Pronunciation assessment based upon the compatibility between a learner’s pronunciation structure and the target language’s lexical structure

Native-sounding vs. intelligible. This has been a controver-sial issue for a long time in language learning and many teach-ers claim that the intelligible pronunciation should be the goal. What is the physical definition of the intelligibility? The cur-rent work shows a very good candidate answer to this ques-tion. The author proposed a new paradigm of observing speech acoustics based upon structural phonology, where all the kinds of speech events are viewed as an entire structure and this struc-ture was shown to be mathematically invariant with any static non-linguistic features such as age, gender, size, shape, micro-phone, room, line, and so on. This acoustic structure is purely linguistic and the phoneme-level structure is regarded as the pronunciation structure of individual students. This structure is matched with another linguistic structure, the lexical structure of the target language, and degree of compatibility between the two different levels of structures is calculated, which is defined as the intelligibility in this work. To increase the intelligibility, different instructions should be prepared for different students because no two students are the same. The proposed method can show the order of phonemes to learn, which is appropriate to a student and different from that of the others. 1