Coherence between two time waves
This function returns the frequency coherence between two time waves.
coh(wave1, wave2, f, channel=c(1,1), plot =TRUE, xlab = "Frequency (kHz)", ylab = "Coherence", xlim = c(0,f/2000), type = "l",...)
wave1 |
a first R object. |
wave2 |
a second R object. |
f |
sampling frequency of |
channel |
channel of the R objects, by default left channel (1) for each object. |
plot |
logical, if |
xlab |
title of the frequency X-axis. |
ylab |
title of the coherence Y-axis. |
xlim |
range of frequency X-axis. |
type |
if |
... |
other |
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)
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