# ftwindow: Fourier transform windows In seewave: Sound Analysis and Synthesis

 ftwindow R Documentation

## Fourier transform windows

### Description

Generates different Fourier Transform windows.

### Usage

``````ftwindow(wl, wn = "hamming",
correction = c("none", "amplitude", "energy"))
``````

### Arguments

 `wl` window length `wn` window name: `bartlett`, `blackman`, `flattop`, `hamming`, `hanning`, or `rectangle` (by default `hamming`). `correction` a character vector of length 1 to apply an amplitude ("amplitude") or an energy ("energy") correction to the FT window. By default no correction is applied ("none").

### Value

A vector of length `wl`.

### Note

Try the example to see windows shape.

### Author(s)

Jerome Sueur sueur@mnhn.fr

### References

Harris, F.J., 1978. On the use of windows for harmonic analysis with the discrete Fourier Transform. Proceedings of the IEEE, 66(1): 51-83.

`covspectro`, `dfreq`, `meanspec`, `spec`, `spectro`, `spectro3D`

### Examples

``````a<-ftwindow(512)
b<-ftwindow(512,wn="bartlett")
c<-ftwindow(512,wn="blackman")
d<-ftwindow(512,wn="flattop")
e<-ftwindow(512,wn="hanning")
f<-ftwindow(512,wn="rectangle")
all<-cbind(a,b,c,d,e,f)
matplot(all,type="l",col=1:6,lty=1:6)
legend(legend=c("hamming","bartlett","blackman","flattop","hanning","rectangle"),
x=380,y=0.95,col=1:6,lty=1:6,cex=0.75)
``````

seewave documentation built on Oct. 19, 2023, 5:07 p.m.