add heaviside discret explanation
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@@ -4,10 +4,19 @@ Tableau des transformées en Z
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-----------
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| Nr. | $F_k$ | $F(z)$ | $f(t)$ | $F(s)$ |
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$$f[k] =\varepsilon[x]=\begin{cases}
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1^{x} &\text{ si } x\geq 0 \\
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0 &\text{ si } x<0
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\end{cases} \qquad \forall x=k,k-n
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$$
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$\varepsilon$ : fonction de Heaviside en discret
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----------
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| Nr. | $f[k]$ | $F(z)$ | $f(t)$ | $F(s)$ |
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|-----|-------------------|-----------------|-------------|--------|
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| 1 | $\delta_{k}, 0^k$ | 1 | $\delta(t)$ | 1 |
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| 2 | $1^k$ | $\frac{z}{z-1}$ | $u(t)$ | $\frac{1}{s-a}$ |
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| 2 | $1^k$ | $\frac{z}{z-1}$ | $u(t)$ | $\frac{1}{s-a}$ |
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