Hi,
I would like to calculate formant dispersion, but most phonetic (and non-phonetic) sources assume the reader knows how to do so. I have found one formula (attached), but don't know how to read it.
It's also not entirely clear to me if there are various types of dispersion formulae - so far, this is the impression I'm getting from checking out dispersion for things other than formants.
Many thanks for help!
Míša
I think, you need firstly glance at [43] :)
Secondly, "average distance between adjacent formants" means, in my opinion, that you have a set of records of the same vowel and i is number of a record. Thus, for formant #1 you can calculate dispersion using (1).
I did glance at [43] :o) I'm just very slow on the uptake (thank you for your answer!)
Formant dispersion is just an average distance between formants (Fitch, W. T. (1997). Vocal tract length and formant frequency dispersion correlate with body size in rhesus macaques. Journal of the Acoustical Society of America 102: 1213-1222.). The difference between different versions that you have seen may be due to the number of formants included in the measurements. ProsodyPro (http://www.homepages.ucl.ac.uk/~uclyyix/ProsodyPro/) provides two of those measurements, Formant_dispersion1_3, and Formant_dispersion1_5, both are in Hz scale.
Formula (1), for three formants translates simply as:
((F2-F1) + (F3-F2))/2
and for four formants it would be:
((F2-F1) + (F3-F2) + (F4 - F3))/3
etc.
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