The power spectrum is a representation of the distribution of power (or energy) across different frequencies in a signal. It is obtained by taking some form of the Fourier transform of the signal, such as the [[discrete Fourier transform (DFT)]], and then computing the squared magnitude of each frequency component. The resulting spectrum shows how much power is present at each frequency, allowing us to analyze the frequency content and characteristics of the signal. This power is often represented in [[deciBel|deciBels]]. The power spectrum is often represented in a graph with a logarithmic frequency scale. Other perceptually motivated frequency scales can also be used, such as the [[Bark frequency scale]] or the [[mel frequency scale]].