An Acoustic Analysis of Glottal Stop And the study of the possibility of Existing Two Adjacent Vowel in Successive Syllables in Rapid Speech in Persian

Many of the linguists, have defined the syllable structure of Persian as consisting an obligatory consonant in onset, a vowel in the head position and one or two optional consonants in coda. In this respect, there isn’t the possibility of existing two adjacent vowels in two successive syllables in Persian. It’s believed by many that Persian has some ways, specially adding a consonant, for preventing the adjacency of vowels.In this article, by an empirical study on the basis of data from 50 male and female Persian native speakers (18-25), the properties of Glottal stop and the way of its appearance between two vowels are studied both in slow and continuous speech and their results are compared together.It seems that, at least in rapid and continuous speech, there is a possibility of omitting glottal stop and letting two vowels in successive syllables be adjacent. Regarding this phenomenon, the sound system of Persian and its syllable structure in continuous speech is different.