Phonetics and Speech Sciences (말소리와 음성과학)

Korean Society of Speech Sciences (한국음성학회)
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A study on the voiceless plosives from the English and Korean spontaneous speech corpus

영어와 한국어 자연발화 음성 코퍼스에서의 무성 파열음 연구

  • Yoon, Kyuchul (Department of English Language & Literature, Yeungnam University)
  • 윤규철 (영남대학교 영어영문학과)
  • Received : 2019.10.16
  • Accepted : 2019.11.30
  • Published : 2019.12.31
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Abstract

The purpose of this work was to examine the factors affecting the identities of the voiceless plosives, i.e. English [p, t, k] and Korean [ph, th, kh], from the spontaneous speech corpora. The factors were automatically extracted by a Praat script and the percent correctness of the discriminant analyses was incrementally assessed by increasing the number of factors used in predicting the identities of the plosives. The factors included the spectral moments and tilts of the plosive release bursts, the post-burst aspirations and the vowel onsets, the durations such as the closure durations and the voice onset times (VOTs), the locations within words and utterances and the identities of the following vowels. The results showed that as the number of factors increased up to five, so did the percent correctness of the analyses, resulting in 74.6% for English and 66.4% for Korean. However, the optimal number of factors for the maximum percent correctness was four, i.e. the spectral moments and tilts of the release bursts and the following vowels, the closure durations and the VOTs. This suggests that the identities of the voiceless plosives are mostly determined by their internal and vowel onset cues.

본 논문의 목적은 자연발화 음성 코퍼스를 대상으로 영어 무성 파열음 [p, t, k]과 한국어 격음 파열음 [ph, th, kh]의 조음위치 결정에 영향을 미치는 요인들을 살펴보는 것이다. 프랏 스크립트를 이용하여 요인들은 자동 추출하였고, 판별분석을 통해 요인의 수를 점차 증가시켜가면서 무성 파열음의 예측 정확도를 계산하였다. 분석에 사용된 요인들은 개방파열, 파열 후 기식음과 모음 시작 부분의 운동량과 스펙트럼 기울기, 폐쇄구간과 VOT, 단어와 발화 내 위치, 마지막으로 직후 모음의 종류 등이었다. 분석 결과에 따르면, 요인의 수가 다섯 개까지 증가하는 경우 예측정확도가 최대로 증가하여 영어는 74.6%, 한국어는 66.4%를 나타내었다. 그러나 사실상의 최대값에 도달하는 데는 네 개의 요인으로도 충분하였고, 이들은 개방파열과 직후 모음의 운동량과 스펙트럼 기울기, 폐쇄구간과 VOT였다. 이는 무성파열음의 조음위치가 자신의 내부 요인들과 직후 모음의 영향을 동시에 받는다는 것을 의미한다고 볼 수 있다.

Keywords

References

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