Devoicing and Deletion and Their Rule Conversion in Iranian Languages

The purpose of this work is the survey of the processes that are related to phonological rules and conversion of each of them in varieties of Iranian languages on the basis framework of generative phonology. For this purpose 39 varieties of Iranian languages have been selected purposefully then the historical form of data have been extracted by the using of the historical resources and finally for discovering the natural rule we will analyze these rules according to criteria that Jensen (2004: 117) has proposed in phonological analysis of rules. The “rule conversion” was introduced by Theo Vennemann (1972: 211) in the article as rule inversion for the first time. In present survey the authors will analyze devoicing and deletion and their conversion in varieties of Iranian languages.