R: Remove the amplitude modulations of a time wave

rmam {seewave}

R Documentation

Remove the amplitude modulations of a time wave

Description

This functions removes the amplitude modulation of a time wave through the Hilbert amplitude envelope.

Usage

rmam(wave, f, channel = 1, plot = FALSE, listen = FALSE, output = "matrix", ...)

Arguments

`wave`	an R object.
`f`	sampling frequency of `wave` (in Hz). Does not need to be specified if embedded in `wave`.
`channel`	channel of the R object, by default left channel (1).
`plot`	logical, if `TRUE` returns an oscillographic plot of the nwe time wave (by default `FALSE`).
`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.

Details

The new time wave is obtained by dividing the original time wave by its Hilbert amplitude envelope.

Value

If plot is FALSE, a new wave is returned. The class of the returned object is set with the argument output.

Author(s)

Jerome Sueur sueur@mnhn.fr

References

Mbu Nyamsi, R. G., Aubin, T. & Bremond, J. C. 1994 On the extraction of some time dependent parameters of an acoustic signal by means of the analytic signal concept. Its application to animal sound study. Bioacoustics, 5: 187-203.

Examples

# generate a new sound with amplitude modulation
a<-synth(f=8000, d=1, cf=1500, am=c(50,10))
# remove the amplitude modulation and plot the result
rmam(a,f=8000,plot=TRUE)

[Package seewave version 2.1.6 Index]