Without understanding signal bandwidth and sampling, you'll have quite a time trying to understand how signals are digitized.
Without the ability to sample analog signals and convert them to digital data, we'd all still be making measurements with mechanical analog meters. While such meters sometimes have advantages over digital readouts, performing math on a signal would still require analog techniques: op-amps, resistors, and capacitors. But, unless the sampling of a signal is done properly, you can get all kinds of problems.
There are many application notes, web pages, books, and videos on analog signals and sampling. One such paper is Application note 3628, Mathematical Basics of Band-Limited Sampling and Aliasing from Maxim Integrated. This week's questions come from that paper. As always, answers appear on the last page.
1. Complete the sentence: A signal is said to be band limited if the amplitude of its spectrum goes to zero for all frequencies beyond some threshold called
- The center frequency
- The bandwidth
- The cutoff frequency
- The Nyquist frequency
- The sampling rate
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