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Bandlimiting
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==Bandlimited signals== A '''bandlimited signal''' is a [[Signal (electronics)|signal]] that, in strict terms, has no energy outside a specific [[frequency]] range. In practical use, a signal is called bandlimited if the energy beyond this range is so small that it can be ignored for a particular purpose, like audio recording or radio transmission. These signals can be either random (unpredictable, also called [[Stochastic process|stochastic]]) or non-random (predictable, known as [[deterministic]]). In mathematical terms, a bandlimited signal relates to its [[Fourier series]] representation. Normally, a signal needs an infinite number of terms in a continuous Fourier series to describe it fully, but if only a finite number of terms are enough, the signal is considered bandlimited. This means its [[Fourier transform]] or [[spectral density]]—which show the signal’s frequency content—has "bounded support," meaning it drops to zero outside a limited frequency range.
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