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给定信号: 2n+5 - 4 ≤ n ≤ - 1 x(n)= 6 0 ≤ n ≤ 4 0 其它 (1) 画出 x(n) 序列的波形, 标上各序列值; (2) 试用延迟的单位脉冲序列及其加权和表示 x(n) 序列; ( 3 ) 令 x1(n)=2x(n - 2) , 试画出 x1(n) 波形; ( 4 ) 令 x2(n)=2x(n+2) , 试画出 x2(n) 波形; ( 5 ) 令 x3(n)=x(2 - n) , 试画出 x3(n) 波形。 2.
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A
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