Description Usage Arguments Details
Internal soundgen function.
1 2 3 4 5 6 7 8 9 10 11 12  generateHarmonics(pitch, glottisAnchors = 0, attackLen = 50,
nonlinBalance = 0, nonlinDep = 50, nonlinRandomWalk = NULL,
jitterDep = 0, jitterLen = 1, vibratoFreq = 5, vibratoDep = 0,
shimmerDep = 0, shimmerLen = 1, creakyBreathy = 0, rolloff = 9,
rolloffOct = 3, rolloffKHz = 3, rolloffParab = 0,
rolloffParabHarm = 3, rolloff_perAmpl = 3, temperature = 0.025,
pitchDriftDep = 0.5, pitchDriftFreq = 0.125, amplDriftDep = 5,
subDriftDep = 4, rolloffDriftDep = 3,
randomWalk_trendStrength = 0.5, shortestEpoch = 300, subFreq = 100,
subDep = 0, amplAnchors = NA, interpol = c("approx", "spline",
"loess")[3], overlap = 75, samplingRate = 16000, pitchFloor = 75,
pitchCeiling = 3500, pitchSamplingRate = 3500, dynamicRange = 80)

pitch 
a contour of fundamental frequency (numeric vector). NB: for computational efficiency, provide the pitch contour at a reduced sampling rate pitchSamplingRate, eg 3500 points/s. The pitch contour will be upsampled before synthesis. 
glottisAnchors 
anchors for specifying the proportion of a glottal cycle with closed glottis, % (0 = no modification, 100 = closed phase as long as open phase); numeric vector or dataframe specifying time and value (anchor format) 
attackLen 
duration of fadein / fadeout at each end of syllables and noise (ms): a vector of length 1 (symmetric) or 2 (separately for fadein and fadeout) 
nonlinBalance 
hyperparameter for regulating the (approximate) proportion of sound with different regimes of pitch effects (none / subharmonics only / subharmonics and jitter). 0% = no noise; 100% = the entire sound has jitter + subharmonics. Ignored if temperature = 0 
nonlinDep 
hyperparameter for regulating the intensity of subharmonics and jitter, 0 to 100% (50% = jitter and subharmonics are as specified, <50% weaker, >50% stronger). Ignored if temperature = 0 
nonlinRandomWalk 
a numeric vector specifying the timing of nonliner regimes: 0 = none, 1 = subharmonics, 2 = subharmonics + jitter + shimmer 
jitterDep 
cycletocycle random pitch variation, semitones (anchor format) 
jitterLen 
duration of stable periods between pitch jumps, ms. Use a low value for harsh noise, a high value for irregular vibrato or shaky voice (anchor format) 
vibratoFreq 
the rate of regular pitch modulation, or vibrato, Hz (anchor format) 
vibratoDep 
the depth of vibrato, semitones (anchor format) 
shimmerDep 
random variation in amplitude between individual glottal cycles (0 to 100% of original amplitude of each cycle) (anchor format) 
shimmerLen 
duration of stable periods between amplitude jumps, ms. Use a low value for harsh noise, a high value for shaky voice (anchor format) 
creakyBreathy 
hyperparameter for a rough adjustment of voice quality from creaky (1) to breathy (+1); 0 = no change 
rolloff 
basic rolloff from lower to upper harmonics, db/octave
(exponential decay). All rolloff parameters are in anchor format. See

rolloffOct 
basic rolloff changes from lower to upper harmonics
(regardless of f0) by 
rolloffKHz 
rolloff changes linearly with f0 by 
rolloffParab 
an optional quadratic term affecting only the first

rolloffParabHarm 
the number of harmonics affected by

rolloff_perAmpl 
as amplitude goes down from max to

temperature 
hyperparameter for regulating the amount of stochasticity in sound generation 
pitchDriftDep 
scale factor regulating the effect of temperature on the amount of slow random drift of f0 (like jitter, but slower): the higher, the more f0 "wiggles" at a given temperature 
pitchDriftFreq 
scale factor regulating the effect of temperature on the frequency of random drift of f0 (like jitter, but slower): the higher, the faster f0 "wiggles" at a given temperature 
randomWalk_trendStrength 
try 0 to 1  the higher, the more likely rw is to get high in the middle and low at the beginning and end (i.e. max effect amplitude in the middle of a sound) 
shortestEpoch 
minimum duration of each epoch with unchanging subharmonics regime, in ms 
subFreq 
target frequency of subharmonics, Hz (lower than f0, adjusted dynamically so f0 is always a multiple of subFreq) (anchor format) 
subDep 
the width of subharmonic band, Hz. Regulates how quickly the strength of subharmonics fades as they move away from harmonics in f0 stack (anchor format) 
amplAnchors 
amplitude envelope (dB, 0 = max amplitude) (anchor format) 
interpol 
the method of smoothing envelopes based on provided anchors: 'approx' = linear interpolation, 'spline' = cubic spline, 'loess' (default) = polynomial local smoothing function. NB: this does not affect contours for "noise", "glottal", and the smoothing of formants 
overlap 
FFT window overlap, %. For allowed values, see

samplingRate 
sampling frequency, Hz 
pitchFloor 
lower & upper bounds of f0 
pitchCeiling 
lower & upper bounds of f0 
pitchSamplingRate 
sampling frequency of the pitch contour only, Hz.
Low values reduce processing time. Set to 
dynamicRange 
dynamic range, dB. Harmonics and noise more than dynamicRange under maximum amplitude are discarded to save computational resources 
Returns one continuous, unfiltered, voiced syllable consisting of several sine waves.
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