coh {seewave} | R Documentation |
This function returns the frequency coherence between two time waves.
coh(wave1, wave2, f, plot =TRUE, xlab = "Frequency (kHz)", ylab = "Coherence", xlim = c(0,f/2000), type = "l",...)
wave1 |
data or a Sample object generated loading a wav
file with loadSample (package sound) describing a first time wave. |
wave2 |
data or a Sample object generated loading a wav
file with loadSample (package sound) describing a second time wave. |
f |
sampling frequency of wave1 and wave1 (in Hz).
Does not need to be specified if wave1 and/or wave2 are/is (a)
Sample object(s). |
plot |
logical, if TRUE plots the continuous coherence function
(by default TRUE ). |
xlab |
title of the frequency X-axis. |
ylab |
title of the coherence Y-axis. |
xlim |
range of frequency X-axis. |
type |
if plot is TRUE , type of plot that should be drawn.
See plot for details (by default "l" for lines). |
... |
other plot graphical parameters. |
Coherence is a frequency domain function computed to show the degree of a relationship between two signals. The value of the coherence function ranges between zero and one, where a value of zero indicates there is no causal relationship between the signals. A value of one indicates the existence of linear frequency response between the two signals. This can be used, for instance, to compare the input and output signals of a system.
When plot
is FALSE
, this coh
returns a two-column matrix, the
first column being the frequency axis in kHz (x-axis) and the second column being the coherence (y-axis).
This function is based on spec.pgram
.
Jerome Sueur sueur@mnhn.fr but this function
is based on spec.pgram
by Martyn Plummer, Adrian Trapletti and B.D. Ripley.
wave1<-synth(d=1,f=4000,cf=500) wave2<-synth(d=1,f=4000,cf=800) coh(wave1,wave2,f=4000)