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the difference between the upper and lower frequencies in a contiguous set of frequencies

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Essential Bandwidth of rect(t/T)

Here is a question I have been trying to solve: Estimate the "essential bandwidth" of a rectangular pulse $$ g(t) = \operatorname{rect}\left(\frac{t}{T}\right), $$ with $T>0$, where this "essential" … bandwidth contains 90% of the rectangular pulse energy. …
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