http://pel.es.hokudai.ac.jp/~akita/SignalAsDistribution.pdf26 9 12 [1] (signal processing) 4 4 [1] 4 4 δ f[n](n ∈ Z) T f(t) = ∞ ∑ i=−∞ f[i]δ(t − iT) (0.1) f(t)(t ∈ R) δ 1929 δ δ(x) = 0 (x ̸= 0) (0.2) ∫ ∞ −∞ δ(x)dx = 1 (0.3) 1 2 0.2 0.3 0 δ 1950 δ [2][3] [4] [5] [4] [4] [5] [4] [2] [3] 4 2 1 1 4 1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.2 . . . . . . . .
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