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Capitolul 1: Semnale

Capitolul 1: Semnale

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<strong>Semnale</strong> discrete<br />

• Semnal discret: o funcţie x : Z → R<br />

• Mulţimea Z: timpul (discret)<br />

• x[n]: valoarea semnalului la momentul n (eşantionul n)<br />

• Abuz de notaţie: întreg semnalul este x[n] (n ∈ Z e variabilă<br />

liberă)<br />

2.5<br />

x[n]<br />

2<br />

1.5<br />

1<br />

... ...<br />

0.5<br />

0<br />

n<br />

−0.5<br />

−1<br />

−1.5<br />

−2<br />

−10 −8 −6 −4 −2 0 2 4 6 8 10<br />

PS cap. 1: <strong>Semnale</strong> – p. 2/43

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