Given a power spectrum (a plot of power vs. frequency), aliasing is a false translation of power falling in some frequency range (-f_c,f_c) outside the range. Aliasing is caused by discrete sampling below the Nyquist frequency. It can be minimized by either increasing the underlying sampling rate or (if that is not practical or possible) pre-filtering the signal to suppress high-frequency components.

See also

Antialiasing, Discrete Fourier Transform, Fast Fourier Transform, Leakage, Nyquist Frequency

Explore with Wolfram|Alpha


Blackman, R. B. and Tukey, J. W. "Aliasing" §12 in The Measurement of Power Spectra, From the Point of View of Communications Engineering. New York: Dover, pp. 31-33, 1959.Roberts, S. §in Lecture 7-The Discrete Fourier Transform.

Referenced on Wolfram|Alpha


Cite this as:

Weisstein, Eric W. "Aliasing." From MathWorld--A Wolfram Web Resource.

Subject classifications