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, Sample = FALSE,...)
wave |
data describing the time wave
or a Sample object generated loading a wav file
with loadSample (package sound). |
f |
sampling frequency of wave (in Hz).
Does not need to be specified if wave
is a Sample object. |
threshold |
amplitude threshold (in %). |
plot |
logical, if TRUE plots the new oscillogram
(by default TRUE ). |
listen |
if TRUE the new sound is played back. |
Sample |
if TRUE and plot is FALSE
returns an object of class Sample |
... |
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 as a one-column matrix
or as a Sample
object if Sample
is TRUE
.
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)