![]() Since previous studies on voice parameters of middle-aged Korean females using Praat have not been conducted yet, providing normative data has its own significance by itself. In other words, females with higher F 0 values are more likely to have lower values in jitter, shimmer, and NHR however, females with higher jitter values are more likely to have higher values in shimmer and NHR. Further correlation analyses indicated that F 0 is negatively correlated with jitter, shimmer, and NHR, while jitter, shimmer, and NHR are positively correlated with one another. Although aging effect was found only for F 0, intraspeaker variability becomes larger in older females than younger females for all acoustic measures. 006) but not for jitter, shimmer, or NHR. A significant correlation with the age factor was found only for F 0 (r =-0.21, p =. The results showed that the average values of F 0, jitter, shimmer, and NHR were 218Hz, 0.275%, 3.37%, and 0.012, respectively. A total of 238 voices from 250 participants with no apparent voice disorders were acoustically analyzed by Praat. Four acoustic measures-fundamental frequency(F 0), jitter, shimmer, and noise-to-harmonics ratio(NHR) were obtained from a sustained vowel /a/. The purpose of the present study is to provide normative data for acoustic measures of normal voices in Korean women aged between 20 and 59 years, exploring relations among voice parameters and examining changes in voice qualities with aging. Conclusions: Our study suggests that measurement of spectral range profile may be helpful for quantitative assessment of voice quality in adults, and could be recommended for phoniatricians and speech-language pathologists in their clinical practice. The limiting score of the coefficient of sound of ≥ 84.5 % distinguishing singers and non-singers according to ROC curve, has the sensitivity of 100% and specificity of 90.9%. ![]() The logistic regression analysis revealed that coefficient of sound for adults and pitch range for children were selected as the key predictors of well-equipped voice. Results: When compared with non-singers, both genders of adult singers demonstrated a significantly greater average values of coefficient of sound (P<0.05), while no statistically significant differences were found for this parameter in the children groups. Spectral voice quality parameter - coefficient of sound was calculated as the percent ratio of the sound pressure level (SPL) in the singer’s formant frequency region between 2.6 and 3.7 kHz and the SPL of fundamental frequency for fortissimo singing. Methods: SRP in combination with voice range profile (VRP) using standard singing voice protocols were derived from 57 vocally healthy adults (13 trained choir singers, 44 non-singers) and from 23 vocally healthy prepubescent children (12 choir singers, 11 non-singers). Objectives: This study aims to assess the usefulness of spectral range profile (SRP) for quantitative assessment of voice quality in vocally healthy singers and non-singers groups differentiated by age and gender.
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