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frequency spectrum
(redirected from Signal spectrum)

    Also found in: Wikipedia 0.02 sec.
frequency spectrum [′frē·kwən·sē ‚spek·trəm]
(physics)
A plot of the distribution of the intensity of some type of electromagnetic or acoustic radiation as a function of frequency.
(systems engineering)
In the analysis of a random function of time, such as the amplitude of noise in a system, the limit asTapproaches infinity of 1/(2πT) times the ensemble average of the squared magnitude of the amplitude of the Fourier transform of the function from -TtoT. Also known as power-density spectrum; power spectrum; spectral density.
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