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emuR

create_spectrogram_image_as_raster

Create spectrogram image as raster

Description

Create spectrogram image as raster

Usage

create_spectrogram_image_as_raster(
  audioFilePath,
  begin = 0,
  end = 0,
  windowSizeInSecs = 0.01,
  alpha = 0.16,
  lowerFreq = 0,
  upperFreq = 5000,
  window = "GAUSS",
  dynRangeInDB = 70,
  audioChannel = 1,
  preEmphasisFilterFactor = 0.97,
  invert = F
)

Arguments

audioFilePath

path to audio file to plot spectrogram of
begin

begin time in seconds (passed into begin parameter of wrassp::read.AsspDataObj)
end

end time in seconds (passed into end parameter of wrassp::read.AsspDataObj)
windowSizeInSecs

window size in seconds
alpha

value of spectrogram
lowerFreq

lower frequency limit of spectrogram
upperFreq

upper frequency limit of spectrogram
window

window type used in spectrogram calculation. Allowed values are:

  • "BARTLETT"

  • "BARTLETTHANN"

  • "BLACKMAN"

  • "COSINE"

  • "GAUSS" (the default)

  • "HAMMING"

  • "HANN"

  • "LANCZOS"

  • "RECTANGULAR"

  • "TRIANGULAR"

dynRangeInDB

dynamic range in DB of spectrogram
audioChannel

channel of audio file to draw spectrogram of (only applicable when using multi-chnanel audio files)
preEmphasisFilterFactor

used in time domain for amplifying high-freqs
invert

invert the colors of the spectrogram

Value

a image raster object

emuR

Main Package of the EMU Speech Database Management System

v2.2.0
GPL (>= 2)
Authors
Raphael Winkelmann [aut, cre], Klaus Jaensch [aut, ctb], Steve Cassidy [aut, ctb], Jonathan Harrington [aut, ctb]
Initial release

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