Description Usage Arguments Value Examples
Prepares a spectral envelope for filtering a sound to add formants, lip radiation, and some stochastic component regulated by temperature. Formants are specified as a list containing time, frequency, amplitude, and width values for each formant (see examples). See vignette('sound_generation', package = 'soundgen') for more information.
1 2 3 4 5 6 7 8 9  getSpectralEnvelope(nr, nc, formants = NA, formantDep = 1,
formantWidth = 1, lipRad = 6, noseRad = 4, mouthAnchors = NA,
interpol = c("approx", "spline", "loess")[3], mouthOpenThres = 0.2,
openMouthBoost = 0, vocalTract = NULL, temperature = 0.05,
formDrift = 0.3, formDisp = 0.2, formantDepStoch = 20,
smoothLinearFactor = 1, samplingRate = 16000, speedSound = 35400,
plot = FALSE, duration = NULL, colorTheme = c("bw", "seewave",
"...")[1], nCols = 100, xlab = "Time", ylab = "Frequency, kHz",
...)

nr 
the number of frequency bins = windowLength_points/2, where windowLength_points is the size of window for Fourier transform 
nc 
the number of time steps for Fourier transform 
formants 
a character string like "aaui" referring to default presets
for speaker "M1"; a vector of formant frequencies; or a list of formant
times, frequencies, amplitudes, and bandwidths, with a single value of each
for static or multiple values of each for moving formants. 
formantDep 
scale factor of formant amplitude (1 = no change relative
to amplitudes in 
formantWidth 
= scale factor of formant bandwidth (1 = no change) 
lipRad 
the effect of lip radiation on source spectrum, dB/oct (the default of +6 dB/oct produces a highfrequency boost when the mouth is open) 
noseRad 
the effect of radiation through the nose on source spectrum,
dB/oct (the alternative to 
mouthAnchors 
mouth opening (0 to 1, 0.5 = neutral, i.e. no modification) (anchor format) 
interpol 
the method of smoothing envelopes based on provided mouth anchors: 'approx' = linear interpolation, 'spline' = cubic spline, 'loess' (default) = polynomial local smoothing function. NB: this does NOT affect the smoothing of formant anchors 
mouthOpenThres 
open the lips (switch from nose radiation to lip
radiation) when the mouth is open 
openMouthBoost 
amplify the voice when the mouth is open by

vocalTract 
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 
temperature 
hyperparameter for regulating the amount of stochasticity in sound generation 
formDrift 
scale factor regulating the effect of temperature on the depth of random drift of all formants (userdefined and stochastic): the higher, the more formants drift at a given temperature 
formDisp 
scale factor regulating the effect of temperature on the irregularity of the dispersion of stochastic formants: the higher, the more unevenly stochastic formants are spaced at a given temperature 
formantDepStoch 
the amplitude of additional formants added above the highest specified formant (only if temperature > 0) 
smoothLinearFactor 
regulates smoothing of formant anchors (0 to +Inf)
as they are upsampled to the number of fft steps 
samplingRate 
sampling frequency, Hz 
speedSound 
speed of sound in warm air, cm/s. Stevens (2000) "Acoustic phonetics", p. 138 
plot 
if TRUE, produces a plot of the spectral envelope 
duration 
duration of the sound, ms (for plotting purposes only) 
colorTheme 
black and white ('bw'), as in seewave package ('seewave'), or another color theme (e.g. 'heat.colors') 
nCols 
number of colors in the palette 
xlab, ylab 
labels of axes 
... 
other graphical parameters passed on to 
Returns a spectral filter (matrix nr x nc, where nr is the number of frequency bins = windowLength_points/2 and nc is the number of time steps)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38  # [a] with F1F3 visible
e = getSpectralEnvelope(nr = 512, nc = 50,
formants = soundgen:::convertStringToFormants('a'),
temperature = 0, plot = TRUE)
# image(t(e)) # to plot the output on a linear scale instead of dB
# some "wiggling" of specified formants plus extra formants on top
e = getSpectralEnvelope(nr = 512, nc = 50,
formants = soundgen:::convertStringToFormants('a'),
temperature = 0.1, formantDepStoch = 20, plot = TRUE)
# a schwa based on the length of vocal tract = 15.5 cm
e = getSpectralEnvelope(nr = 512, nc = 50, formants = NA,
temperature = .1, vocalTract = 15.5, plot = TRUE)
# no formants at all, only lip radiation
e = getSpectralEnvelope(nr = 512, nc = 50,
formants = NA, temperature = 0, plot = TRUE)
# mouth opening
e = getSpectralEnvelope(nr = 512, nc = 50,
vocalTract = 16, plot = TRUE, lipRad = 6, noseRad = 4,
mouthAnchors = data.frame(time = c(0, .5, 1), value = c(0, 0, .5)))
# scale formant amplitude and/or bandwidth
e = getSpectralEnvelope(nr = 512, nc = 50,
formants = soundgen:::convertStringToFormants('a'),
formantWidth = 2, formantDep = .5,
temperature = 0, plot = TRUE)
# manual specification of formants
e = getSpectralEnvelope(nr = 512, nc = 50, plot = TRUE, samplingRate = 16000,
formants = list(f1 = data.frame(time = c(0, 1), freq = c(900, 500),
amp = 20, width = c(80, 50)),
f2 = data.frame(time = c(0, 1), freq = c(1200, 2500),
amp = 20, width = 100),
f3 = data.frame(time = 0, freq = 2900,
amp = 20, width = 120)))

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