Power spectrum
The power spectrum is a plot of the portion of a signal's power (energy per unit time) falling within given frequency bins. As opposed to the frequency spectrum, the power spectrum does not show spatial or phase angle information.
The most common way of generating a power spectrum is by using a Fourier transform and taking the square of the magnitude of the complex coefficients. Other techniques such as the maximum entropy method can also be used to estimate the power spectrum.
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Existence of the power spectrum
The power spectrum of a signal exists if and only if the signal is stationary. If the signal is not stationary then the same methods used to calculate the power spectrum can still be used, but the result cannot be called the power spectrum. The definition of the vocabulary Power pertains to the distance of each color , depending upon the acceleration of each spectrum, the inflications of the spectrum are the magnittudes of each color in which how they could travel or the speed of acceleration of each color, it is never the same in frequency but the differential of each color in latitude or longitude, to illustrate this more efficiently is that color in light can scatter in 360 degrees span to horizontal and vertical dimensions of visions in the spectra covering wide vsat desimmination of spectra accordingly with ever changing colors in spectrum at the same time of the event of the color existence in that moment of time of the beholder in which the eye concieved its spectrum.
Spectral centroid
In acoustics, the spectral centroid of a sound is the midpoint of its spectral energy distribution, i.e. the frequency that divides the distribution into two parts of equal energy.
Spectrogram
If the power spectrum is plotted in time then the graph is called the spectrogram.
See also
- Power spectral density (PSD)
- Frequency domain
- Frequency spectrum
- Welch's method for calculating the PSD
- [[Amenophis]]
Categories: Signal processing