.shiftFormants: Shift formants per sound

Description

Internal soundgen function called by shiftFormants

Usage

.shiftFormants(
  audio,
  multFormants,
  freqWindow = NULL,
  spec = NULL,
  dynamicRange = 80,
  windowLength = 50,
  step = NULL,
  overlap = 75,
  wn = "gaussian",
  interpol = c("approx", "spline")[1],
  normalize = c("max", "orig", "none")[2],
  play = FALSE
)

Arguments

audio: a list returned by readAudio
multFormants: 1 = no change, >1 = raise formants (eg 1.1 = 10% up, 2 = one octave up), <1 = lower formants. Anchor format accepted (see soundgen)
freqWindow: the width of spectral smoothing window, Hz. Defaults to detected f0
spec: precomputed spectrogram
dynamicRange: dynamic range, dB. All values more than one dynamicRange under maximum are treated as zero
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)
overlap: overlap between successive FFT frames, %
wn: window type accepted by ftwindow, currently gaussian, hanning, hamming, bartlett, blackman, flattop, rectangle
interpol: the method for interpolating scaled spectra
normalize: "orig" = same as input (default), "max" = maximum possible peak amplitude, "none" = no normalization
play: if TRUE, plays the synthesized sound using the default player on your system. If character, passed to play as the name of player to use, eg "aplay", "play", "vlc", etc. In case of errors, try setting another default player for play