An Interactive Guide To The Fourier Transform | BetterExplained: "Filters must be independent. The banana filter needs to capture bananas, and nothing else. Adding more oranges should never affect the banana reading. (Realistically, ingredients like milk and water have an overlap. Work with me here.)
Filters must be complete. We won't get the real recipe if we leave out a filter ("There were mangoes too!"). Our collection of filters must catch every last drop.
Ingredients must be combine-able. Smoothies can be separated and re-combined without issue (A cookie? Not so much. Who wants crumbs?). The cycle inputs, when separated and combined, need to behave the same (linearly)."
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