The Survey of Acoustic Evidences and the Degree of Parsability in Persian Prefix’s Derived Words in Speech Processing

The matters in spoken morphology and speech processing can explain by acoustic evidences. The morphological complexity and diversity in this area can describe by acoustics features. The present study by Persian prefixes derivational words investigate the degree of parsability in process, understand and receive the meaning indicate by the acoustic evidences. For this reason, the derived words of the «nɑ», «ham», «farɑ» prefixes and their bases extracted from the Institute of Humanities and in the Complexity-Based Ordering framework (Hay and Plag 2004) the parsable and non-parsable words of each prefix determined by scatter plot and the trend line. From each prefix two parsable and non-parsable derived words chose and put them in carrier sentences. Then, the acoustic features such as duration, pitch, formants, intensity, duration of maximum intensity and clarity of transition point survey by using 72 sentences and 3 Persian language speakers. The results show that relative duration of parsable words is more than non-parsable words. The degree of co-articulation in pitch frequency, first, second and third formant frequency of non-parsable words in transition points of affix and base and in statical position of affix is more than parsable words because of incorporation and without potential pauses. In non-parsable words the relative maximum duration of intensity is more and the process of it is more smooth. So, the lesser co-articulations in parsable words cause the clarity of formants in transition points is more than non-parsable words in spectrum.