seewave (version 2.2.3)

ftwindow: Fourier transform windows

Description

Generates different Fourier Transform windows.

Usage

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

Value

A vector of length wl.

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").

Author

Jerome Sueur

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.

See Also

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)