getFormantDispersion  R Documentation 
Internal soundgen function.
getFormantDispersion(
formants,
method = c("meanDispersion", "regression")[2],
tube = c("closedopen", "openopen")[1],
interceptZero = TRUE,
speedSound = 35400,
plot = FALSE,
checkFormat = TRUE,
output = c("simple", "detailed")[1]
)
formants 
formant frequencies in any format recognized by

method 
the method of estimating vocal tract length (see details) 
tube 
the vocal tract is assumed to be a cylindrical tube that is either "closedopen" or "openopen" (same as closedclosed) 
interceptZero 
if TRUE, forces the regression curve to pass through the origin. This reduces the influence of highly variable lower formants, but we have to commit to a particular model of the vocal tract: closedopen or openopen/closedclosed (method = "regression" only) 
speedSound 
speed of sound in warm air, by default 35400 cm/s. Stevens (2000) "Acoustic phonetics", p. 138 
plot 
if TRUE, plots the regression line whose slope gives formant dispersion (method = "regression" only). Label sizes show the influence of each formant, and the blue line corresponds to each formant being an integer multiple of F1 (as when harmonics are misidentified as formants); the second plot shows how VTL varies depending on the number of formants used 
checkFormat 
if FALSE, only a list of properly formatted formant frequencies is accepted 
output 
"simple" (default) = just the VTL; "detailed" = a list of additional stats (see Value below) 
Estimates formant dispersion based on one or more formant frequencies.
soundgen:::getFormantDispersion(
list(f1 = c(570, 750), f2 = NA, f3 = c(2400, 2200, NA)))
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