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# Ch7-ä½œä¸šè§£ç­”-2010

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Unformatted text preview: Ch7À } ^ * ª È À 7-3 èª*ÐÙxE 4ô 27 7 x (n)^ È}Àª* 7-37 b7 1 7-3 7 -5 ¸ª E x Ù Ð * 7 -5 ;X À] }ª* 8 y ( nÂ ) Hwª*8“D¸s Á y (−1) = 0 • n 3 x(n) = u (n) − u (n − 5) 2 7-5 b Š E x Ù Ð * ª Á ˜ y ( n) = x ( n) + 3 x(n) = u (n) − u (n − 5) 1 y (n − 1) 3 y ( n) X 7-9 N E x Ù Ð * ª ` 7-9ˆ¸ 3 7-9 À ª * } ˆ 7-11_ 2 ª Á ‡ ° 8 _} ♠ ℵ ° ♠ ℑ 8 α −2=0 α =2 y ( n) = C • 2 n 1 1 y (0) = ‡ 8 C= °Áª* 2 2 1 y (n) = • 2n = 2n −1 2 ˜ ° Á 7-14 ‡ª y (n) = −5 y (n − 1) + n⊥ ℵ } ª* y (−1) = 0 ª 7-16 À }_ y (n) + 2 y (n − 1) + y (n − 2) = 3n⊥ ℵ } *♠ y (−1) = 0 y (0) = 0 _ À } 7 -17ª y ( n) + y (n − 2) = sin n⊥ ª} À* y (−1) = 0 y (−2) = 0 7-27 4 7-27 7-30 û 1 + ¨ Œ ì 5 á h( n ) n g ( n² ) ‡ * Á ª n2 Á * ´‡ (ª h( n² ) ‡ * Á ª g (n) Áª E x Ù Ð * 7 -32‹0 n y ( n) n h( n) n x( n) n y ( n) n 1 x(n) n h(n) 3ÚxE n “ ”@ E x Û y (n) Ø}Àª* ^ 7-32 a y (n) ‡Áª* ´ 7-32 b y (n) Ø‡Áª* µ 7-32 c 5 7-32 7-33 7 E x Û 7-33 @ h1 (n) n h2 (n) n h1 (n) = δ (n) − δ (n − 3) h2 (n) = (0.8) n u (n) x ( n) = u ( n) 1 y ( n) y (n) = [ x( n) ∗ h1 (n)] ∗ h2 (n) 2 y ( n) y (n) = x(n) ∗ [h1 (n) ∗ h2 (n)] 5 áìŒ¨+ 6 7-33 17 y (n) = [ x(n) ∗ h1 (n)] ∗ h2 (n) = 5(1 − 0.8n +1 )u ( n) − 5(1 − 0.8n − 2 )u (n − 3) 27 = 5(1 − 0.8n +1 )u ( n) − 5(1 − 0.8n − 2 )u (n − 3) ª D *“ ω ℑ 8♠ 17 * s ¸ 2Hℜ ...
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## This note was uploaded on 03/28/2011 for the course ELECTRICAL 30230104 taught by Professor Yongren during the Fall '11 term at Tsinghua University.

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Ch7-ä½œä¸šè§£ç­”-2010

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