考虑以下8位长度的序列，其中n = 0，1，...，7,具有实值的8点DFT的是哪个序列（ ）？
A: {1 1 1 0 0 0 1 1}
B: {1 1 1 0 0 0 -1 -1}
C: {0 1 1 0 0 0 -1 -1}
D: {0 1 1 0 0 0 1 1}
A: {1 1 1 0 0 0 1 1}
B: {1 1 1 0 0 0 -1 -1}
C: {0 1 1 0 0 0 -1 -1}
D: {0 1 1 0 0 0 1 1}
举一反三
- 以下HDB3码中，哪些可以确定其中有误码 A: +1 0 0 0 -1 0 +1 -1 +1 0 0 +1 0 -1 +1 -1 0 0 -1 +1…… B: +1 0 0 -1 +1 0 0 0 +1 -1 0 0 -1 0 0 0 +1 0 0 +1 -1…… C: -1 0 0 0 -1 0 +1 0 0 0 +1 -1 +1 0 0 +1 0 0 -1 +1…… D: -1 0 +1 0 0 0 -1 +1 0 0 0 +1 -1 +1 -1 0 0 -1 +1 0 -1……
- 将二进制序列编为HDB3码,其中输出正电平用“+1”表示,负电平用“-1”表示,信息代码100000000011编码后表示为( ) A: +1 -1 0 0 +1 -1 0 0 -1 0 +1<br/>-1 B: +1 0 0 0 +1 -1 0 0 -1 0 +1 -1 C: -1 0 0 0 +1 -1 0 0 -1 0 +1 -1 D: +1 0 0 0 +1 -1 0 0 +1 0 -1 +1
- 对HDB3码-1000+100-1000-1+1000+1-1+1-100-1+1-1进行译码，结果是（ ）。 A: 1 0 0 0 1 0 0 1 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 1 1 B: 1 0 0 0 1 0 0 1 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 0 1 C: 1 0 1 0 1 0 0 1 0 0 0 0 1 1 0 0 0 1 1 0 0 0 0 1 1 D: 1 0 0 0 1 0 0 1 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 1 1
- 编写程序，创建下列10*10的数组，数组边界全为1，里面全为0。 [[1 1 1 1 1 1 1 1 1 1] [1 0 0 0 0 0 0 0 0 1] [1 0 0 0 0 0 0 0 0 1] [1 0 0 0 0 0 0 0 0 1] [1 0 0 0 0 0 0 0 0 1] [1 0 0 0 0 0 0 0 0 1] [1 0 0 0 0 0 0 0 0 1] [1 0 0 0 0 0 0 0 0 1] [1 0 0 0 0 0 0 0 0 1] [1 1 1 1 1 1 1 1 1 1]]
- 已知逻辑函数式为 F = A B + B C,可列出真值表如表2中的是( ) A B C ① ② ③ ④ 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 0 0 0 0 1 0 1 0 0 1 1 0 1 1 0 1 0 0 0 0 0 1 0 0 0 0 0 1 1 0 1 1