fraction expansion and then perform its inversion using z-transform tables
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