ELEG 3124 Lecture 3: SIGNALS ENERGY VS POWER / BASIC SIGNAL OPERATIONS / ELEMENTARY SIGNALS
29 Nov 2016
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Lec 3 signals energy vs power / basic signal. Assuming x(t) represent voltage across a resistor with resistance. Signal power: power of the signal measured at r = 1 ohm: p(t) = Determining if a signal is energy or power. Total energy: integral with limits of negative infinity to infinity of signal power. If , then x(t) is called an energy signal. If then x(t) is called a power signal. First test for energy equation since its simpler. The result is finite and above zero therefore it is an energy signal with average power of. It should be known that all periodic signals are power signals. Shifts the signal x(t) to the right by. Lecture notes page 3 is obtained by reflection x(t) with respect to the y-axis (t= Time scaling operation x(at) is obtained by scaling the signal x(t) in time. Different variations of the rectangular function can be described: Can be obtained by integrating the unit step function.
