wrassp (version 1.0.5)

forest: forest

Description

forest function adapted from libassp

Usage

forest(
  listOfFiles = NULL,
  optLogFilePath = NULL,
  beginTime = 0,
  endTime = 0,
  windowShift = 5,
  windowSize = 20,
  effectiveLength = TRUE,
  nominalF1 = 500,
  gender = "m",
  estimate = FALSE,
  order = 0,
  incrOrder = 0,
  numFormants = 4,
  window = "BLACKMAN",
  preemphasis = -0.8,
  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 data)

endTime

= <time>: set end of analysis interval to <time> seconds (default = 0: end of data)

windowShift

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

windowSize

= <dur>: set analysis window size to <dur> ms (default: 30.0)

effectiveLength

make window size effective rather than exact

nominalF1

= <freq>: set nominal F1 frequency to <freq> Hz (default: 500.0 Hz)

gender

= <code>: set gender specific parameters where <code> = f[emale], m[ale] or u[nknown] (when <code>=f: eff. window length = 12.5 ms nominal F1 = 560.0 Hz)

estimate

insert rough frequency estimates of missing formants (default: frequency set to zero)

order

decrease default order by 2 (one resonance less)

incrOrder

increase default order by 2 (one resonance more)

numFormants

= <num>: set number of formants to <num> (default: 4; maximum: 8 or half the LP order)

window

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

preemphasis

= <val>: set pre-emphasis factor to <val> (-1 <= val <= 0) (default: dependent on sample rate and nominal F1)

toFile

write results to file (default extension is .fms)

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

Formant estimation of the signal(s) in <listOfFiles>. Raw resonance frequency and bandwidth values are obtained by root-solving of the Linear Prediction polynomial from the autocorrelation method and the Split-Levinson-Algorithm (SLA). Resonances are then classified as formants using the so-called Pisarenko frequencies (by-product of the SLA) and a formant frequency range table derived from the nominal F1 frequency. The latter may have to be increased by about 12% for female voices (see NominalF1 and Gender options). Formant estimates will be written to a file with the base name of the input file and extension '.fms'. Default output is in SSFF binary format (tracks 'fm' and 'bw')

Examples

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

# calculate formant values
res <- forest(path2wav, toFile=FALSE)

# plot formant values
matplot(seq(0,numRecs.AsspDataObj(res) - 1) / rate.AsspDataObj(res) + 
          attr(res, 'startTime'), 
        res$fm, 
        type='l', 
        xlab='time (s)', 
        ylab='Formant frequency (Hz)')