What is Power spectrum?
The '''power spectrum''' of a [[signal]] is the [[Power (physics)|power]] or more simply the [[energy]] of the signal at each [[frequency]] that it contains. It can also be considered as the range or [[Spectrum|spectra]] of energy or power of the given signal derived from the signals' range of frequencies. For example, [[white noise]], which contains all frequencies at the same power, has a flat '''power spectrum'''. The '''power spectrum''' of the sound of the bottom key on a [[piano]] would have a high value at the [[frequency]] corresponding to its note, and low values elsewhere. {{science-stub}} [[Category:Electronics]]