The characteristic noisy sound of the mongolian word used by hearing field / Монголын Анагаах Ухаан

ABSTRACT

Introduction:According to studies range by the World Health Organization in 2010, 278 million people are deaf or hearing impairment, out of which 24% use an hearing aid and one out of every 10 people has been treated with surgical method and 9 people’s hearing loss has been restored using acoustic treatment method.Purpose:Our purpose is to define noisy vowels of Mongolian word, which will be used for configuration of hearing aid, thereby improve hearing ability.The objectives1. Analyze spectrogram for noisy sound of Mongolian word and define frequency and level of noisy words.2. Define average difference of listening level of the noisy sounds of Mongolian language using “Listening field of Mongolian word”Materials and method:We did the spectrogram for noisy sounds of the Mongolian word using voices of 62 people including male and female children as well as adults. Also, we analyzed frequency energy of all vowels noted in the 60-65 dB computer, via the “PRAAT” software, which defines analysis of speech in phonetics and studied listening level of the strong vowels using listening sphere of word.Result:During our studies, we selected the vowels [a], [e], [u], [o] [a], [ʊ], [ɔ], [i] and defined spectrogram and energy concentration (formant) of each vowel to define the vowels with the highest energy, and further found out that distance difference of the spectrogram of each vowel and frequency between vowels as 300-780 Hz. On the other hand, difference between spectrogram of each strong sound such as [sh], [s], [v], [z], [dj], [kh] has been defines as 340-2800 dB.When we observed the words with strong sound in the listening field of Mongolian words, which were 3- 5 dB lower than the clearer words.Conclusion:1. According to spectrogram, noisy sound [sh], [s], [z], [dj] has frequency of 3300Hz-3500Hz, which is noisier and resulted in poor acoustic listening ability. Further, we found out that Distant difference of vowels of Mongolian language [a], [e], [o] and consonants [m], [n] is far, accordingly, acoustic listening ability has been good, on the other hand, distant difference of vowels of Mongolian word [ʊ], [ɔ], [u] is near or close, accordingly, acoustic listening ability has been not well.2. Level of distinquishment of the noisy sounds of Mongolian word has been lower by 3.6+ 0.8Db to 5.2+1.2Db at levels of clear sound to feedback.