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06.scd_muestreo_de_senales_continuas
1.
2.
3.
• •
4.
• • • ´ ´
5.
6.
7.
8.
9.
• •
10.
𝑻 𝑻 =
𝒏𝑻 𝑻: 𝒏 = 𝟎, 𝟏, 𝟐, 𝟑, … 𝒏𝑻′𝒔 : 𝒏𝑻 + 𝒓 − 𝒏𝑻 = 𝒄𝒐𝒏𝒔𝒕𝒂𝒏𝒕𝒆 𝒏𝑻 𝒏𝑻
11.
12.
𝑇 = 1 𝑓𝑠 𝑇 = 1 8000 𝑇
= 0.000125 s. • µ
13.
𝑓S 𝑓𝑚á𝑥 𝑓s > 2𝑓𝑚á𝑥
14.
• • •
15.
• • •
16.
17.
18.
19.
20.
21.
• 𝒙 𝒏
𝒙𝒏 𝒏 𝑛 • 𝟎 𝑛 𝑥𝑛 = 𝑥−2, 𝑥−1, 𝑥0,𝑥1,𝑥2,𝑥3 𝑥[𝑛] = 𝑥[𝑛 − 2], 𝑥[𝑛 − 1], 𝑥[𝑛], 𝑥[𝑛 + 1], 𝑥[𝑛 + 2]
22.
𝑥𝑛 = 3,8,9,10,6 𝑥𝑛
= 3−2, 8−1, 90, 101, 62 3 6 8 9 10 3 6 8 9 1 0 3 − 2 − 3 6 8 9 1 0 3 6 8 9 1 0 3 − 2 − 𝑛 𝑥𝑛
23.
1 𝛿[𝑛] = 1 →
𝑛 = 0 0 → 𝑛 ≠ 0 𝑢[𝑛] = ቊ 1 → 𝑛 ≥ 0 0 → 𝑛 < 0 𝑢[𝑛] 1 2 3 0 1 0 𝛿[𝑛]
24.
1 0 a 0 1
− a 𝑥[𝑛] 2 − 1 − 1 𝑛 1 − 2 − 𝑥 𝑛 = 𝑎𝑛 → −∞ ≤ 𝑛 ≤ ∞ 𝑛 2 − 1 − 0 𝑥[𝑛] 1 − 2 −
25.
𝑥[𝑛] = cos[𝑛]
+ sin[𝑛] 𝑥[𝑛] 𝑛
26.
• 𝑻 • • 𝒕 = 𝟎,
𝑻, 𝟐𝑻, … 𝑻
27.
• 𝒚(𝒕) 𝒙[𝒏𝑻] • 𝒚(𝒕) 𝒏𝑻
≤ 𝒕 ≤ 𝒏 + 𝟏 𝑻 𝝉 𝒚 𝒏𝑻 + 𝝉 = 𝒂𝒏𝝉𝒏 + 𝒂𝒏−𝟏𝝉𝒏−𝟏 + ⋯ + 𝒂𝟏𝝉 + 𝒂𝟎
28.
𝟎 ≤ 𝝉
≤ 𝑻 𝒚[𝒏𝑻] 𝒙[𝒏𝑻] 𝒚 𝑛𝑻 + 𝝉 = 𝒂𝒏𝝉𝒏 + 𝒂𝒏−𝟏𝝉𝒏−𝟏 + ⋯ + 𝒂𝟏𝝉 + 𝒙[𝒏𝑻]
29.
• •
30.
𝒏 = 𝟎 𝒚
𝒏𝑻 + 𝝉 = 𝒙[𝒏𝑻] 𝟎 ≤ 𝝉 ≤ 𝑻 𝒏 = 𝟎, 𝟏, 𝟐, … • • •
31.
𝒚 𝒕 𝒚[𝒏] ↓
𝑻
32.
33.
• 𝒙(𝒕) • 𝒚(𝒕)
34.
• •
35.
• 𝚫𝒕 → 𝟎 𝒕
= 𝒏𝑻 𝒚 𝒏 = 𝒚 𝒕 𝜹[𝒕 − 𝒏𝑻] 𝜹[𝒕 − 𝒏𝑻] •
36.
𝒚 𝒏 𝒚 𝒏
= 𝒚 𝟎 + 𝒚 𝟏 + 𝒚 𝟐 + ⋯ 𝒚 𝒏 = 𝒚 𝟎 𝜹[𝒕] + 𝒚[𝟏] 𝜹[𝒕 − 𝑻] + 𝒚[𝟏]𝜹[𝒕 − 𝟐𝑻] + ⋯ 𝒚 𝒏 = 𝒌=𝟎 ∞ 𝒚 𝒏𝑻 𝜹[𝒕 − 𝒏𝑻]
37.
𝑻 𝒖 𝒏 =
𝒖 𝟎 + 𝒖 𝟏 + 𝒖 𝟐 + ⋯ 𝒖[𝒕] = 𝒖[𝟎]𝜹[𝒕] + 𝒖[𝟏]𝜹[𝒕 − 𝑻] + 𝐮[𝟏]𝜹[𝒕 − 𝟐𝑻] + ⋯ 𝒖(𝒕) = 𝒏=𝟎 ∞ 𝒖[𝒏𝑻] 𝟏 𝒕 − 𝒏𝑻 − 𝟏(𝒏 − 𝒏 + 𝟏 𝑻
38.
𝓛 𝟏 𝒕
− 𝒏𝑻 = 𝒆−𝒏𝑻𝒔 𝒔 𝒖(𝒕) 𝓛{𝒖(𝒕)} = 𝓛 𝑛=𝟎 ∞ 𝒖(𝒏𝑻) 𝟏 𝒕 − 𝑛𝑻 − 𝟏(𝒕 − 𝒏 + 𝟏 𝑻 𝑼 𝒔 = 𝟏 − 𝒆−𝒏𝑻𝒔 𝒔 𝒏=𝟎 ∞ 𝒖[𝒏𝑻]𝒆−𝒏𝑻𝒔
39.
𝒁𝑶𝑯 𝒔 = 𝟏
− 𝒆−𝑻𝒔 𝒔
40.
t T 1 t T 1
t T 1 T 5 𝒖(𝒕)
41.
t T 1 t T 1
T 4 T 5 T 6 𝒖(𝒕)
42.
𝑻 𝒖 𝒕 =
𝒖 𝒏𝑻 + 𝒖[𝒏𝑻] − 𝒖[ 𝒏 − 𝟏 𝑻] 𝑻 [𝒕 − 𝒏𝑻] 𝒏𝑻 ≤ 𝒕 ≤ 𝒏 + 𝟏 𝑻 𝒏 = 𝟐, 𝟑, 𝟒, …
43.
𝑭𝑶𝑯 = 𝟏 +
𝒔𝑻 𝑻 𝟏 − 𝒆−𝒔𝑻 𝒔 𝟐 1 1 2 T 2T -1
44.
0 1T 3T
5T 7T t 𝑢(𝑡) 0 1T 3T 5T 7T t 𝑢(𝑡) 0 1T 3T 5T 7T t 𝑢[𝑛𝑇]
45.
0 2T 4T
6T 8T 10T t 𝒖[𝒏𝑻] 0 2T 4T 6T 8T 10T t 𝒖(𝒕) 0 2T 4T 6T 8T 10T t 𝒖(𝒕)