Internal soundgen function called by addFormants
.addFormants(
audio,
formants = NULL,
spectralEnvelope = NULL,
action = c("add", "remove")[1],
dB = NULL,
specificity = 1,
zFun = NULL,
vocalTract = NA,
formantDep = 1,
formantDepStoch = 1,
formantWidth = 1,
formantCeiling = 2,
lipRad = 6,
noseRad = 4,
mouthOpenThres = 0,
mouth = NA,
temperature = 0.025,
formDrift = 0.3,
formDisp = 0.2,
smoothing = list(),
windowLength_points = 800,
overlap = 75,
dynamicRange = 120,
normalize = c("max", "orig", "none")[1],
play = FALSE,
...
)a list returned by readAudio
either a character string referring to default presets for
speaker "M1" (implemented: "aoieu0") or a list of formant times,
frequencies, amplitudes, and bandwidths (see examples). NA or NULL means no
formants, only lip radiation. Time stamps for formants and mouthOpening can
be specified in ms relative to sylLen or on a scale of [0, 1]. See
getSpectralEnvelope for more details
(optional): as an alternative to specifying formant frequencies, we can provide the exact filter - a vector of non-negative numbers specifying the power in each frequency bin on a linear scale (interpolated to length equal to windowLength_points/2). A matrix specifying the filter for each STFT step is also accepted. The easiest way to create this matrix is to call soundgen:::getSpectralEnvelope or to use the spectrum of a recorded sound
'add' = add formants to the sound, 'remove' = remove formants (inverse filtering)
if NULL (default), the spectral envelope is applied on the original scale; otherwise, it is set to range from 1 to 10 ^ (dB / 20)
a way to sharpen or blur the spectral envelope (spectrum ^ specificity) : 1 = no change, >1 = sharper, <1 = blurred
(optional) an arbitrary function to apply to the spectrogram prior to iSTFT, where "z" is the spectrogram - a matrix of complex values (see examples)
the length of vocal tract, cm. Used for calculating formant
dispersion (for adding extra formants) and formant transitions as the mouth
opens and closes. If NULL or NA, the length is estimated
based on specified formant frequencies, if any (anchor format)
scale factor of formant amplitude (1 = no change relative
to amplitudes in formants)
the amplitude of additional stochastic formants added above the highest specified formant, dB (only if temperature > 0)
scale factor of formant bandwidth (1 = no change)
frequency to which stochastic formants are calculated, in multiples of the Nyquist frequency; increase up to ~10 for long vocal tracts to avoid losing energy in the upper part of the spectrum
the effect of lip radiation on source spectrum, dB/oct (the default of +6 dB/oct produces a high-frequency boost when the mouth is open)
the effect of radiation through the nose on source spectrum,
dB/oct (the alternative to lipRad when the mouth is closed)
open the lips (switch from nose radiation to lip
radiation) when the mouth is open >mouthOpenThres, 0 to 1
mouth opening (0 to 1, 0.5 = neutral, i.e. no modification) (anchor format)
hyperparameter for regulating the amount of stochasticity in sound generation
scaling factors for the effect of temperature on formant drift and dispersal, respectively
a list of parameters passed to
getSmoothContour to control the interpolation and smoothing
of contours: interpol (approx / spline / loess), loessSpan, discontThres,
jumpThres
length of FFT window, points
FFT window overlap, %. For allowed values, see
istft
"orig" = same as input (default), "max" = maximum possible peak amplitude, "none" = no normalization
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
other plotting parameters passed to spectrogram