A brick-walllow-pass filter can remove the images and leave the original spectrum, thus recovering the original signal from the samples.
A brick-walllow-pass filter can remove the images and leave the original spectrum, thus recovering the original signal from the samples.
这种频谱的重叠导致的失真称为混叠，而重建出来的信号称为原信号的混叠替身，因为这两个信号有同样的样本值。