Aliasing Square Wave

1. What is aliasing in Fourier Transform?
2. How do you explain aliasing?
3. What is aliasing in vibration?
4. What is aliasing of frequency spectrum?

What is aliasing in Fourier Transform?

Aliasing is the effect of new frequencies appearing in the sampled signal after reconstruction, that were not present in the original signal. It is caused by too low sample rate for sampling a particular signal or too high frequencies present in the signal for a particular sample rate.

How do you explain aliasing?

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 aliasing in vibration?

This phenomenon of formation of a lower-frequency wave due to under sampling is called aliasing. All data collectors/analyzers have automatically selected built-in sampling rates to ensure that no aliasing occurs. In theory, there should be no vibrations with frequencies of more than half of this sampling rate.

What is aliasing of frequency spectrum?

Those high frequencies fold back onto the spectrum of the discrete time series and appear as lower frequencies. The phenomenon that is caused by undersampling the continuous signal is termed frequency aliasing.