700+ câu Trắc nghiệm Xử lý số liệu tín hiệu đáp án - Phần 9

$\delta \left(n+4\right)$

$\text{u}\left(\text{n}\right)$

$u\left(n+3\right)$

$x\left(n\right)=\left\{0,\underset{\_}{2},2,-1,0\right\}$

$X\left(Z\right)=2Z{}^{-2}Z\ne 0$

$X\left(Z\right)=2Z{}^{-2}Z\ne \infty$

$X\left(Z\right)=2Z{}^{2}Z\ne 0$

$X\left(Z\right)=3+4Z{}^1$

$X\left(Z\right)=3+4Z{}^{-1}Z\ne \infty$

$X\left(Z\right)=3+4Z{}^{-1}$

$X\left(Z\right)=2Z{}^2+3+4Z{}^{-1}Z\ne 0,Z\ne \infty$

$X\left(Z\right)=3+4Z{}^{-1}Z\ne 0$

$X\left(Z\right)=2Z{}^{-2}+3+4Z{}^{-1}Z\ne 0,Z\ne \infty$

$X\left(Z\right)=3+4Z{}^{-1}+2Z{}^2$

$X{}^{+}\left(Z\right)=3+Z{}^{-1}Z\ne 0$

$X\left(Z\right)=Z{}^1+3+4Z{}^{-1}Z\ne 0$

$X\left(Z\right)=Z{}^{-2}+1+1Z{}^{-1}Z\ne 0$

$X\left(Z\right)=3+Z{}^{-1}+2Z{}^2$

$X{}^{+}\left(Z\right)=3+Z{}^{-4}Z\ne 0$

$X+\left(Z\right)=3Z\ne 0$

$X\left(Z\right)=4Z{}^4+3Z\ne 0$

$X\left(Z\right)=4Z{}^{-4}-3$

$\frac{1}{1-2Z{}^{-1}}$ ROC. $\left|Z\right|>2$

$\frac{-1}{1+2Z{}^{-1}}$ ROC. $\left|Z\right|>2$

$\frac{-1}{1-2Z{}^{-1}}$ ROC. $\left|Z\right|>2$

$\frac{1}{1+2Z{}^{-1}}$ ROC. $\left|Z\right|>2$

$\text{Z}{}_0=0,\text{Z}{}_{\text{p}}=0.8$

$\text{Z}{}_0=0.8,\text{Z}{}_{\text{p}}=0$

$Z{}_0=0,Z{}_p=-0.8$

$\text{Z}{}_0=-0.8,\text{Z}{}_{\text{p}}=0$

$\text{Z}{}_{01}=0,\text{Z}{}_{02}=0.25;\text{Z}{}_{\text{p}1}=1.5,\text{Z}{}_{\text{p}2}=-0.5$

$\text{Z}{}_{01}=0,\text{Z}{}_{02}=-0.25;\text{Z}{}_{\text{p}1}=1.5,\text{Z}{}_{\text{p}2}=-0.5$

$\text{Z}{}_{01}=0,\text{Z}{}_{02}=-0.25;\text{Z}{}_{\text{p}1}=-1.5,\text{Z}{}_{\text{p}2}=0.5$

$\text{Z}{}_{01}=0,\text{Z}{}_{02}=0.25;\text{Z}{}_{\text{p}1}=-1.5,\text{Z}{}_{\text{p}2}=0.5$

$\text{Z}{}_{01}=1;\text{Z}{}_{\text{p}1}=0,\text{Z}{}_{\text{p}2}=2$

$\text{Z}{}_{01}=0,;\text{Z}{}_{\text{p}1}=2,\text{Z}{}_{\text{p}2}=1$

$Z{}_{01}=1;Z{}_{p1}=0,Z{}_{p2}=-2$

$\text{Z}{}_{01}=0;\text{Z}{}_{\text{p}1}=-2,\text{Z}{}_{\text{p}2}=0$

$H\left(Z\right)=\sum _{n=-\infty }h\left(n\right)Z{}^{-n}$

$H\left(Z\right)=\sum _{n=0}h\left(n\right)Z{}^n$

$H\left(Z\right)=\sum _{n=0}h\left(n\right)Z{}^{-n}$

$H\left(Z\right)=\sum _{n=\infty }h\left(n\right)Z{}^n$

$H\left(Z\right)=\sum _{n=-\infty }h\left(n\right)Z{}^{-n}$

$H\left(Z\right)=\sum _{n=0}h\left(n\right)Z{}^n$

$H\left(Z\right)=\sum _{n=0}h\left(n\right)Z{}^{-n}$

$H\left(Z\right)=\sum _{n=n}h\left(n\right)Z{}^n$

$H\left(Z\right)=1-2Z{}^{-2}+4Z{}^{-4}$

$H\left(Z\right)=1-2Z{}^2+4Z{}^4$

$H\left(Z\right)=2Z{}^{-2}+4Z{}^{-4}$

$H\left(Z\right)=1+2Z{}^{-2}+4Z{}^{-4}$

$\text{u}\left(\text{n}\right)$

$-\text{u}\left(\text{n}\right)$

$u\left(-n-1\right)$

$-\text{u}\left(-\text{n}-1\right)$

$(0.5){}^{\text{n}}\text{u}\left(\text{n}\right)$

$(0.5){}^{\text{n}-1}\text{u}\left(\text{n}-1\right)$

$(0.5){}^{\text{n}}\text{u}\left(\text{n}-1\right)$

$(0.5){}^{\text{n}-1}\text{u}\left(\text{n}\right)$

$\text{y}\left(\text{n}\right)=\left\{\underset{\_}{0},0,6,2,4,0\right\}$

$y\left(n\right)=\left\{\underset{\_}{0},0,4,6,2,0\right\}$

$y\left(n\right)=\left\{\underset{\_}{0},1,2,6,4,0\right\}$

$y\left(n\right)=\left\{\underset{\_}{0},0,2,6,4,0\right\}$