Spectral edge frequency

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The spectral edge frequency or SEF is a measure used in signal processing. It is usually expressed as "SEF x", which stands for the frequency below which x percent of the total power of a given signal are located. (typically x is in the range 75 to 95.)

It is more particularly a popular measure used in EEG monitoring, in which case SEF has variously been used to estimate the depth of anesthesia.

See also[edit]


  • Drummond JC, Brann CA, Perkins DE, Wolfe DE: "A comparison of median frequency, spectral edge frequency, a frequency band power ratio, total power, and dominance shift in the determination of depth of anesthesia," Acta Anaesthesiol Scand. 1991 Nov;35(8):693-9.