Discussion
A component above half the sampling rate reappearing as a lower frequency is called ______.
Answer: C
This is aliasing, and its defining property is that it cannot be undone, since the folded component occupies a frequency the wanted signal also uses. Quantisation is the rounding of a sample to a discrete level. Companding is the compression and expansion that improves small-signal resolution. And jitter is uncertainty in the timing of the sampling instants. Four impairments of a sampled system, each with a distinct cause and its own remedy.
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