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Unformatted text preview: Lecture S20 Muddiest Points General Comments Today, we concluded our discussion of sampling. We talked about aliasing , which occurs when a signal is sampled below its Nyquist rate. We also had a short demo of the effects of aliasing, which causes music (or any other signal) to be distorted. Responses to Muddiest-Part-of-the-Lecture Cards (10 cards) 1. If in the signal [picture of spectrum X ( f ) with the higher frequency portions cut off ] you dont store information in the outer parts, would aliasing still be a problem? (1 student) Throwing away the outer portions does cause information loss, but if you dont limit the bandwidth of the sampled signal, aliasing will occur, which also destroy information. Passing the original signal through an antialiasing filter first ensures that at least the low frequency part of the signal can be reconstructed exactly. 2. When you show a signal graph like this [picture of spectrum of sampled signal with aliasing], what are the axes? (1) The graph in question is the spectrum (i.e., the The graph in question is the spectrum (i....
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- Fall '05