When is aliasing a good thing?

1. Under what conditions does aliasing occur?
2. What is the main condition to avoid aliasing?
3. Why is aliasing important?
4. Is aliasing a good thing?

Under what conditions does aliasing occur?

Answer : Aliasing occurs when an oscilloscope does not sample the signal fast enough to construct an accurate waveform record. The signal frequency is misidentified, and the waveforms displayed on an oscilloscope become indistinguishable. Aliasing is basically a form of undersampling.

What is the main condition to avoid aliasing?

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.

Why is aliasing important?

Aliasing is a very important phenomenon which highly influences the digital signal processing area. It is tightly coupled with the notion of sampling and sampling rate.

Is aliasing a good thing?

Aliasing can indeed be a good thing under certain conditions. Look at it this way: lets say your sampling rate is 100 Hz. Lets also say you have a signal somewhere out there, that is sitting from, say, 990 to 1010 Hz. (So its total bandwidth is 20 Hz, and it is centered at 1000 Hz).