lspec produces image files with spectrograms of whole sound files split into multiple
rows.
lspec(X = NULL, flim = c(0,22), sxrow = 5, rows = 10, collevels = seq(-40, 0, 1),
ovlp = 50, parallel = 1, wl = 512, gr = FALSE, pal = reverse.gray.colors.2,
cex = 1, it = "jpeg", flist = NULL, overwrite = TRUE, path = NULL, pb = TRUE,
fast.spec = FALSE, labels = "selec", horizontal = FALSE, song = NULL)'selection_table' object or any data frame with columns
for sound file name (sound.files), selection number (selec), and start and end time of signal
(start and end). If given, two red dotted lines are plotted at the
start and end of a selection and the selections are labeled with the selection number
(and selection comment, if available). Default is NULL.
A numeric vector of length 2 indicating the highest and lowest
frequency limits (kHz) of the spectrogram, as in
spectro. Default is c(0,22).
A numeric vector of length 1. Specifies seconds of spectrogram per row. Default is 5.
A numeric vector of length 1. Specifies number of rows per image file. Default is 10.
A numeric vector of length 3. Specifies levels to partition the amplitude range of the spectrogram (in dB). The more levels the higher the resolution of the spectrogram. Default is seq(-40, 0, 1).
Numeric vector of length 1 specifying % of overlap between two
consecutive windows, as in spectro. Default is 50. High values of ovlp
slow down the function but produce more accurate selection limits (when X is provided).
Numeric. Controls whether parallel computing is applied. It specifies the number of cores to be used. Default is 1 (i.e. no parallel computing).
A numeric vector of length 1 specifying the window length of the spectrogram, default is 512.
Logical argument to add grid to spectrogram. Default is FALSE.
Color palette function for spectrogram. Default is reverse.gray.colors.2. See
spectro for more palettes.
A numeric vector of length 1 giving the amount by which text (including sound file and page number) should be magnified. Default is 1.
A character vector of length 1 giving the image type to be used. Currently only "tiff" and "jpeg" are admitted. Default is "jpeg".
character vector or factor indicating the subset of files that will be analyzed. Ignored if X is provided.
Logical argument. If TRUE all selections will be analyzed again
when code is rerun. If FALSE only the selections that do not have a image
file in the working directory will be analyzed. Default is FALSE.
Character string containing the directory path where the sound files are located.
If NULL (default) then the current working directory is used.
Logical argument to control progress bar. Default is TRUE.
Logical. If TRUE then image function is used internally to create spectrograms, which substantially
increases performance (much faster), although some options become unavailable, as collevels, and sc (amplitude scale).
This option is indicated for signals with high background noise levels. Palette colors gray.1, gray.2,
gray.3, topo.1 and rainbow.1 (which should be imported from the package monitoR) seem
to work better with 'fast' spectograms. Palette colors gray.1, gray.2,
gray.3 offer
decreasing darkness levels.
Character string with the name of the column(s) for selection
labeling. Default is 'selec'. Set to NULL to remove labels.
Logical. Controls if the images are produced as horizontal or vertical pages. Default is FALSE.
Character string with the name of the column to used as a label a for higher
orgnization level in the song (similar to 'song_colm' in song_param). If supplied then lines above the selections belonging to the same
'song' are plotted. Ignored if 'X' is not provided.
image files with spectrograms of whole sound files in the working directory. Multiple pages can be returned, depending on the length of each sound file.
The function creates spectrograms for complete sound files, printing the name of the sound files and the "page" number (p1-p2...) at the upper right corner of the image files. If 'X' is supplied, the function delimits and labels the selections. This function aims to facilitate visual inspection of multiple files as well as visual classification of vocalization units and the analysis of animal vocal sequences.
Araya-Salas, M., & Smith-Vidaurre, G. (2017). warbleR: An R package to streamline analysis of animal acoustic signals. Methods in Ecology and Evolution, 8(2), 184-191.
# NOT RUN {
# Save to temporary working directory
# save sound file examples
data(list = c("Phae.long1", "Phae.long2","lbh_selec_table"))
writeWave(Phae.long1, file.path(tempdir(), "Phae.long1.wav"))
writeWave(Phae.long2, file.path(tempdir(), "Phae.long2.wav"))
lspec(sxrow = 2, rows = 8, pal = reverse.heat.colors, wl = 300, path = tempdir())
# including selections
lspec(sxrow = 2, rows = 8, X = lbh_selec_table, pal = reverse.heat.colors, overwrite = TRUE,
wl = 300, path = tempdir())
#check this floder
,tempdir()
# }
# NOT RUN {
# }
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