R: Fade in and fade out of a time wave

fadew {seewave}

R Documentation

Fade in and fade out of a time wave

Description

This function applies a “fade in” and/or a “fade out” to a time wave following a linear, exponential or cosinus-like shape.

Usage

fadew(wave, f, channel = 1, din = 0, dout = 0, shape = "linear", 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).
`din`	fade in duration.
`dout`	fade out duration.
`shape`	fade shape, `"linear"`, `"exp"` for exponential, `"cos"` for cosinus-like, (by default `"linear"`).
`plot`	logical, if `TRUE` returns an oscillographic plot of the wave modified (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.

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

Examples

a<-noisew(d=5,f=4000)
op<-par(mfrow=c(3,1))
fadew(a,f=4000,din=1,dout=2,plot=TRUE,title="Linear",cexlab=0.8)
fadew(a,f=4000,din=1,dout=2,shape="exp",plot=TRUE,title="Exponential shape",
    colwave="blue",coltitle="blue",cexlab=0.8)
fadew(a,f=4000,din=1,dout=2,shape="cos",plot=TRUE,title="Cosinus-like shape",
    colwave="red",coltitle="red",cexlab=0.8)
par(op)

[Package seewave version 2.1.6 Index]