**I**f the impulse response of an analog or continuous time system be *h*(*t*), it means that for an input *δ* (*t*) its output is *h* (*t*). Hence for linear system its output for a shifted impulse *δ* (*t* –*T*) is *h* (*t* –*T*). The following are the mathematical representation of these operations:

Obviously,

From last two statements, we can say that for an ...

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