Fpeak

Fpeak is a term used in several scientific and engineering disciplines to denote a peak value associated with a function, spectrum, or response. It is not defined by a single standard, and its exact meaning varies with context.

In signal processing and spectral analysis, Fpeak commonly refers to the frequency at which a spectrum—such as a power spectral density or magnitude spectrum—reaches its maximum. The peak frequency characterizes the dominant frequency content of a signal.

In systems and control engineering, Fpeak may indicate the peak gain of a frequency response, i.e., the maximum magnitude of a transfer function over frequency. This value is used to assess resonance and sensitivity.

In statistics or data analysis, some authors use Fpeak to describe the peak value of a function of interest, such as the maximum of an F-statistic curve over a parameter sweep, or the point of greatest statistical contrast in a model comparison. These uses are less standardized and depend on the methodological framework.

Because definitions vary, it is important to consult the source when interpreting Fpeak in a given work, including the data set, units, and the exact quantity being peaked. See also peak frequency, power spectral density, and transfer function.