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Comments on Why is the Linear Time-Invariant System (LTI) dominant in Signal processing?

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Why is the Linear Time-Invariant System (LTI) dominant in Signal processing?

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I just want to know why the Linear time-invariant(LTI) systems are a rich class in Signal Processing. Ofcourse there are different systems but still LTI is stressed a lot in academia. Is there any good reason for that? Also how well that system is used in professional signal processing? Please provide some practical insight.

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Pete W‭ wrote almost 4 years ago · edited almost 4 years ago

LTI works so well, it eventually takes almost no time to use. One can solve the "inside case" of many, many design problems using locally-linearized approximations, do this in like 20 minutes, and then spend days on analysis of obscure "edge cases". So it seems like all the time spent on more advanced effort goes into, perhaps, non-linear stuff, but that is really a sign of how effective LTI principles actually are.