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Unformatted text preview: impulse functions to represent these values. However, for convenience, we may simply use the so-called line spectrum as shown below. We sometimes also assume that the signal is real and use only the positive half after adding the negative half of the spectrum to the positive half, which is purely for convenience. It will not cause confusion as the related power spectrum is symmetric. For example, the follow are the one-sided and two-sided line spectrums for cos(2 f c t ). (Note that the average power of cos(2 f c t ) is 0.5.) Please treat these as engineering convenience. In old days, without computer, drawing a plot is quite time-consuming. We want to save effort and use some notations that mathematicians may not like. -f c f f c 0.5 f f c 0.25...
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This note was uploaded on 01/11/2011 for the course EE 3008 taught by Professor Pingli during the Fall '08 term at City University of Hong Kong.
- Fall '08