Question

A continuous time signal is given by x(t) = 8cos(200t), how aliasing can be avoided for this signal?

Answer 1

$\boxed{Explained\:Answer}$

This is related to the Nyquist Sampling Rate is the lowestsampling rate that can be used without havingaliasing. The sampling rate for an analog signal must be at least two times the bandwidth of the signal.

So, for example, an audio signal with a bandwidth of 20 kHz must be sampled at least at 40 kHz to avoid aliasing.