Question

Consider a signal x(n) = {1,2,3,4}. The x[n] is up-sampled by a factor of 2 to obtain y(n). What is y(n)?​

Answer 1

Aliasing – from alias – is an effect that makes different signals indistinguishable when sampled. It also refers to the difference between a signal reconstructed from samples and the original continuous signal, when the resolution is too low.