wrassp (version 1.0.5)

rmsana: rmsana

Description

rmsana function adapted from libassp

Usage

rmsana(
  listOfFiles = NULL,
  optLogFilePath = NULL,
  beginTime = 0,
  centerTime = FALSE,
  endTime = 0,
  windowShift = 5,
  windowSize = 20,
  effectiveLength = TRUE,
  linear = FALSE,
  window = "HAMMING",
  toFile = TRUE,
  explicitExt = NULL,
  outputDirectory = NULL,
  forceToLog = useWrasspLogger,
  verbose = TRUE
)

Value

nrOfProcessedFiles or if only one file to process return AsspDataObj of that file

Arguments

listOfFiles

vector of file paths to be processed by function

optLogFilePath

path to option log file

beginTime

= <time>: set begin of analysis interval to <time> seconds (default = 0: begin of file)

centerTime

= <time>: set single-frame analysis with the analysis window centred at <time> seconds; overrules beginTime, endTime and windowShift options

endTime

= <time>: set end of analysis interval to <time> seconds (default: end of file)

windowShift

= <dur>: set analysis window shift to <dur> ms (default: 5.0)

windowSize

= <dur>: set analysis window size to <dur> ms; overrules effectiveLength option

effectiveLength

make window size effective rather than exact

linear

calculate linear RMS values (default: values in dB)

window

= <type>: set analysis window function to <type> (default: HAMMING)

toFile

write results to file (default extension is .rms)

explicitExt

set if you wish to override the default extension

outputDirectory

directory in which output files are stored. Defaults to NULL, i.e. the directory of the input files

forceToLog

is set by the global package variable useWrasspLogger. This is set to FALSE by default and should be set to TRUE is logging is desired.

verbose

display infos & show progress bar

Author

Raphael Winkelmann

Lasse Bombien

Details

Analysis of short-term Root Mean Square amplitude of the signal in <listOfFiles>. Per default, the RMS values are expressed in decibel (dB) so that they correspond to the short-term power of the signal. Analysis results will be written to a file with the base name of the input file and extension '.rms'. Default output is in SSFF binary format (track 'rms').

Examples

# get path to audio file
path2wav <- list.files(system.file("extdata", package = "wrassp"), 
                       pattern = glob2rx("*.wav"), 
                       full.names = TRUE)[1]

# calculate rms values
res <- rmsana(path2wav, toFile=FALSE)

# plot rms values
plot(seq(0,numRecs.AsspDataObj(res) - 1) / rate.AsspDataObj(res) +
       attr(res, 'startTime'),
     res$rms, 
     type='l', 
     xlab='time (s)', 
     ylab='RMS energy (dB)')