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Unformatted text preview: Lecture S16 Muddiest Points General Comments Today, we talked about the Fourier transforms of signals that are not stable, but are almost stable. These signals include constants, and sines and cosines. These signals are really important for understanding communication systems. Responses to Muddiest-Part-of-the-Lecture Cards (9 cards) 1. You never got to this in lecture . . . you mentioned last semester your device for measuring complex impedance, yet no complex signals exist. can you explain? (1 student) Sure. One way to do this is to apply a current, i ( t ), to the impedance to be measured, and then measure the voltage signal, v ( t ). Then the impedance is V ( j ) Z ( j ) = I ( j ) which makes sense if I ( j ) is not zero for any . Therefore, the measuring device must make sure that i ( t ) is an appropriate test current. Typically, this is done by using either a broadband, or white noise, process, or by using a swept sine signal....
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- Fall '05