revw {seewave}R Documentation

Time reverse of a time wave

Description

Reverse the wave along the time axis.

Usage

revw(wave, f, env = TRUE, ifreq = TRUE, plot = FALSE, Sample = FALSE, ...)

Arguments

wave data describing a 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.
env logical, if TRUE the amplitude envelope is reversed.
ifreq logical, if TRUE the instantaneous frequency is reversed.
plot logical, if TRUE returns an oscillographic plot of the reversed wave (by default FALSE).
Sample logical, if TRUE and plot is FALSE returns an object of class Sample
... other oscillo graphical parameters.

Details

If plot is TRUE returns an oscillogram of the reversed wave. The amplitude and the instantaneous frequency can be independently reversed thanks to the arguments env and ifreq. See the examples.

Value

If plot is FALSE, a new wave is returned as a one-column matrix or as a Sample object if Sample is TRUE.

Author(s)

Jerome Sueur sueur@mnhn.fr

References

Beeman, K. 1998. Digital signal analysis, editing and synthesis in Hopp, S. L., Owren, M. J. and Evans, C. S. (Eds) 1998. Animal acoustic communication, pp. 59-103. Springer, Berlin, Heidelberg.

See Also

oscillo, addsilw, deletew, fadew, pastew, mutew

Examples

data(tico)
# simple reverse
revw(tico,f=22050,plot=TRUE)
# envelope reverse only
revw(tico,f=22050,ifreq=FALSE, plot=TRUE)
# instantaneous frequency reverse only
revw(tico,f=22050,env=FALSE, plot=TRUE)

[Package seewave version 1.5.0 Index]