seewave (version 1.7.0)

echo: Echo generator

Description

This function generate echoes of a time wave.

Usage

echo(wave, f, amp, delay, plot = FALSE,
listen = FALSE, output = "matrix", ...)

Value

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

Details

amp and delay should strictly have the same length corresponding to the number of desired echoes.

References

Stoddard, P. K. (1998). Application of filters in bioacoustics. In: Hopp, S. L., Owren, M. J. and Evans, C. S. (Eds), Animal acoustic communication. Springer, Berlin, Heidelberg,pp. 105-127.

See Also

synth

Examples

# generation of the input wave
a<-synth(f=11025,d=1,cf=2000,shape="tria",am=c(50,10),fm=c(1000,10,1000))
# generation of three echoes
# with respectively a relative amplitude of 0.8, 0.4, and 0.2
# and with a delay of 1s, 2s, and 3s  from the beginning of the input wave
aecho<-echo(a,f=11025,amp=c(0.8,0.4,0.2),delay=c(1,2,3))
# oscillographic output to see what we have generated
op<-par(mfrow=c(2,1))
oscillo(a,f=11025,title="Input signal")
oscillo(aecho,f=11025,colwave="blue",title="Signal with echoes",coltitle="blue")
par(op)
# another echo with time delays overlapping with the input wave
echo(a,f=11025,amp=c(0.4,0.2,0.4),delay=c(0.6,0.8,1.5),plot=TRUE)