第4次作业讲è¯

第4次作业讲è¯

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Unformatted text preview: s ª Á4 ( J 2 .1 * Lª TI ( ÁJ H ( jω ) x(t ) = ôH 10 ak e jkπÁ t ( ∑ *ª J k = −10 y (t ) e jk π t → H ( jkπ )e jk π t y (t ) = 4 ∑ 1− k k = −4 5 k 1 − H ( jkπ ) = 5 0 k ≤4 k ≥5 ak e jk π t [email protected] 1 s ª Á4 X C 3.2 * ª Á sC X FS s (1) x(t ) = cos(2t ) + sin( 4t ) ( ) ( 1 j 2t 1 j 4t − j 4t − j 2t x(t ) = e + e + e −e T = π ω0 = 2 2 2j 1 1 a± 2 = ± a±1 = 2j 2 ( 2) y [email protected] E 2 x(t ) = E − 2 0<t < − T 2 ) T <t <0 2 2 s ª Á4 8 B 3.2 * ª Á sB 8 FS s (1) x(t ) = cos(2t ) + sin( 4t ) ( ) ( 1 j 2t 1 j 4t − j 4t − j 2t x(t ) = e + e + e −e T = π ω0 = 2 2 2j 1 1 a± 2 = ± a±1 = 2j 2 ( 2) y [email protected] E 2 x(t ) = E − 2 0<t < − T 2 ) T <t <0 2 3 * 1Ä ¯ 3 xp ª Ä ªs e * *ª8 ÁJ P122 s 3.1(2) P122 s 3.2(1)(2)(5) P123 s 3.5(1)(4)(5) P123 s 3.6(1) (2) [email protected] 4 ...
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This note was uploaded on 08/22/2011 for the course EE 201 taught by Professor Yhm during the Spring '05 term at Zhejiang University.

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