• 음성과학
• /
• 제12권2호
• /
• pp.139-149
• /
• 2005

The purpose of this study was to propose a preliminary norm for 'Korean-Test of Articulation for Children(K-TAC)'. The K-TAC was designed to test 19 Korean consonants in various phonetic contexts through 37 words. We collected the data of 220 normally developing children aged 2;6(years;months) to 6;5. We analyzed the mean percentage of consonants correct and the age of acquisition for K-TAC. The results were as follows: first, The mean percentage was over 60% at late 2 years of age, over 80% at th age of 3, and over 90% after the age of 4. There were significant differences among age groups. Second, based on the criterion of correct production by 75% of children, Korean children acquired stops and nasals except for SF velars, glottal fricative, SF liquid and affricates by late 2 or 3 years of age. After that they acquired SF velars at the age of 4 and SI liquid at the age of 5. However, they could not acquire alveolar fricatives by the age of late 6. Third, if the distorted sounds were scored as correct, they acquired SI liquid at 4 years of age and alveolar fricatives at 5 years of age.

• 음성과학
• /
• 제10권2호
• /
• pp.85-95
• /
• 2003

In speech signal processing, it is very important to detect the pitch exactly in speech recognition, synthesis and analysis. If we exactly pitch detect in speech signal, in the analysis, we can use the pitch to obtain properly the vocal tract parameter. It can be used to easily change or to maintain the naturalness and intelligibility of quality in speech synthesis and to eliminate the personality for speaker-independence in speech recognition. In this paper, we proposed a new pitch detection algorithm. First, positive center clipping is process by using the incline of speech in order to emphasize pitch period with a glottal component of removed vocal tract characteristic in time domain. And rough formant envelope is computed through peak-fitting spectrum of original speech signal infrequence domain. Using the roughed formant envelope, obtain the smoothed formant envelope through calculate the linear interpolation. As well get the flattened harmonics waveform with the algebra difference between spectrum of original speech signal and smoothed formant envelope. Inverse fast fourier transform (IFFT) compute this flattened harmonics. After all, we obtain Residual signal which is removed vocal tract element. The performance was compared with LPC and Cepstrum, ACF. Owing to this algorithm, we have obtained the pitch information improved the accuracy of pitch detection and gross error rate is reduced in voice speech region and in transition region of changing the phoneme.

• 말소리와 음성과학
• /
• 제7권1호
• /
• pp.39-45
• /
• 2015

Changes in speech production in normal elderly might be subtle and gradual. Therefore, an acoustic analysis is appropriate to identify the effect of aging on speech. For this purpose, this study examined four speech parameters; voice onset time (VOT), VOT range, $f_0$ of following vowel($f_0FV$), and $f_0FV$ difference in two age groups, old (mean age 74.57 yrs.) and young (m: 27.43 yrs.). The results show that compared to the older group the younger demonstrated significantly shorter VOTs in lenis and longer in aspirated stop. VOT ranges were relatively broad and consequently overlapped between the phonation types (e.g., lenis, fortis, aspirated). The $f_0FV$ values in the older group which are an integral parameter with VOT were lower compared with the young group. The $f_0FV$ differences in the old female group were significantly narrower than the young female group, therefore, clear distinction became difficult. In conclusion, contrast in temporal information was obscured, and the domain of glottal information was diminished on stop consonants in Korean elderly. The findings suggest that central/peripheral changes by aging could lead to a deficit in coordination between phonation and articulation.

• 대한후두음성언어의학회지
• /
• 제11권1호
• /
• pp.104-112
• /
• 2000

An evaluation of voice disorder has two methods. One is a perceptual analysis and the other is an acoustic analysis. All of these methods are just focused on sustained vowel. The analysis of conversational speech levels in voice disorder has not been achieved enough. The purpose of the present study is to compare two syllable words and sustained vowel in the vocal polyp patients and normal male speakers and to be applied on the vocal assessment and the voice therapy as a basic data. fifteen male patients with vocal polyp were the subject group. Fifteen healthy male were the control group for this study. The voices of the subject and control group, saved in MDVP of CSL were analyzed by its own analysis program. As a results, in subject group, the voice qualities between the vowel following lenis stop and the sustained vowel had no differences, and the voice qualities were different significantly between the vowel following heavily aspirated stop and the sustained vowel. In the control group the vowel fllowing stops and sustained vowel had also many differences in their voice quality, especially significant between the vowel following glottal stop and e sustained vowel.

• 대한후두음성언어의학회지
• /
• 제16권1호
• /
• pp.49-52
• /
• 2005

Background and Objectives : Children with cleft palate children may be imparied in articulation and resonance. This study examined the phonological process usage of 3-, 4- and 5- year old children with cleft palate. Materials and Method : Twenty seven children with cleft palat participated 3-, 4- and 5-year old children with cleft palate. The authors performed speech evaluation using picture consonants test for children with cleft palate. Percentage of consonants correct(PCC), mean value of each phoneme depends on articulation site and manner were evaluated. Results : In place of articulation, ommission of velar consonants were the most frequent. In manner of articulation, ommission of nasal consonants were the most frequent. Backing, glottal stop, was the most prominent phonological process children with cleft palate. Conclusion : These results may indicate that articulation disorder with cleft palate. and other articulation disorders differences should be considered in the interpretation of speech evaluations.

• 대한음성학회:학술대회논문집
• /
• 대한음성학회 1996년도 10월 학술대회지
• /
• pp.343-348
• /
• 1996

This paper examines the contribution of vocalic information (after the onset of voicing) to the perception of Korean alveolar stops: the aspirated /$t^{h}$/, the lenis /t/, and the fortis /$t^{*}$/. These stops have been analyzed as differing in VOT (Abramson & Lisker, 1964), the glottal width or aspiration (Kim, 1970), and F0 and intensity build-up (Han & Weitzman, 1970). These studies focused on the articulatory and acoustic qualities of the consonants and often assumed that the consonantal portion before the onset of voicing plays the main role in maintaining the three-way distinction. In contrast, the role of the following vowels was given less attention. In order to investigate the contribution of the following vowels, a perceptual study was conducted using stimuli cross-spliced from three naturally produced syllables [$t^{h}al$] 'mask', [tal] 'moon', and [$t^{*}al$]) 'daughter'. Stimuli were presented to 12 Korean listeners for identification. Each subject responded to a total of 486 tokens. The results show that vowels play the primary role when the cut occurs at the star of voicing. Even with cuts at 10 ms and 40 ms into voicing, the following vowel still plays a clear role. This suggests that vowels carry the important information for distinguishing the three stops.

• 말소리와 음성과학
• /
• 제9권4호
• /
• pp.99-106
• /
• 2017

Clinical data about vocal nodules have seldom been reported, even though vocal nodules are commonly diagnosed in outpatient speech and voice clinic. This study aims to investigate clinical characteristics of the patients who are diagnosed with vocal nodules. This study analyzed the data for 10 years from the 319 patients diagnosed with vocal nodules (45 males and 274 females with the mean age of 39.4 ranging from 2 to 83) in terms of gender, age, occupation, voice change initiation pattern, change with time, throat clearing, smoking history, type of voice abuse, acoustic analysis, maximum phonation time, GRBAS, and VHI. Thirteen patients (4.08%) had unilateral vocal nodule and 306 patients (95.9%) had bilateral vocal nodule, the majority of which had a pattern of asymmetry (73.9%). The glottal closure pattern was hourglass in 72.1% of patients, posterior chink in 17.9% of patients, and irregular in 7.9% of patients. The most common occupational category was professional voice users (43.4%). The voice abuse pattern included excessive talking in 96 patients (76.8%), loud voice in 78 (62.4%) patients, and excessive singing in 17 patients (21.6%). The patients showed worse scores in G, B, and S than in R and A for the GRBAS evaluation. The most recommended treatment for vocal nodules was voice therapy. The current clinical data will be helpful for treatment planning for the patients of vocal nodule.

• 대한후두음성언어의학회지
• /
• 제9권1호
• /
• pp.86-90
• /
• 1998

Verrucous carcinoma is a variant of highly differentiated squamous cell carcinoma and has a predilection for the oral cavity and larynx. It is known to be of good prognosis due to its low regional and distant metastatic potential. Peak incidence is at ages 40-69 while predominantly occuring in males and its association with tobacco smoking has been implicated. The verrucous carcinoma have accordingly been treated by radiotherapy or surgical procedures but there has been considerable controversy regarding the effect of radiotherapy due to the possibility of anaplastic transformation Laser surgery and partial resection are among the commonly used surgical procedures but laser surgery has not yet shown results in improving phonetic abilities. Authors experienced two cases of verrucous carcinoma of the larynx treated by partial laryngectomy and false vocal cord advancement flap who showed no recurrence of disease under stroboscopic examination after two year follow up and when compared to preoperative aerodynamic studies, the expiratory air pressure was decreased and mean air flow rate increased which improved glottal efficiency markedly.

• 대한후두음성언어의학회지
• /
• 제22권2호
• /
• pp.106-110
• /
• 2011

Western classical singing voices are different from those of pop song singer's singing voices as well as traditional Korean singing such as Pansori. We anlalysed the singing voices from three different categories with using free application programs available at the usual smart phones : sound level meter and Spectral View Analyzer and fiberoptic rhinolaryngoscopic evaluation. The intensity of voice produced by a classical western singer was 11 dB louder than that produced by a pop song singer. Source sound, glottic sound, as well as harmonic sound and singing resonant sound (Singer's formant) are much more prominent. When evaluated under video-rhinolaryngoscopy during singing, the resonance cavity especially oropharyngeal cavity and hypopharyngeal cavity are widely opened during singing of the western classical singer than those of the traditional Korean singer's singing. Difference of singing methods including producing the glottal sound, respiration and resonance are discussed. Possible explanation of development of 'Singer's Formant' is discussed.

• 대한후두음성언어의학회지
• /
• 제20권1호
• /
• pp.68-70
• /
• 2009

Acromegalic patients can develop mild upper airway obstruction. However, the limitation of both vocal folds mobility developing dyspnea is rare. We report a case with bilateral vocal cord paralysis associated with acromegaly. The patient visited our clinic presenting dyspnea showing bilateral vocal cord hypomobility in laryngoscopy. The patient underwent a tracheostomy and a transsphenoidal resection of the pituitary adenoma. Thereafter, laser cordotomy with medial arytenoidectomy was done for the permanent treatment of glottal obstruction. The tracheotomy canula was successfully removed one month after the surgery.