.getSurprisal  R Documentation 
Internal soundgen function called by getSurprisal
.
.getSurprisal(
audio,
step,
winSurp,
method = c("acf", "np")[1],
yScale = c("bark", "mel", "log")[1],
nFilters = 64,
dynamicRange = 80,
minFreq = 20,
maxFreq = audio$samplingRate/2,
plot = TRUE,
osc = c("none", "linear", "dB")[2],
heights = c(3, 1),
ylim = NULL,
contrast = 0.2,
brightness = 0,
maxPoints = c(1e+05, 5e+05),
padWithSilence = TRUE,
colorTheme = c("bw", "seewave", "heat.colors", "...")[1],
col = NULL,
extraContour = NULL,
xlab = NULL,
ylab = NULL,
xaxp = NULL,
mar = c(5.1, 4.1, 4.1, 2),
main = NULL,
grid = NULL,
width = 900,
height = 500,
units = "px",
res = NA,
...
)
step 
step, ms (determines time resolution). step = NULL means no downsampling at all (ncol of output = length of input audio) 
winSurp 
surprisal analysis window, ms (Inf = from sound onset to each point) 
method 
acf = change in maximum autocorrelation after adding the final
point, np = nonlinear prediction (see 
yScale 
scale of the frequency axis: 'linear' = linear, 'log' =
logarithmic (musical), 'bark' = bark with 
nFilters 
the number of filters (determines frequency resolution) 
dynamicRange 
dynamic range, dB. All values more than one dynamicRange under maximum are treated as zero 
minFreq, maxFreq 
the range of frequencies to analyze 
plot 
if TRUE, plots the auditory spectrogram and the

osc 
"none" = no oscillogram; "linear" = on the original scale; "dB" = in decibels 
heights 
a vector of length two specifying the relative height of the spectrogram and the oscillogram (including time axes labels) 
ylim 
frequency range to plot, kHz (defaults to 0 to Nyquist frequency). NB: still in kHz, even if yScale = bark, mel, or ERB 
contrast 
spectrum is exponentiated by contrast (any real number, recommended 1 to +1). Contrast >0 increases sharpness, <0 decreases sharpness 
brightness 
how much to "lighten" the image (>0 = lighter, <0 = darker) 
maxPoints 
the maximum number of "pixels" in the oscillogram (if any) and spectrogram; good for quickly plotting long audio files; defaults to c(1e5, 5e5) 
padWithSilence 
if TRUE, pads the sound with just enough silence to resolve the edges properly (only the original region is plotted, so the apparent duration doesn't change) 
colorTheme 
black and white ('bw'), as in seewave package ('seewave'),
or any palette from 
col 
actual colors, eg rev(rainbow(100))  see ?hcl.colors for colors in base R (overrides colorTheme) 
extraContour 
a vector of arbitrary length scaled in Hz (regardless of yScale!) that will be plotted over the spectrogram (eg pitch contour); can also be a list with extra graphical parameters such as lwd, col, etc. (see examples) 
xlab, ylab, main, mar, xaxp 
graphical parameters for plotting 
grid 
if numeric, adds n = 
width, height, units, res 
graphical parameters for saving plots passed to

... 
other graphical parameters 
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