getFormants: Get formants

In soundgen: Sound Synthesis and Acoustic Analysis

Get formants

Description

Internal soundgen function

Usage

getFormants(
  audio,
  windowLength = 50,
  step = 25,
  wn = "gaussian",
  zp = 0,
  dynamicRange = 80,
  silence = 0.04,
  formants = list(),
  nFormants = NULL
)

Arguments

audio	input sound as returned by readAudio
windowLength	length of FFT window, ms (multiple values in a vector produce a multi-resolution spectrogram)
step	you can override overlap by specifying FFT step, ms - a vector of the same length as windowLength (NB: because digital audio is sampled at discrete time intervals of 1/samplingRate, the actual step and thus the time stamps of STFT frames may be slightly different, eg 24.98866 instead of 25.0 ms)
wn	window type accepted by ftwindow, currently gaussian, hanning, hamming, bartlett, blackman, flattop, rectangle
zp	window length after zero padding, points
dynamicRange	dynamic range, dB. All values more than one dynamicRange under maximum are treated as zero
silence	(0 to 1 as proportion of max amplitude) frames with RMS amplitude below silence * max_ampl adjusted by scale are not analyzed at all.
formants	a list of arguments passed to findformants - an external function called to perform LPC analysis
nFormants	the number of formants to extract per STFT frame (0 = no formant analysis, NULL = as many as possible)

Details

A barebones version of analyze() that only measures formants. Called by formant_app()

Examples

data(sheep, package = 'seewave')
f = soundgen:::getFormants(soundgen:::readAudio(sheep, from = .1, to = .5))
f[11:15, 1:5]

soundgen documentation built on Aug. 8, 2025, 7:47 p.m.