# medfreq

Median frequency

## Syntax

## Description

estimates the median normalized frequency `freq`

= medfreq(`x`

)`freq`

of the power
spectrum of a time-domain signal `x`

. To compute the power
spectrum, `medfreq`

uses the `periodogram`

function with a
rectangular window and a number of DFT points equal to the length of
`x`

.

specifies the frequency interval over which to compute the median frequency.
This syntax can include any combination of input arguments from previous
syntaxes, as long as the second input argument is either `freq`

= medfreq(___,`freqrange`

)`fs`

or `f`

. If the second input is passed as empty,
`medfreq`

assumes a normalized frequency. The default
value for `freqrange`

is the entire bandwidth of the input
signal.

`medfreq(___)`

with no output
arguments plots the PSD or power spectrum and annotates the median
frequency.

## Examples

## Input Arguments

## Output Arguments

## References

[1] Phinyomark, Angkoon, Sirinee
Thongpanja, Huosheng Hu, Pornchai Phukpattaranont, and Chusak Limsakul. "The Usefulness
of Mean and Median Frequencies in Electromyography Analysis." In
*Computational Intelligence in Electromyography Analysis – A Perspective
on Current Applications and Future Challenges*, edited by Ganesh R. Naik.
London: IntechOpen, 2012. https://doi.org/10.5772/50639.

## Extended Capabilities

## Version History

**Introduced in R2015a**

## See Also

`findpeaks`

| `meanfreq`

| `periodogram`

| `plomb`

| `pwelch`