Encyclopedia > Power spectrum

  Article Content

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 magnitude of the complex coefficients. Other techniques such as the maximum entropy method[?] can also be used to calculate the power spectrum.

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.

Information about the spectrum during time is called the spectrogram[?].



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Amphetamine Reptile Records

... of Flies, but eventually the label's roster expanded to include releases by Helmet, The Melvins and others. The label is best known for the Dope, Guns 'n' Fucking In The ...