November 2010
Intermediate to advanced
288 pages
8h 34m
English
book
Notes on Digital Signal Processing: Practical Recipes for Design, Analysis and Implementation
by C. Britton Rorabaugh
Content preview from Notes on Digital Signal Processing: Practical Recipes for Design, Analysis and Implementation
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Note 4. Practical Application of Ideal Sampling
This note shows how theoretical results from Note 3 are used to develop a practical sampling strategy that minimizes the effects of aliasing.
In the discussions of aliasing in Note 3, the frequency fH is portrayed as an absolute upper frequency. Prior to sampling, the signal of interest has zero spectral content at frequencies greater than fH. Under these conditions, sampling at rates greater than 2fH would result in no aliasing. However, this ideal situation is impossible to achieve in practical applications, where there will always be some aliasing. In many cases, even to achieve extremely low levels of aliasing, fH would have to be set so high that, in most cases, sampling at a rate of 2fH
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