• The Journal of the Acoustical Society of Korea
• /
• v.17 no.6
• /
• pp.8-13
• /
• 1998

본 논문은 Gesturewndcjq 이론에 근거한 폐쇄음의 조음장소와 폐쇄음의 폐쇄구간 길이와의 상관관계에 대한 가설 즉, 연구개음의 폐쇄구간이 양순음이나 치음의 폐쇄구간에 비해 짧을 것이라는 가설을 실험음성학적으로 검증하였다. 본 연구의 결과는 이 가설을 완 전히 뒷받침해주지는 않는 것으로 나타났다. 폐쇄음의 조음방법에 따라 약간의 차이를 보이 긴 하나 세 조음방법 상에서 적어도 양순음과 연구개음의 폐쇄구간 길이에 있어서는 본 연 구가 예측한대로 양순음의 폐쇄구간 길이가 연구개음의 폐쇄구간 길이보다 긴 것으로 나타 났다. 그러나 치음의 경우는 연구개음의 폐쇄구간과 통계적으로 유의한 차이를 보이지 않았 다. 본 논문은 Gesture 이론이 폐쇄음 조음에 있어 폐쇄음 gesture와 주위 모음의 gesture와 의 중첩정도 외에 여러 다른 음성학적 사실들을 동시에 고려할 필요가 있음을 보여주었다. 즉, 폐쇄음 조음시 폐쇄강의 크기, 조음기관의 움직임 속도, 폐쇄강 내 압력 형성에 걸리는 시간, 그리고 폐쇄음 조음시 턱의 높이 등에 대한 고려의 필요성을 제시하였다.

• Proceedings of the Korean Society for Cognitive Science Conference
• /
• 2005.05a
• /
• pp.154-157
• /
• 2005

본 연구는 한국어를 학습한 경험이 없는 일본인의 한국어 치경폐쇄음 세 음소 범주(/ㄷ/, /ㄸ/, /ㅌ/)에 대한 지각 학습이 양순폐쇄음 세 음소(/ㅂ/. /ㅃ/, /ㅍ/) 지각에 미치는 효과를 검토하였다. 김윤현과 김정오 (2005)는 일본인들이 지각 학습과제에서 한국어 치경폐쇄음 세 범주를 구분할 때 기식성. 긴장성과 같은 변별 자질에 선택주의 하게 됨을 시사하는 결과를 얻었다. 치경음에 대한 지각 학습으로 적절한 단서에 선택주의 하게 되었다면, 같은 지각 차원에 따라 세 범주로 구분되는 양순음의 경우에도 치경폐쇄음 학습 후 음성자극들을 옳게 범주화를 할 것이다. 실험 결과, 치경폐쇄음 자극(/다/, /따/, /타/)만으로 이루어진 동일-상이판단 학습 과제에서 치경폐쇄음 파악의 정확율은 29.1%(표준오차=3.02) 증가하였고, 조음 위치의 변화에 따른 음향적 차이에도 불구하고 양순폐쇄음의 정반응율도 15.8%(표준오차=3.27)의 향상을 보였다. 이 전이효과는 치경음 지각 학습 때문에 일본인들이 폐쇄음의 세 음소 범주를 구분하는 적절한 지각 차원에 선택주의하게 되었음을 시사한다.

• The Journal of the Acoustical Society of Korea
• /
• v.19 no.6
• /
• pp.28-33
• /
• 2000

This paper investigates the durational difference between syllable final segment and syllable initial one within word level. The Korean consonant (m) and (nn) were focused mainly. It could hardly say that there was significant difference between preceding consonant and following one, but it was observed that the preceding consonant tended to be shorter than the following one in the (mm) case. This might be explained by the fact that bilabial sound should appear at the first step of language acquisition. This leads to the conclusion that the articulation of preceding (m) shall be easier than others. In the case of alveolar geminate (nn), there was considerable statistic difference between preceding and following segments. It tends to be that the preceding consonant has longer duration.

• Speech Sciences
• /
• v.6
• /
• pp.45-54
• /
• 1999

The well-known tendency to delete the labiovelar glide /w/ in some special conditions in Korean was based on perceptual judgment. Among the studies which tried to identify this phenomenon, Silva(1991) and Kang(1997) discovered the important factors of /w/-deletion and tried to give phonological explanations in terms of the Obligatory Contour Principle (McCarthy 1986). This study uses acoustic experiments in order to examine the reality of this phenomenon and tries to explain it on the basis of spectrographic analysis. According to the experiment, it is observed that /w/ is neutralized rather than completely deleted. Therefore, this observation suggests that this phenomena be considered as the /w/-neutralization in the view of acoustic study, instead of the /w/-deletion.

• Phonetics and Speech Sciences
• /
• v.4 no.3
• /
• pp.25-30
• /
• 2012

This study investigated whether native Korean listeners could use visual cues for the identification of the English consonants /b/ and /v/. Both auditory and audiovisual tokens of word minimal pairs in which the target phonemes were located in word-initial or word-medial position were used. Participants were instructed to decide which consonant they heard in $2{\times}2$ conditions: cue (audio-only, audiovisual) and location (word-initial, word-medial). Mean identification scores were significantly higher for audiovisual than audio-only condition and for word-initial than word-medial condition. Also, according to signal detection theory, sensitivity, d', and response bias, c were calculated based on both hit rates and false alarm rates. The measures showed that the higher identification rate in the audiovisual condition was related with an increase in sensitivity. There were no significant differences in response bias measures across conditions. This result suggests that native Korean speakers can use visual cues while identifying confusing non-native phonemic contrasts. Visual cues can enhance non-native speech perception.

• The Journal of the Acoustical Society of Korea
• /
• v.35 no.4
• /
• pp.319-329
• /
• 2016

The present study was to test if breathing training in melodic intonation therapy (MIT) ameliorated the articulation intelligibility of Broca's aphasics or not. The experimental group did breathing training (2 stages) that preceded the MIT. In order to evaluate the efficacy of the MIT intervention, the VOT (Voice Onset Time), the TD (Total Delay), the voice sound intensity and the expiratory volume of the subjects, closely associated with articulation intelligibility were measured before and after the intervention. It was shown that, in the experimental group after the MIT intervention, the VOT and TD were increased on bilabial/p/, alveolar consonant /t/, and soft palatal /k/(p < 0.05), but no significant differences were found on affricate /c/ and fricative /s/(p > 0.05). In the control group, no significant increases in the VOT and TD were observed on all articulation points(p > 0.05). The voice sound intensity which influences the verbal articulation increased in the experimental group after the intervention(p < 0.05), whereas no significant changes were observed in the control group. In conclusion, the breathing training in the MIT was found to result in improving the articulation intelligibility of Broca's aphasiacs.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.5 no.2
• /
• pp.200-207
• /
• 2000

Recently, it is increased to apply the inverter system to household electrical appliances, especially in the air c conditioners, refrigerators and washing machines, to reduce the power consumption and the acoustic noise by t the low speed operation, and to make their functions more comfortable for human beings. For the inverter s systems, however, it is highly required to reduce the undesirable electromagnetic noise and psychoacoustic n noise generated by PWM for variable speed operation. In this paper, the electromagnetic noise for the d detenninistic PWM and random PWM for the reciprocating compressors driven by the brusWess dc motor was a analyzed. It was also verified through the experiment that the elt'Ct$\tau$omagnetic noise was reduced and the s sound quality was improved by applying the random PWM.

• Proceedings of the KSLP Conference
• /
• 1993.12a
• /
• pp.11-11
• /
• 1993

현존하는 문헌에 의하면, 입술근육의 수축과 운동시간의 측면에서 영어의 자음을 경음-연음분류를 할 수 있는 음성학적 실증이 없는 것으로 나타나고 있다. 본 연구는 근육운동 측정기를 사용하여 영어와 한국어의 양순 정지음의 발화시 근육(orbicularis oris superior muscle)운동을 측정하였다. 영어의 강세음절에서는 기존의 주장과 같이 /p/와 /b/의 발화시 근육운동에 차이가 없거나 일관성이 없는 것으로 나타났으나, 무강세음절에는 기존 이론과 달리 근육운동수축에 있어서 /p/가 /b/에 비하여 통계학적으로 훨씬 큰 것으로 나타났다.(중략)

• Phonetics and Speech Sciences
• /
• v.1 no.4
• /
• pp.11-15
• /
• 2009

The aim of this study was to identify production difficulties of Korean learners of English in their articulation of English bilabial stops /p, b/ and labiodental fricatives /f, v/. Sixty non-sense syllables and twelve words were produced three times by nine graduate students. Test scores were measured from the score board made by FluSpeak, a speech training software program, which was designed for English pronunciation practice and improvement. Results show that 1) the subjects had lower scores in producing /p, b/ than /f, v/ from all positions, and 2) subjects had lower scores in medial (inter-vocalic) position than in initial (pre-vocalic) position and in final (post-vocalic) position when they produced /p/, /b/, /f/, and /v/. The results suggest that on the whole, Korean learners of English have much difficulty in producing /b/ and that they also have more articulatory problems in intervocalic than in the other positions when they produce these bilabial stops and labiodental fricatives.

• Phonetics and Speech Sciences
• /
• v.16 no.2
• /
• pp.99-109
• /
• 2024

Coarticulation is affected by the continuous movement of the articulator within a limited time and space through the neighboring segments and various overlaps. This study investigated the differences in coarticulation characteristics of children with reading disabilities and nondisabled children in CVC and VCV syllables consisted of stops, affricates, and vowels (a, i, u). The subjects were 13 children with reading disabilities and nondisabled children in the 2nd to 6th grades in elementary school. Two second formants were measured. One was measured at the point where the vowel began, and the other was measured at the mid point of the vowel stable section. Regression analysis was performed with F2 onset and F2 of the following vowel to obtain the locus equation (LE). 3-way ANOVA was conducted to the slope of the LE according to the groups (reading disabilities vs. nondisabled), places of articulation, and phonation types. In CVC syllable, dyslexic children showed a flatter slope than nondisabled children. With respect to the places of articulation, velar or bilabial sounds showed steeper LE slope than alveolar or palatal sounds. There were no main effects regarding group and phonation types variable for VCV syllable, and the significant differences in the places of articulation were also differed from the results for the CVC syllables. This study confirmed that dyslexic children showed a different pattern of coarticulation slope depending on the syllable structure. We also found that the higher pause rate of the dyslexic children had a stronger effect on the coarticulation in VCV structures.