Chapter Nine. Signal Tuning

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It is oftentimes necessary when processing a signal to move it from one region of the frequency spectrum to another region. This is especially true when processing communications signals, where a band limited signal centered at frequency f1 is tuned to another center frequency f2 in order to simplify downstream processing.

There are several synonymous terms that are commonly used to describe a signal whose spectrum has been moved from one center frequency to another. A signal whose spectrum has been moved is referred to as having been tuned, or it may be referred to as having been translated. In many cases when a signal’s ...

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