This paper examines how phonetically-motivated units affect the performance of phone recognition systems. Focusing on the realization of /h/, which is one of the most frequently error-making phones in Korean phone recognition, three different phone sets are designed by considering optional phonetic constraints which show complementary distributions. Experimental results show that one of the proposed sets, the h-deletion set improves phone recognition performance compared to the baseline phone recognizer. It is noteworthy that this set needs no additional phonetic unit, which means that no more HMM is necessary to be modeled, accordingly it has the advantage in terms of model size. Besides, it obtains competent performance compared to the baseline system in terms of word recognition as well. Thus, this phonetically-motivated approach dealing with improvement of phone recognition performance is expected to be used in embedded solutions which require fast and light recognition process.
Bibliographic reference. Hong, Hyejin / Chung, Minhwa (2009): "Improving phone recognition performance via phonetically-motivated units", In INTERSPEECH-2009, 1663-1666.