Hãy xác định D F T [ x ˜ ( n − n 0 ) ] trong trường hợp sau. Nếu D F T [ x ˜ ( n ) ] = X ˜ ( k )

$\text{D}\text{F}\text{T}\left[\tilde{x}\left(n-n{}_0\right)\right]=W{}_N^{-kn{}_0}\cdot \tilde{X}\left(k\right)$

$\text{D}\text{F}\text{T}\left[\tilde{x}\left(n-n{}_0\right)\right]=W{}_N^{kn{}_0}\cdot \tilde{X}\left(k\right)$

$\text{D}\text{F}\text{T}\left[\tilde{x}\left(n-n{}_0\right)\right]=W{}_N^{n{}_0}\cdot \tilde{X}\left(k\right)$

$\text{D}\text{F}\text{T}\left[\tilde{x}\left(n-n{}_0\right)\right]=W{}_N^{n{}_0}\cdot \tilde{X}\left(-k\right)$