Signal

Aliased Signal's Frequency

Aliased Signal's Frequency
  1. What is aliased frequency?
  2. How do you find aliased frequencies?
  3. What is an aliased signal?
  4. How does aliasing affect a signal?

What is aliased frequency?

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 find aliased frequencies?

where fN is the folding frequency, fs is the signal frequency, and m is an integer such that fa < fN. For example, suppose that fs = 65 Hz, fN = 62.5 Hz, which corresponds to 8-ms sampling rate. The alias frequency then is fa = |2 × 62.5 − 65| = 60 Hz.

What is an aliased signal?

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.

How does aliasing affect a signal?

In signal processing and related disciplines, aliasing is an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled.

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