• 음성과학
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• 제13권3호
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• pp.49-65
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• 2006

Recently, several theories on the digital speech signal processing expanded the communication boundary between human beings and machines drastically. The aim of this study is to collect dialectal speech in Korea on a large scale and to establish a digital speech data base in order to provide the data base for further research on the Korean dialectal and the creation of value-added network. 528 informants across the country participated in this study. Acoustic characteristics of vowels and consonants are analyzed by Power spectrum and Spectrogram of CSL. Test words were made on the picture cards and letter cards which contained each vowel and each consonant in the initial position of words. Plot formants were depicted on a vowel chart and transitions of diphthongs were compared according to dialectal speech. Spectral times, VOT, VD, and TD were measured on a Spectrogram for stop consonants, and fricative frequency, intensity, and lateral formants (LF1, LF2, LF3) for fricative consonants. Nasal formants (NF1, NF2, NF3) were analyzed for different nasalities of nasal consonants. The acoustic characteristics of dialectal speech showed that young generation speakers did not show distinction between close-mid /e/ and open-mid$/\epsilon/$. The diphthongs /we/ and /wj/ showed simple vowels or diphthongs depending to dialect speech. The sibilant sound /s/ showed the aspiration preceded to fricative noise. Lateral /l/ realized variant /r/ in Kyungsang dialectal speech. The duration of nasal consonants in Chungchong dialectal speech were the longest among the dialects.

• 말소리와 음성과학
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• 제2권2호
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• pp.43-50
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• 2010

English vowels can be divided into monophthongs and diphthongs depending on the number of vocal tract shapes. Diphthongs are usually produced with more than one shape. This study attempts to collect acoustical data of English diphthongs published by Hillenbrand et al.(1995) online and to examine acoustic features of the diphthongs for phoneticians and English teachers. Sixty three American males and females were chosen after excluding those subjects with different target vowels or ambiguous formant tracks. The author used Praat to obtain the acoustical data systematically at eleven equidistant timepoints over the diphthongal segment. Obvious errors were corrected based on the spectrographic display of each diphthong. Results show that the formant trajectories of the diphthongs produced by the American males and females appeared quite similar. When the female formant values were uniformly normalized to those of the males, almost a perfect collapse occurred. Secondly, the diphthongal movements on the vowel space appeared not linear due to the coarticulatory gesture for the following consonant. Thirdly, the average duration of the diphthongs produced by the females was 1.156 times longer than that of the males while the pitch ratio between the two groups turned out to be 1.746 with a similar contour over measurement points. The author concludes that English diphthongs produced by various groups can be compared systematically when the acoustical values are obtained at proportional timepoints. Further studies will be desirable on the comparison of English diphthongs produced by native and nonnative speakers.

• 말소리와 음성과학
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• 제4권3호
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• pp.85-92
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• 2012

It is a well-known phenomenon that vowel duration in English is generally longer before a voiced stop than a voiceless one. Past research has postulated that the closure duration of the voiceless stop is generally longer than that of the voiced stop and that the duration of a preceding vowel is determined complementarily by the closure duration of the stop. To shed further light on the phenomenon, this study examined fourteen native speakers of American English who read the monosyllabic words [bVC] (V = [i, ɪ, eɪ, ɛ, æ, ʌ, ɑ], C = [t, d]). First, we found that mean vowel duration was 38 ms longer before the voiced stop than the voiceless (mean duration ratio = 1.24). Second, mean closure duration of the voiced stop was only shorter by 5 ms compared to the voiceless stop (mean duration ratio = 0.97). Therefore, for our subjects, vowel duration was not determined complementarily by the closure duration of the following stop. Third, vowels with longer inherent durations (viz., tense, diphthong, and low vowels) tended to show larger duration ratios in the voiced and voiceless contexts than the vowels with shorter durations (viz., lax vowels). This indicates that the lengthening of inherently shorter vowels before a voiced stop is limited in order to avoid overlapping with longer vowels in the duration range. Fourth, there was no significant gender difference in vowel duration ratios in the contexts of voiced and voiceless stops. Finally, considerable individual differences were found in the vowel and consonant duration ratios.

• 융합정보논문지
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• 제8권1호
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• pp.37-42
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• 2018

본 연구는 다섯 개의 문장을 선정하여 그 안에 들어있는 다섯 개의 단어와 그 단어 내에 들어있는 모음들을 대상으로 하여 한국인들의 모음발음 길이를 Praat 프로그램을 이용하여 측정한 후에 원어민의 실험결과와 비교분석한 연구이다. 20명의 한국인 피 실험자들이 실험을 위해 실험문장을 읽고 녹음하였으며, 음향적 특질들은 스펙트로그램 등을 활용한 Praat Software 프로그램을 이용하여 측정하여 그 결과를 얻었다. 이러한 과정을 통해 얻어진 결과들은 통계분석 하였다. 분석결과, 단어단위에서는 3개의 단어에서 두 집단 간 차이가 있었으며, 5개의 모음들은 모두 그 차이가 유의미하였다. 또한 두 실험집단 간 단어와 모음발음크기 비율에 관한 비교에서는 모든 단어와 모음들의 발음크기 비율이 두 집단 간 유의미한 차이를 보여주었다. 이러한 실험결과를 통해 영어전설저모음인 /${\ae}$/와 영어이중모음/ai/, 그리고 첫 번째 음절에 영어강세모음이 오는 경우에 그 발음 길이크기를 분석해보면 한국인 피 실험자집단에서는 외국인어투가 존재함을 다시 확인할 수 있었다.

• 디지털콘텐츠학회 논문지
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• 제13권3호
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• pp.279-290
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• 2012

본 연구는 Praat 소프트웨어 프로그램을 이용하여 영어이중모음 /eɪ/ 와 /aɪ/, 그리고 영어전설저모음 /æ/의 발음 길이에 관해 한국인 피 실험자와 원어민 피 실험자를 대상으로 그 차이를 비교분석해보고자 한 연구이다. 이 연구를 위해서 영어문장이 발화되고 녹음되었으며, 피 실험자는 한국인과 원어민 각각 6명씩 참가하였으며, 모두 여성이었고 나이는 23세에서 35세에 위치하고 있다. 음향특질중 하나인 길이측정을 위해서 Praat소프트웨어 프로그램을 활용하였으며, 그 결과를 통계 처리하였다. 실험결과 /eɪ/ 와 /aɪ/에서는 한국인들이 더 길게 발음하였지만 그 차이가 통계상 유의미한 수준은 아니었다. 그러나 /æ/의 발음에서는 한국인들의 발음 길이가 원어민에 비해 훨씬 짧았으며, 그 차이도 통계상 유의미한 수준으로 나타났다.