Internal soundgen function.
a vector of formant frequencies, Hz
Calculates formant bandwidth as a function of formant frequencies using a modified version of TMF-63 formula. Namely, above 500 Hz it follows the original formula from Tappert, Martony, and Fant (TMF)-1963, and below 500 Hz it applies a correction to allow for energy losses at low frequencies. See Khodai-Joopari & Clermont (2002), "Comparison of formulae for estimating formant bandwidths". Below 250 Hz the bandwidth is forces to drop again to avoid very large values near zero (just guesswork!)
f = 1:5000 plot(f, soundgen:::getBandwidth(f), type = 'l', xlab = 'Formant frequency, Hz', ylab = 'Estimated bandwidth, Hz')
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