https://medjava.ro/ 2026-11-06T16:14:50+00:00 https://medjava.ro/ https://medjava.ro/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2026-11-06T14:19:08+00:00 Anonymous (anonymous@undisclosed.example.com) https://medjava.ro/doku.php?id=ps:cap0-baze&rev=1793974748&do=diff Cap 0 — Kit de supravietuire: semnale, sisteme, numere complexe, spectru ← inapoi la cuprins · Curs 2 (partea de inceput) · Carte: cap. 2 · Notite: p. 2–3 De ce capitolul asta?4 idei * un sistem liniar se poate analiza bucata cu bucata (superpozitie); * un numar complex = $e^{j\theta} = \cos\theta + j\sin\theta$$x(t)$$t \in \mathbb{R}$$x(n)$$n \in \mathbb{Z}$$s(x, y)$$s(t) = A\sin(2\pi f_0 t + \varphi)$$A$$f_0$$\varphi$$x(t) \rightarrow$$\rightarrow y(t)$$S$$$ S[a_1 x_1(t) + a_2 x_2(t)] = a… text/html 2026-11-06T14:19:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://medjava.ro/doku.php?id=ps:start&rev=1793974755&do=diff Procesarea Semnalelor — pregatire partial Materie: Cursurile 1–7 + jumatate din Cursul 8. Format: grile (intelegerea conceptelor) + o problema. Partialul = 20% din nota. Capitole # Capitol Cursuri Importanta Stare 0 Kit de supravietuire: numere complexe, Euler, ce e un spectru C2 baza gata 1 $s(t) = A_1\cos(2\pi f_1 t) + A_2\sin(2\pi f_2 t) + A_3\cos(2\pi f_3 t)$$y(t) = \cos(2\pi f_c t)\,(1 + s(t))$$W = 10$$f_c = 1000$$$ f_c = \frac{1}{2\pi RC}, \qquad |H(f_c)| = \frac{1}{\sqrt{2}}…