dfreq {seewave} | R Documentation |
This function gives the dominant frequency (i. e. the frequency of highest amplitude) of a time wave.
dfreq(wave, f, wl, ovlp = 0, threshold = FALSE, plot = TRUE, xlab = "Times (s)", ylab = "Frequency (kHz)", ylim = c(0, f/2000), ...)
wave |
data describing a time wave. |
f |
sampling frequency of wave . |
wl |
length of the window for the analysis (even number of points). |
ovlp |
overlap between two successive analysis windows (in % ). |
threshold |
amplitude threshold for signal detection (in % ). |
plot |
logical, if TRUE plots the dominant frequency against time
(by default TRUE ). |
xlab |
title of the x axis. |
ylab |
title of the y axis. |
ylim |
the range of y values. |
... |
other plot graphical parameters. |
A Hanning function is applied to the analysis window.
If plot
is FALSE
, dfreq
function returns a vector of
numeric data corresponding to the dominant frequency along the time wave.
This function is based on fft
.
Jérôme Sueur jerome.sueur@univ-tours.fr
data(tico) dfreq(tico,f=22050,wl=512,ovlp=50,threshold=5) # overlay on spectrogram spectro(tico,f=22050,wl=512,ovlp=50,zp=16,scale=FALSE, collevels=seq(-40,0,1),palette=rev.terrain.colors) par(new=TRUE) dfreq(tico,f=22050,wl=512,ovlp=50,threshold=6,type="l",col="red",lwd=2, ann=FALSE,xaxs="i",yaxs="i")