afilter {seewave} | R Documentation |
This function deletes all signal which amplitude is below a selected threshold.
afilter(wave, f, threshold = 5, plot = TRUE, listen = FALSE, output = "matrix", ...)
wave |
an R object. |
f |
sampling frequency of wave (in Hz). Does not need to be specified if embedded in wave . |
threshold |
amplitude threshold (in %). |
plot |
logical, if TRUE plots the new oscillogram
(by default TRUE ). |
listen |
if TRUE the new sound is played back. |
output |
character string, the class of the object to return,
either "matrix" , "Wave" , "Sample" , "audioSample" or "ts" . |
... |
other oscillo graphical parameters. |
The threshold
value is in % relative to the maximal value
of wave
. Signal inferior to this value is clipped.
If plot
is FALSE
, a new wave is returned. The class
of the returned object is set with the argument output
.
This function is used as an argument (threshold
) in the
following functions: autoc
, csh
,
dfreq
, timer
and zc
.
Jerome Sueur sueur@mnhn.fr
data(orni) op<-par(mfrow=c(2,1)) afilter(orni,f=22050) title(main = "threshold level = 5") afilter(orni,f=22050,threshold=0.5,colwave="blue") title(main = "threshold level = 0.5") par(op)