getEnv | R Documentation |
Returns the smoothed amplitude envelope of a waveform on the original scale. Unlike seewave::env, this function always returns an envelope of the same length as the original sound, regardless of the amount of smoothing.
getEnv(
sound,
windowLength_points,
method = c("rms", "hil", "peak", "raw", "mean")[1]
)
sound |
numeric vector |
windowLength_points |
the length of smoothing window, in points |
method |
'peak' for peak amplitude per window, 'rms' for root mean square amplitude, 'mean' for mean (for DC offset removal), 'hil' for Hilbert, 'raw' for low-pass filtering the actual sound |
a = rnorm(500) * seq(1, 0, length.out = 500)
windowLength_points = 50
scale = max(abs(a))
plot(a, type = 'l', ylim = c(-scale, scale))
points(soundgen:::getEnv(a, windowLength_points, 'rms'),
type = 'l', col = 'red')
points(soundgen:::getEnv(a, windowLength_points, 'peak'),
type = 'l', col = 'green')
points(soundgen:::getEnv(a, windowLength_points, 'hil'),
type = 'l', col = 'blue')
points(soundgen:::getEnv(a, windowLength_points, 'mean'),
type = 'l', lty = 3, lwd = 3)
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