• 말소리와 음성과학
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• 제13권2호
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• pp.9-17
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• 2021

Voice onset time (VOT) is known to be a primary acoustic cue that differentiates voiced from voiceless stops in the world's languages. While much attention has been given to the sound change of Korean stops, little attention has been given to that of English stops. This study examines VOT of stop consonants as produced by English speakers in comparison to Korean speakers to see whether there is any VOT change for English stops and how the effects of stop, place, gender, and individual on VOT differ cross-linguistically. A total of 24 native speakers (11 Americans and 13 Koreans) participated in this experiment. The results showed that, for Korean, the VOT merger of lax and aspirated stops was replicated, and, for English, voiced stops became initially devoiced and voiceless stops became heavily aspirated. English voiceless stops became longer in VOT than Korean counterparts. The results suggest that, similar to Korean stops, English stops may also undergo a sound change. Since it is the first study to be revealed, more convincing evidence is necessary.

• 대한음성학회지:말소리
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• 제46호
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• pp.1-11
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• 2003

This study examines the acoustic characteristics of Korean stops of two dialects, Seoul and Kyungsang, focusing on VOT(Voice Onset Time). 8 speakers of these two dialects were asked to read 590 words which contain the stops of different places of articulation and phonation types. The results showed that overall the VOTs of Kyungsang dialect were shorter than those of Seoul dialect. This was more prominent in lenis stops than in fortis or aspirated stops. It was also shown that there were significant VOT overlapping differences between the two dialects.

• 말소리와 음성과학
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• 제4권2호
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• pp.33-40
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• 2012

The purpose of this paper is to investigate the voice onset time (VOT) of the English voiceless stops [p, t, k] found in the Buckeye Corpus of Conversational Speech [1]. Three young female speakers were chosen for this study and their VOT values were semi-automatically extracted along with other factors. The factors used for the analysis were place of articulation, location in word, syllabic stress, content word or not, word frequency calculated from the corpus, and the speech rate expressed in syllables per second. Results showed that, for the three places of articulation of each speaker, all the factors had a statistically significant effect on the VOT values. This paper has significance in that the materials used for the analysis were from a corpus of spontaneous natural English speech.

• 대한음성학회지:말소리
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• 제15_18호
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• pp.19-34
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• 1989

There is general agreement that voice onset time (VOT) is functionally related with the glottal opening at the moment of the oral release of a stop. However, systematic investigations of tempo 8n4 the place of articulation as affecting the glottal opening and VOT have relatively neglected. Various instrumental techniques were used to verify the claim with BrEng and korean speakers, under controlled experimental conditions, tempo being one of them. It was found that voiceless aspiration (i.e. VOT) is not simply a function of the glottal area at the moment of the oral release of a stop as it is normally defined in the existing literature. Within a given place of articulation and across temper VOT was generally insignificantly related to the glottal area. It is inferred that the glottal adduction onset time for the following vowel is actively control led by the speaker to meet aerodynamic requirements in relation to class (i.e. aspirated and unaspirated) and tempo. Some possible underlying physiological mechanisms for various phonetic aspects of intervocalic stops, associated with the glottal area and VOT, were discussed.

• 말소리와 음성과학
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• 제16권1호
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• pp.25-31
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• 2024

This study examines the perceptual motivation behind dissimilation. Consistent with previous arguments suggesting that dissimilation originates from perception rather than production (Coetzee, 2005; Kiparsky, 2003; Scheer, 2013), we hypothesized that an oral stop with short of voice onset time (VOT) would be recognized as non-aspirated more often when it is followed by an aspirated stop with a long VOT. This hypothesis was tested through a perception experiment in which 32 Korean listeners made judgments on the first consonant of C₁VC₂V words manipulated with C₁ VOT and C₂ types. The results revealed that aspirated-based C₁ was recognized as aspirated or tense depending on the duration of VOT, while lenis-based C₁ was consistently recognized as lenis. The dissimilatory effect of aspirated C₂ was confirmed as anticipated, and furthermore, tense C₂ increased the ratio of tense responses more than aspirated C₂. These results provide evidence of a perceptual bias against recurrent aspirated stops, which may play a role in activating a dissimilatory rule or constraint in a language. The assimilatory effect of tense C₂ is in consistent with findings indicating that word-initial tensification is facilitated by the following tense stop in Korean (Kang & Oh, 2016; H. Kim, 2016).

• 대한후두음성언어의학회지
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• 제8권1호
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• pp.49-53
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• 1997

Aberrations in VOT measures in apraxia of speech are indicative of speech motor programming impairment. In English, overlaps of VOT between voiceless and voiced plosives have been frequently observed in patients with apraxia of speech. Unlike English, Korean plosives constitute trichotomy in terms of manner of production, that is, voiceless aspirated /p', t', k'/ ; voiceless or voiced, weakly aspirated /p-b, t-k, k-g/ ; or voiceless, heavily aspirated /p, t, k/. In this spectrographic study, VOT measures during Korean plosives produced by a patient with apraxia of speech were compared to those by age- and gender- matching normal subjects. The results indicated that there were partial overlaps between VOT of /b, d, g/ and those of /p, t, k/, implying that the errors were phonetic in nature. In addition, larger VOT variabilities in apraxia of speech compared to the normals were noted.

• 말소리와 음성과학
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• 제15권1호
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• pp.35-45
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• 2023

일본어의 전통적인 어두 폐쇄음은 파열 전에 성대 진동을 동반하는 유성음과 파열 후에 약간의 기음을 동반하는 무성음으로 이분된다. 한편 도호쿠지방의 유성음은 어느 세대나 파열 전에 성대 진동을 동반하지 않고 무성화한 유성음으로 실현되어 다른 지역과 대조를 이룬다. 무성화한 유성음은 voice onset time(VOT)이 양값으로 나타나고 그러면 기존의 무성음의 VOT와 충돌하게 되어 카테고리 구별에 영향을 미치게 된다. 이에 대해 도호쿠지방의 화자는 생성 시에 다른 지역과는 달리 폐쇄음 구별에 후속 모음의 fundamental frequency(F0)를 적극적으로 사용하는 것이 여러 연구에 의해 확인되었다. 본 연구는 인지면에서도 F0가 폐쇄음 구별에 중요한 역할을 하고 있는지를 밝히기 위해 VOT와 함께 검토한 것이다. VOT와 F0를 재합성한 자극음을 사용하여 도호쿠지방 청자를 대상으로 조건을 달리한 여러 개의 지각실험을 실시하였다. 결과에서는 무의미어의 경우 지역차(도호쿠 지방 vs.주부 지방)는 유의하지 않았으나 유의미어에서는 어휘에 따라 F0 사용에 유의한 차이가 있었으며 이러한 차이는 F0를 적극적으로 사용하는 몇몇의 청자들에게서 기인하는 것으로 밝혀졌다. 논의에서는 이들이 혁신 청자들로 여겨지며 이들을 중심으로 폐쇄음 지각에 F0 역할이 일반화되고 지각특성으로서 F0가 확립될 가능성에 대해 추론해 보았다.

• 대한후두음성언어의학회지
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• 제17권2호
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• pp.98-102
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• 2006

Background and Objectives : Voice onset time(VOT) is defined as the time interval from oral release of a stop consonant to the onset of glottal pulsing in the following vowel. VOT is a temporal characteristics of stop consonants that reflects the complex timing of glottal articulation relative to supraglottal articulation. Stop consonants are characterized by creation of a pressure difference across a complete occlusion in the vocal tract, followed by a sudden release 'burst' due to opening that occlusion. The objects of this study is to evaluate a usefulness of voice onset time in the assessment of voice disorderd patients. Subjects : Subjects were 20 adults with normal voice and with benign laryngeal disorders. Subjects with voice disorders represented the following vocal pathologies : vocal polyp, vocal nodule, Reinke's edema and unilateral vocal fold paralysis(UVFP). Control subjects were matched for age (21-40 yews old) and sex(male) with the voice disorders subjects and had normal vocal qualities with no history of voice disorders. Methods : Each voice-disordered and matched control subject read the test passages containing three types of Korean bilabial consonants. VOT measures were made for the initial $/p/p^h/\;and\;/p'/$. VOT was measured using acoustic waveform or wide band spectrogram. Results : For each voiceless stop consonants, there was a significant difference in VOT between the voice disordered and normal subjects. The mean VOTs of the lax stops in UVFP was significantly shorter than those of control subjects in the UVFP. The mean VOTs of the aspirated stops in the vocal polyp and nodule were longer than those of control subjects, but not significant. The mean VOTs of the glottalized in voice disordered groups were longer than those of control subjects, and significant statistically in the UVFP. Conclusions : VOT may be a clinically useful acoustic parameter in the assessment of voice disordered patients, especially in the unilateral vocal fold paralysis.

• 음성과학
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• 제3권
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• pp.109-117
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• 1998

This paper tests whether the VOT (Voice Onset Time) contributes to the perception of tense and plain stops in Korean in the initial position. Previous studies have yielded opposite results regarding the role of the VOT in the distinction of these two stop categories. One the one hand, Lisker and Abramson (1964), Kim (1965), and Han and Weitzman (1970) suggest that the Korean plain and tense stops exhibit overlapping values of VOT and thus that, unlike many other languages, the VOT fails to serve as a cue to separate these stop categories. On the other hand, Silva (1991, 1992), and Lee (1991, 1994) use similar methods, but find that the VOT serve as the cue. In this study, the differences in the acoustic measurement with respect to the VOT of Korean plain and tense stops in initial prevocalic position will be tested preceptually, in seeking to determine whether these acoustic differences are used by listeners to distinguish these two stop types.

• 대한후두음성언어의학회지
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• 제7권1호
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• pp.50-55
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• 1996

Acoustic analysis study was performed on 20 normal subjects by speaking nonsense syllables composed of Korean bilabial stops$(/P, P^{\star}, P^{h}/)$ and their preceding and/or following vowel /a/ (that is, $[pa, p^{\star}a, p^{h}a, apa, ap^{\star}a, ap^{h}a]$) with an ultraminiature pressure, sensor. in their mouths. Speech materials were phonated twice, once with a moderate voice, another time with a loud voice. The acoustic signal and intraoral pressure were recorded simultaneously on computer. By these procedures, we were to measure the intraoral pressure, closure duration and VOT of Korean bilabial stops, and to compare the values one another according to the intensity of phonation and the position of the target consonants. Intraoral pressure was measured by the peak intraoral pressure value of Its wave closure duration by the time interval between the onset of intraoral pressure build-up and the burst meaning the release of closure ; Voice onset time(VOT) on by the time interval between the burst and the onset or glottal vibration. Heavily aspirated bilabial stop consonant /$p^h$/ showed the highest intraoral pressure value, unaspirated /$p^{\star}$/, the second, slightly aspirated /P/, the lowest. The syllable initial bilabial stops showed higher intraoral pressure than word initial stops, and the value of loudly phonated consonants were higher than moderate consonants. The longest closure duration period was that of /$p^{\star}$/ and the shortest, /P/, and the duration was longer in word initial position and in the moderate voice. In VOT, the order of the longest to shortest was $/{p^h}/, /p/, /{p^\star}/$, and the value was shorer when the consonant was in intervocalic position and when it was phonated with a loud voice.