Acoustic study of /i,u/ in the Spanish diphthong. Borzone de Manrique, A. M. Language and Speech, 19(2):121-128.
doi  abstract   bibtex   
The positional variants of /i, u/ in the Spanish diphthong were studied by spectographic techniques. Four male speakers recorded a list of 24 words that contained the dipthongs /ie/, /ei/, /ue/ and the sounds /i/, /u/ in the same consonant environment. The measurement of the central frequency of the first three formants shows that their displacement is different for each positional variant. Furthermore the intensity relation between the positional variants and the vowel-sound /e/ and the rate of change of F2 transition seem to be significant cues for the identification of the three variants observed. These acoustic results suggest some articulatory differences in the way these variants are produced.
@article{Borzone-de-Manrique:1976aa,
	Author = {Borzone de Manrique, Ana María},
	Date = {1976},
	Date-Added = {2016-10-29 11:54:42 +0000},
	Date-Modified = {2017-04-19 08:04:06 +0000},
	Doi = {10.1177/002383097601900203},
	Journal = {Language and Speech},
	Keywords = {Spanish, phonetics, acoustic phonetics, segmental, diphthongs, vowels},
	Number = {2},
	Pages = {121-128},
	Title = {Acoustic study of /i,u/ in the Spanish diphthong},
	Volume = {19},
	Abstract = {The positional variants of /i, u/ in the Spanish diphthong were studied by spectographic techniques. Four male speakers recorded a list of 24 words that contained the dipthongs /ie/, /ei/, /ue/ and the sounds /i/, /u/ in the same consonant environment. The measurement of the central frequency of the first three formants shows that their displacement is different for each positional variant. Furthermore the intensity relation between the positional variants and the vowel-sound /e/ and the rate of change of F2 transition seem to be significant cues for the identification of the three variants observed. These acoustic results suggest some articulatory differences in the way these variants are produced.},
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