Howtosignalprocessing
How can aliasing be avoided?
The solution to prevent aliasing is to band limit the input signals—limiting all input signal components below one half of the analog to digital converter's (ADC's) sampling frequency. Band limiting is accomplished by using analog low-pass filters that are called anti-aliasing filters.
What is sampling aliasing?
Aliasing occurs when a signal is sampled at an insufficient rate. Two different signals can become indistinguishable from each other when they are sampled – they are aliases of each other.
What is the effect of aliasing?
Aliasing is an undesirable effect that is seen in sampled systems. When the input frequency is greater than half the sample frequency, the sampled points do not adequately represent the input signal. Inputs at these higher frequencies are observed at a lower, aliased frequency.
