Acoustic Distinctions of English /o/ and /ɔ/ Produced by English Speakers and Korean Learners of English
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This paper is an acoustical study of English vowels/o/ and /ɔ/ produced by native English speakers (NESs) and Korean learners of English (KLEs): it examines F1 and F2 values, duration, and formant movements of the two vowels in a CVC syllable. The results showed that /o/ by NESs (and KLEs) shows neither the typical formant transition of diphthongs nor the typical long vowel duration of diphthongs and thus /o/ occurs as a monphthong in the CVC structure; KLEs’ /o/ and /ɔ/ vowels are less distinct than NESs’ /o/ and /ɔ/ in terms of F1 and F2 values; the differences in F1 and F2 values between the two vowels was 196 Hz and 201 Hz in NESs’ speech but only 85 Hz and 107 Hz in KLEs’ speech; the following consonant type affected the formants difference between /o/ and /ɔ/ in the speech of NESs but not in the speech of KELs; lastly, KLEs pronounce a consonant longer and a vowel shorter than NESs do. (Pai Chai University)
Abstract
This paper is an acoustical study of English vowels/o/ and /ɔ/ produced by native English speakers (NESs) and Korean learners of English (KLEs): it examines F1 and F2 values, duration, and formant movements of the two vowels in a CVC syllable. The results showed that /o/ by NESs (and KLEs) shows neither the typical formant transition of diphthongs nor the typical long vowel duration of diphthongs and thus /o/ occurs as a monphthong in the CVC structure; KLEs’ /o/ and /ɔ/ vowels are less distinct than NESs’ /o/ and /ɔ/ in terms of F1 and F2 values; the differences in F1 and F2 values between the two vowels was 196 Hz and 201 Hz in NESs’ speech but only 85 Hz and 107 Hz in KLEs’ speech; the following consonant type affected the formants difference between /o/ and /ɔ/ in the speech of NESs but not in the speech of KELs; lastly, KLEs pronounce a consonant longer and a vowel shorter than NESs do. (Pai Chai University)
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