Why do we call the rise/fall of a signal over time an "envelope" in DSP? I don't see a clear analogy there.

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@stephen Oooooo that explains it! I kept thinking it must have something to do with a classic envelope signal looking something like a letter envelope 🤦‍♂️

@jcmorrow great question, and i believe the answer is because of the metaphor of the back of a a paper envelope. it rises from the left, a point in the middle, and then it falls to the right. at least, this is what they taught me in my music electronic music production classes 15 years ago.

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