.audSpectrogram | R Documentation |
Internal soundgen function.
.audSpectrogram(
audio,
step = 1,
dynamicRange = 80,
nFilters,
minFreq = 20,
maxFreq = audio$samplingRate/2,
minBandwidth = 1,
plot = TRUE,
osc = c("none", "linear", "dB")[2],
heights = c(3, 1),
ylim = NULL,
yScale = "bark",
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,
...
)
audio |
a list returned by |
step |
step, ms (determines time resolution). step = NULL means no downsampling at all (ncol of output = length of input audio) |
dynamicRange |
dynamic range, dB. All values more than one dynamicRange under maximum are treated as zero |
nFilters |
the number of filters (determines frequency resolution) |
minFreq, maxFreq |
the range of frequencies to analyze |
minBandwidth |
minimum filter bandwidth, Hz (otherwise filters may become too narrow when nFilters is high) |
plot |
should a spectrogram be plotted? TRUE / FALSE |
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 |
yScale |
scale of the frequency axis: 'linear' = linear, 'log' =
logarithmic (musical), 'bark' = bark with |
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 |
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.