# Aliasing

The problem with sampling is that you lose information in the process. Two different functions and might get sampled and produce the same vector . For instance, suppose is a sine wave, and is the zero function, . These are two very different signals. But, with the sampling interval , we see that
so and get sampled to appear as the same vector , which happens to be the zero vector. This is called **aliasing**: one signal appears the same as another.