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마비성조음장애,편도대비,비폐쇄 및 구개열 환자의 실험임상 음성학적 연구
김현기,고도홍,신효근,홍기환,서정환 한국음성과학회 1997 음성과학 Vol.2 No.-
The aim of this study is to develop an assessment program of speech rehabilitation for children having some language and speech disorders. Patients of dysarthria, tonsillectomy, tonsilhypertrophy, and nasal obstruction were selected for this experimental clinical phonetic study. Formant variations (F_1 & F_2) show pre- and post-operation differences in tonsillectomy and cleft palate patients. Nasal formants (NF_1 & NF_2) show pre- and post-operation differences in nasal obstruction. The articulation reaction tiem (ART) as a parameter was used to assess Voice Onset Time(VOT). It was shown longer duration for hypokinetic dysarthria and shorter for atoxic dysarthria. The diadochokinetic rate was measured by Visi-pitch. Lower diadochokinetic rate appeared to spastic and dysarthria in comparison with the control group. It was shown that the nasalance of tonsilhypertrophy, nasal obstruction, and cleft palate patients only by simple vowels such as /a/ and /i/. Keywords: speech disorders, dysarthria, tonsilhypertrophy, cleft palate
김현기,김완호,서정환,홍기환,신효근,고도홍 한국음성과학회 1998 음성과학 Vol.3 No.-
Dysarthrias are a sort of neuromotor disorders because of the weakness of neuromotor controls. They are classified in six types on the basis of Mayo clinic research: flaccid, spastic, ataxic, hypokinetic, hypekinetic and mixed types. Five dysarthria types are investigated in this study. MRI, EMG, neuropathological tests are essential diagnostic processing. Visi-Pitch and Spectrgraphy, CSL are used for assessing dysarthria speech. Maximum phonation time, diadochokinetic rate, Voice Onset Time and substitution rate are the speech evaluation parameters. Maximum phonation time and diadochokinetic rates are the lowest in case of spastic and ataxic dysarthria. Spastic dysarthria shows the substituted glottalized consonants. However, flaccid, ataxic and hypokinetic dysarthrias show the substituted aspirated consonants. VOT is the longest for hypokinetic dysarthria and the shortest for ataxic dysarthria. Jitter shows higher percentage in comparison with control group. Speech evaluation using experimental phonetic instruments help create on international standardization of speech evaluation for speech disorders. Keywords: dysarthria, neuromotor, diadochokinetic rate, jitter, shimmer, VOT, formant
고승오,신효근,김현기,홍기환,서정환,고도홍 한국음성과학회 1998 음성과학 Vol.3 No.-
Velopharyngeal function refers to the combined activity of the soft palate and pharynx in closing and opening the velopharyngeal port to the required degree. In normal speech, during the production of oral consonant sounds elevation of the soft palate, along with the superior constrictor muscle, occludes the oropharynx from the nasopharynx. Inadequate velopharyngeal function caused by congenital or acquired insufficiency or incompetency may result in abnormal speech characterized by hypernasality, nasal emission and decreased intelligibility of speech due to weak consonant production. The speech aid is often helpful in improving the speech of individuals with velopharyngeal incompetency. In this article, the pathogenesis and treatment of velopharyngeal incompetence are discussed and a speech aid appliance that was constructed for the patient is described. Keywards : velopharyngeal, hypernasality, speech aid, pathogenesis
전문 성악인 교육 평가 방법 연구 : 음향분석 컴퓨터 시스템 및 후두 회신경을 사용하여
김선숙,김현기,홍기환 한국음성과학회 1998 음성과학 Vol.4 No.2
The aim of this study is to develop an the assessment program for the singing voice which is based on the physiological and acoustic methods. 22 sopranos, 6 mezzo sopranos, 4 tenors and 4 baritones participated to these experiments. The results measured by Visi-Pitch, spectrograph, and strobo-scope can be summarized as follows : (1) The maximum phonation time of singers must over 14 second higher with one deep inspiration (2) The parts classified by vocal range using Visi-Pitch: soprano between 167 Hz~1,190 Hz, mezzo soprano between 146 Hz~956 Hz, tenor between 75 Hz~503 Hz and baritone between 73 Hz and 385 Hz. (3) Longitudinal glottal size of singers decreases depending on the high-low pitch variation while lattitudinal glottal size increases depending on high-low pitch variation. (4) Well-trained singers show over 5 times the vibrato rate of untrained singers and regular pitch variation during measured periods. Vibrato's intensity do not over 3dB. (5) Singer's formant indicates professional voice depending on the each parts: 3,207 Hz for soprano, 3,057 Hz for mezzo soprano, 2,754 Hz for tenor and 2,560 Hz for baritone. (6) F_1 of singing voice is higher than that of speech while F_2 and F_3 of singing voice are lower than those of speech.
Electroglottography를 사용한 한국어 폐쇄자음의 특성 및 임상적 적용
채윤정,김현기,홍기환 한국음성과학회 1998 음성과학 Vol.4 No.2
An electroglottography (EGG) was used to investigate the function of the vacal folds during their vibration. In this study, four Korean native speakers and 10 vocal polyp patients were selected. To investigate the dynamic change of EGG waveforms for the three-way distinction of Korean stops, a DSP-Sona graph model 5500, a Rino-Laryngeal stroboscope, 3 CSL model 4300B and a Laryngograph were used. An EGG Model 4338 was used to exam the vocal polyp of patients' voices during high, low, comfortable pitch production. The purpose of this study is to investigate the characteristics of Korean stop consonants in relation to pitch and to observe laryngeal movement during vocal fold vibration and speech production. The basic data accumulated during this research can be applied in clinical treatment. The results are as follow: on the Korean stop consonants, the aspirated stop is the highest in the GOT and PC1. On the angle of vowel contour, the angle of lenis is smaller than the angle of heavily aspirated and glottalized stops. The fundamental frequency is lowest at the jenis stop. In vocal polyp patients', the low pitch range is smaller than in normal speakers'. The pitch break and the vocal fry were observed. The jitter and OQ value are higher in vocal polyp patients than in those of normal speakers'. Keywords: electroglottography, stop consonants, vocal polyp