One of the most important properties of linear time-invariant (LTI) systems is the superposition principle, which states that the overall response of an LTI system to a weighted sum of signals is simply the same weighted sum of the responses to each of the individual signals. In this "Lecture Notes" column, we will provide a deeper insight into this principle. In what follows, if the superposition principle has finitely many terms, it is called the weak superposition principle, whereas, if it has infinitely many terms, it is called the strong superposition principle (SSP).

中文翻译：

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线性时不变系统的叠加原理【讲义】

线性时不变 (LTI) 系统最重要的特性之一是叠加原理，它表明 LTI 系统对信号加权和的总体响应与对每个单独信号的响应的加权和相同信号。在这个“讲义”专栏中，我们将更深入地了解这一原则。下文中，如果叠加原理的项数是有限的，则称为弱叠加原理；如果项的项数是无限的，则称为强叠加原理（SSP）。