generateGC  R Documentation 
Internal soundgen function. Takes descriptives of a number of glottal cycles (f0, closed phase, rolloff  note that all three should be vectors of the same length, namely nGC) and creates a waveform consisting of a string of these glottal cycles separated by pauses (if there is a closed phase). The principle is to work with one glottal cycle at a time and create a sine wave for each harmonic, with amplitudes adjusted by rolloff.
generateGC( pitch_per_gc, glottisClosed_per_gc, rolloff_per_gc, samplingRate, wn = "none", interpol = "approx" )
pitch_per_gc 
pitch per glottal cycle, Hz 
glottisClosed_per_gc 
proportion of closed phase per glottal cycle, % 
rolloff_per_gc 
a list of onecolumn matrices, one for each glottal cycle, specifying rolloff per harmonic (linear multiplier, ie NOT in dB) Each matrix has as many rows as there are harmonics, and rownames specify the ratio to F0 (eg 1.5 means it's a subharmonic added between f0 and its first harmonic) 
samplingRate 
the sampling rate of generated sound, Hz 
wn 
windowing function applied to each glottal cycle (see

interpol 
method used to adjust the number of gc to target duration 
Returns a waveform as a nonnormalized numeric vector centered at zero.
pitch_per_gc = seq(100, 150, length.out = 25) glottisClosed_per_gc = seq(0, 300, length.out = 25) m = matrix(10 ^ (6 * log2(1:200) / 20)) rownames(m) = 1:nrow(m) rolloff_per_gc = rep(list(m), 25) s = soundgen:::generateGC(pitch_per_gc, glottisClosed_per_gc, rolloff_per_gc, samplingRate = 16000) # plot(s, type = 'l') # playme(s)
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