Fourier transform windows
Generates different Fourier Transform windows.
ftwindow(wl, wn = "hamming",
correction = c("none", "amplitude", "energy"))wl |
window length |
wn |
window name: |
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"). |
A vector of length wl.
Try the example to see windows shape.
Jerome Sueur sueur@mnhn.fr
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.
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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.