## Sampling

One of the most commonly misunderstood aspects of signal processing is the Nyquist-Shannon Sampling Theorem. It has been noted before that many engineers misunderstand the theorem, selecting sampling frequencies that are often too low, causing errors in systems design. An understanding of the underlying theory behind signal sampling is also useful to the communications engineer who wants a deeper understanding of the application of analog and digital filtering and information processing in communications equipment. The Need for Sampling Sampling analog,…