fade: Fade

In soundgen: Sound Synthesis and Acoustic Analysis

Fade

Description

Applies fade-in and/or fade-out of variable length, shape, and steepness. The resulting effect softens the attack and release of a waveform.

Usage

fade(
  x,
  fadeIn = 50,
  fadeOut = 50,
  fadeIn_points = NULL,
  fadeOut_points = NULL,
  samplingRate = NULL,
  scale = NULL,
  shape = c("lin", "exp", "log", "cos", "logistic", "gaussian")[1],
  steepness = 1,
  reportEvery = NULL,
  cores = 1,
  saveAudio = NULL,
  plot = FALSE,
  savePlots = NULL,
  width = 900,
  height = 500,
  units = "px",
  res = NA,
  ...
)

Arguments

x	path to a folder, one or more wav or mp3 files c('file1.wav', 'file2.mp3'), Wave object, numeric vector, or a list of Wave objects or numeric vectors
fadeIn, fadeOut	length of segments for fading in and out, ms (0 = no fade)
fadeIn_points, fadeOut_points	length of segments for fading in and out, points (if specified, override fadeIn/fadeOut)
samplingRate	sampling rate of x (only needed if x is a numeric vector)
scale	maximum possible amplitude of input used for normalization of input vector (only needed if x is a numeric vector)
shape	controls the type of fade function: 'lin' = linear, 'exp' = exponential, 'log' = logarithmic, 'cos' = cosine, 'logistic' = logistic S-curve
steepness	scaling factor regulating the steepness of fading curves (except for shapes 'lin' and 'cos'): 0 = linear, >1 = steeper than default
reportEvery	when processing multiple inputs, report estimated time left every ... iterations (NULL = default, NA = don't report)
cores	number of cores for parallel processing
saveAudio	full path to the folder in which to save audio files (one per detected syllable)
plot	if TRUE, produces an oscillogram of the waveform after fading
savePlots	full path to the folder in which to save the plots (NULL = don't save, ” = same folder as audio)
width, height, units, res	graphical parameters for saving plots passed to png
...	other graphical parameters

Value

Returns a numeric vector of the same length as input

See Also

crossFade

Examples

#' # Fading a real sound: say we want fast attack and slow release
s = soundgen(attack = 0, windowLength = 10,
             sylLen = 500, addSilence = 0)
# playme(s)
s1 = fade(s, fadeIn = 40, fadeOut = 350,
          samplingRate = 16000, shape = 'cos', plot = TRUE)
# playme(s1)

# Illustration of fade shapes
x = runif(5000, min = -1, max = 1)  # make sure to zero-center input!!!
# plot(x, type = 'l')
y = fade(x, fadeIn_points = 1000, fadeOut_points = 0, plot = TRUE)
y = fade(x, fadeIn_points = 1000, fadeOut_points = 1500,
         shape = 'exp', steepness = 1, plot = TRUE)
y = fade(x, fadeIn_points = 1500, fadeOut_points = 500,
         shape = 'log', steepness = 1, plot = TRUE)
y = fade(x, fadeIn_points = 1500, fadeOut_points = 500,
         shape = 'log', steepness = 3, plot = TRUE)
y = fade(x, fadeIn_points = 1500, fadeOut_points = 1500,
         shape = 'cos', plot = TRUE)
y = fade(x, fadeIn_points = 1500, fadeOut_points = 1500,
         shape = 'logistic', steepness = 1, plot = TRUE)
y = fade(x, fadeIn_points = 1500, fadeOut_points = 1500,
         shape = 'logistic', steepness = 3, plot = TRUE)
y = fade(x, fadeIn_points = 1500, fadeOut_points = 1500,
         shape = 'gaussian', steepness = 1.5, plot = TRUE)

## Not run: 
  fade('~/Downloads/temp', fadeIn = 500, fadeOut = 500, savePlots = '')

## End(Not run)

soundgen documentation built on Sept. 12, 2024, 6:29 a.m.