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【简答题】
The table below lists the prices of chips and salsa for the months of October, November, and December. Assume that the typical consumer buys 8 bags of chips and 4 jars of salsa each month, and that October is the base period. a. Calculate the cost of a basket of goods for each month b. Calculate the consumer price index for November and December c. Calculate the inflation rate for November and December
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【单选题】在按时间抽取的快速傅里叶算法流程图中，需要将输入信号x[n]的序号按码位倒序的顺序排列，假设x[n] (n=0,1,2,…,15)为16点的输入序列，则下面x[n]的序号排序中，属于正确码位倒序排序的是（）
A.
x [0], x [8], x [4], x [12], x [2], x [10], x [6], x [14], x [1], x [9], x [5], x [13], x [3], x [11], x [7], x [15 ]
B.
x [0], x [8], x [4], x [2], x [12], x [10], x [6], x [14], x [1], x [9], x [5], x [3], x [13], x [11], x [7], x [15]
C.
x [15] , x [14] , x [13] , x [12] , x [11] , x [10] , x [9] , x [8] , x [7], x [6], x [5], x [4], x [3], x [2], x [1], x [0]
D.
x [14] , x [12] , x [10] , x [8] , x [6], x [4], x [2], x [0], x [15] , x [13] , x [11] , x [9] , x [7], x [5], x [3] , x [1]
【简答题】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(...
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