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Dirac Delta Function is defined as the function that its amplitude is zero everywhere except at zero where its amplitude is infinitely large such that the area under the curve is unity.

Sometimes it is used to describe a function consists of a sequence of samples such as:

[tex]g_{\delta}(t)=\sum_{n=-\infty}^{\infty}g(nT)\,\delta(t-nT)[/tex]

How this weighting affect the amplitude? I mean what is the amplitude of [tex]0.4\,\delta(t)[/tex]?

Regards