원어민과 비원어민의 음성인식 음소 사후확률 비교 연구A Comparison of L1 and L2 Speech Phonetic Posteriorgrams for Applications in Pronunciation Training
- Other Titles
- A Comparison of L1 and L2 Speech Phonetic Posteriorgrams for Applications in Pronunciation Training
- Authors
- 조영선; 남호성
- Issue Date
- 2021
- Publisher
- 한국외국어대학교 외국어교육연구소
- Keywords
- Accent Conversion; Computer-Assisted Pronunciation Training; Phonetic Posteriorgram; 억양 변환; 음성 변환; 음소사후확률; 컴퓨터 보조 발음 교육
- Citation
- 외국어교육연구, v.35, no.1, pp.293 - 304
- Indexed
- KCI
- Journal Title
- 외국어교육연구
- Volume
- 35
- Number
- 1
- Start Page
- 293
- End Page
- 304
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/137948
- DOI
- 10.16933/sfle.2021.35.1.293
- ISSN
- 1225-4975
- Abstract
- This study investigated the pronunciation differences in L1 and L2 English speech via the phonetic posteriorgram (PPG) vectors obtained from acoustic model trained for automatic speech recognition (ASR). PPG is the frame-wise phone-classification result in conventional ASR systems, which has been widely applied to Computer-Assisted Pronunciation Training (CAPT). More recently, PPG has been applied to foreign accent conversion, a field of voice conversion research that can be applied to user-adaptable pronunciation training. This study was aimed at investigating the L1-L2 PPG pattern differences between the speech data previously used for these research endeavors. PPG vectors of the 18 native and 24 non-native English speakers were extracted using a deep neural network (DNN) based ASR system. When analyzed in phone-level, results showed that L1 PPGs were more concentrated on correct phone dimension than L2 PPG, which appeared more dispersed across dimensions. The result is in line with the previous PPG-based CAPT research that identified distinct L2 patterns in English speech. The findings are further discussed in the context application to pronunciation training.
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Collections - College of Liberal Arts > Department of English Language and Literature > 1. Journal Articles
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