killDC | R Documentation |
Removes DC offset or similar disbalance in a waveform dynamically, by subtracting a smoothed ~moving average. Simplified compared to a true moving average, but very fast (a few ms per second of 44100 audio).
killDC(
sound,
windowLength = 200,
samplingRate = 16000,
windowLength_points = NULL,
plot = FALSE
)
windowLength |
the length of smoothing window, ms |
samplingRate |
sampling rate of |
windowLength_points |
the length of smoothing window, points. If
specified, overrides |
plot |
if TRUE, plots the original sound, smoothed moving average, and modified sound |
# remove static DC offset
a = rnorm(500) + .3
b = soundgen:::killDC(a, windowLength_points = 500, plot = TRUE)
# remove trend
a = rnorm(500) + seq(0, 1, length.out = 500)
b = soundgen:::killDC(a, windowLength_points = 100, plot = TRUE)
# can also be used as a high-pass filter
a = rnorm(500) + sin(1:500 / 50)
b = soundgen:::killDC(a, windowLength_points = 25, plot = TRUE)
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