已知有限长序列x[n]={1,2,3,4,5},n=0,1,2,3,4,其5点DFT是X[k],则【图片】的5点离散傅里叶反变换IDFT即y[n]是序列()
A: y[n]={5,1,2,3,4},n=0,1,2,3,4
B: x[n]={0,1,2,3,4},n=0,1,2,3,4
C: y[n]={2,3,4,5,1},n=0,1,2,3,4
D: y[n]={1,2,3,4,5},n=0,1,2,3,4
A: y[n]={5,1,2,3,4},n=0,1,2,3,4
B: x[n]={0,1,2,3,4},n=0,1,2,3,4
C: y[n]={2,3,4,5,1},n=0,1,2,3,4
D: y[n]={1,2,3,4,5},n=0,1,2,3,4
举一反三
- 已知x(n)={1, 2, 3},y(n)={1, 2, 1},则x(n)*y(n)=________。(下划线表示n=0) A: {1, 4, 8, 8, 3} B: {1, 4, 8, 8, 3} C: {1, 4, 8, 8, 3} D: {1, 4, 8, 8, 3}
- 已知有限长序列x[n]={1,2,3,4,5}, n=0,1,2,3,4,其5点DFT是X[k],则[img=411x87]18034d4a4a53666.png[/img]的5点离散傅里叶反变换IDFT即y[n]是序列( ) A: y[n]={5,1,2,3,4}, n=0,1,2,3,4 B: x[n]={0,1,2,3,4}, n=0,1,2,3,4 C: y[n]={2,3,4,5,1}, n=0,1,2,3,4 D: y[n]={1,2,3,4,5}, n=0,1,2,3,4
- 有六组量子数: (1) n=3,l=1,m=-1;(2) n=3,l=0,m=0;(3) n=2,l=2,m=-1;(4) n=2,l=1,m=0;(5) n=2,l=0,m=-1;(6) n=2,l=3,m=2 其中正确的是( )。 A: (1)(3)(5) B: (2)(4)(6) C: (1)(2)(4) D: (1)(2)(3)
- 在下列六组量子数中,正确的是① n=3,l= 1,m=-1 ② n = 3,l= 0,m = 0③ n = 2,l= 2 ,m=-1 ④ n = 2, l = 1 ,m = 0 ⑤ n = 2,l = 0,m =-1 ⑥ n= 2,l = 3 , m= 2 A: (1),(2),(4) B: (2),(4),(6) C: (1),(2),(3) D: (1),(3),(5)
- 下面程序的功能是输出以下9阶方阵。请填空。 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 1 1 2 3 3 3 3 3 2 1 1 2 3 4 4 4 3 2 1 1 2 3 4 5 4 3 2 1 1 2 3 4 4 4 3 2 1 1 2 3 3 3 3 3 2 1 1 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 # include int main( ) { int a[10][10],n,i,j,m; scanf("%d",&n); if(n%2= =0) m=n/2; else( ); for(i=0;i m=n/2+1 n–i–1 n–i–1