scholarly journals Multidimensional voice assessment: the immediate effects of Lax Vox® in singers with voice complaints

Revista CEFAC ◽  
2021 ◽  
Vol 23 (2) ◽  
Author(s):  
Ruliano Santana da Matta ◽  
Marco Aurélio Rocha Santos ◽  
Elisa Meiti Ribeiro Lin Plec ◽  
Ana Cristina Côrtes Gama
Keyword(s):  
Fundamental Frequency ◽  
High Speed ◽  
Acoustic Analysis ◽  
Statistical Tests ◽  
Voice Analysis ◽  
Mean Values ◽  
Significance Level ◽  
Vocal Technique ◽  
Voice Assessment ◽  
Aerodynamic Parameters

ABSTRACT Purpose: to multidimensionally assess the effect of the Lax Vox® vocal technique on singers with voice complaints. Methods: a comparative intrasubject study that assessed 30 singers - 13 males and 17 females, aged 18 to 55 years - who self-reported voice complaints and had voice problems symptoms. The participants were submitted to voice assessment with perceptive-auditory, acoustic, aerodynamic, and electroglottographic voice analysis, as well as laryngeal assessment with high-speed videolaryngoscopy. The participants were assessed at two moments: 1) at the beginning of the data collection; and 2) five minutes after performing the Lax Vox® vocal technique. The groups were compared with appropriate statistical tests, with a 5% significance level. Results: in the acoustic analysis, there was an increase in the fundamental frequency for males, after using the Lax Vox® vocal technique. In the aerodynamic assessment, there was an increase in the airflow mean values during vocalization, as well as in aerodynamic power after using the Lax Vox® vocal technique in both groups. Conclusion: the Lax Vox® vocal technique, in the studied singers with a complaint of dysphonia, promoted an increase in the fundamental frequency, for males. In the aerodynamic parameters, in both sexes, it promoted an increase in the airflow and aerodynamic power.

scholarly journals Occurrence of vocal changes in preschoolers with no voice complaints: an auditory-perceptual and acoustic analysis

Revista CEFAC ◽  
2021 ◽  
Vol 23 (2) ◽  
Author(s):  
Gabriela Samanttha Cavalcanti do Nascimento ◽  
Giselle Frutuoso do Nascimento ◽  
Juliana Fernanda Dias da Silva ◽  
Sandro Júnior Henrique Lima ◽  
Zulina Souza de Lira ◽  
...  
Keyword(s):  
Fundamental Frequency ◽  
Acoustic Analysis ◽  
Statistical Association ◽  
Acoustic Parameters ◽  
Significance Level ◽  
Perceptual Analysis ◽  
Perceptual Evaluation ◽  
Mild Degree ◽  
Voice Changes ◽  
Perceptual Assessment

ABSTRACT Purpose: to verify, with the auditory-perceptual and acoustic parameters, the occurrence of voice changes in children with no voice complaints, per sex. Methods: the registers of 36 children with no voice complaints, aged 6 to 8 years, of whom 19 were males, were assessed. The databank consisted of the recordings of sustained vowels, sentences, and spontaneous speech. The auditory-perceptual analysis was conducted with the Consensus Auditory-Perceptual Evaluation of Voice, and the acoustic analysis, with VoxMetria. The fundamental frequency, jitter, shimmer, noise, and glottal-to-noise excitation ratio were analyzed. The Mann-Whitney test was applied for numerical variables, and the McNemar test, for the categorical ones, at the p < 0.05 significance level. Results: of the 5 children with mild voice changes, 4 were males. The most frequent resonance deviation was the laryngopharyngeal one. There was no difference between the sexes in the auditory-perceptual findings. The fundamental frequency in the group with changes was lower than that in the group without changes. There was a statistical association between the changes in the auditory-perceptual assessment and the acoustic parameters. Conclusion: voice changes occurred in 13.89% of the studied sample of children with no voice complaints, without differences between the sexes in the auditory-perceptual parameters. Vocal deviations were in a mild degree in all children who had them, the most frequent ones being roughness and breathiness. The fundamental frequency and shimmer were the acoustic parameters whose values most often occurred outside the reference limits, in both genders.

Practical Acoustics in Clinical Voice Assessment: A Praat Primer

2017 ◽  
Vol 2 (3) ◽  
pp. 14-32 ◽  
Author(s):  
Youri Maryn
Keyword(s):  
Fundamental Frequency ◽  
Software Package ◽  
Sound Level ◽  
Voice Analysis ◽  
Acoustic Voice Analysis ◽  
Voice Assessment ◽  
Frequency Sound ◽  
Level Spectrum ◽  
Graphical Information

Praat is a freely available software package for formatting and analyzing sound signals. It carries many features relevant to voice signals and it has the possibility to run customized scripts. Praat can therefore be employed for acoustic voice analysis for clinical, educational, and research purposes; however, under the condition that voice signals are sampled for sufficient recording quality. This text first addresses recording-related issues and subsequently describes how Praat can be operated to yield numerical and graphical information regarding, for example, fundamental frequency, sound level, spectrum, spectrogram, cepstrum, and cepstrogram.

scholarly journals Statistical tests against systematic errors in data sets based on the equality of residual means and variances from control samples: theory and applications

2015 ◽  
Vol 71 (2) ◽  
pp. 203-211 ◽  
Author(s):  
Julian Henn ◽  
Kathrin Meindl
Keyword(s):  
Experimental Data ◽  
Statistical Tests ◽  
Gaussian Function ◽  
Systematic Errors ◽  
Data Sets ◽  
Artificial Data ◽  
Mean Values ◽  
Significance Level ◽  
Statistical Fluctuations ◽  
Control Samples

Statistical tests are applied for the detection of systematic errors in data sets from least-squares refinements or other residual-based reconstruction processes. Samples of the residuals of the data are tested against the hypothesis that they belong to the same distribution. For this it is necessary that they show the same mean values and variances within the limits given by statistical fluctuations. When the samples differ significantly from each other, they are not from the same distribution within the limits set by the significance level. Therefore they cannot originate from a single Gaussian function in this case. It is shown that a significance cutoff results in exactly this case. Significance cutoffs are still frequently used in charge-density studies. The tests are applied to artificial data with and without systematic errors and to experimental data from the literature.

scholarly journals Effects of Type 3 Thyroplasty on Voice Quality Outcomes in Puberphonia

2014 ◽  
Vol 29 (1) ◽  
pp. 6-10 ◽  
Author(s):  
Kanishka Chowdhury ◽  
Somnath Saha ◽  
Sudipta Pal ◽  
Indranil Chatterjee
Keyword(s):  
Fundamental Frequency ◽  
Acoustic Analysis ◽  
Voice Quality ◽  
Voice Therapy ◽  
P Value ◽  
Voice Analysis ◽  
Tertiary Referral Hospital ◽  
Quality Outcomes ◽  
Laryngeal Framework Surgery ◽  
Type 3

Objective: To assess effects of type 3 thyroplasty on outcomes of voice quality in puberphonia. Methods: Design: Prospective Cohort Setting: Tertiary Referral Hospital Participants: 6 patients with puberphonia who failed voice therapy, aged 16-25 years, who consulted at the ENT Outpatient department between September 2010 and September 2012, underwent type 3 thyroplasty. Pre-operative and 6-month post-operative voice analysis by voice recordings, Voice Handicap Index (VHI), GRBAS score and real time acoustic analysis (perturbation) using Dr Speech software (University version 4.0, Voice Tech Corporation, USA [Tiger Electronics]) using habitual fundamental frequency (F0), jitter % and shimmer % as parameters, were performed.   Results: Mean pre-operative VHI and GRBAS scores were 53 and 75.67 respectively whereas post-operative scores were 29 and 25.00 respectively. (P-value for VHI was 0.004 and that of GRBAS was 0.00). On acoustic analysis, mean pre-operative habitual fundamental frequency (F0), jitter % and shimmer % was 245.82 Hz, 0.21 and 2.34 respectively whereas post-operative mean was 140.78 Hz (P = 0.00), 0.19 (P = 0.04) and 1.52 (P = 0.00) respectively.   Conclusion: The mainstay of treatment of puberphonia is voice therapy. Thyroplasty provides a suitable management option in those cases who fail to respond by voice therapy.   Keywords: puberphonia, thyroplasty, laryngeal framework surgery, voice analysis

scholarly journals A simple high-speed random number generator with minimal post-processing using a random Raman fiber laser

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Frédéric Monet ◽  
Jean-Sébastien Boisvert ◽  
Raman Kashyap
Keyword(s):  
Fiber Laser ◽  
High Speed ◽  
Random Number ◽  
Statistical Tests ◽  
Random Number Generator ◽  
Random Number Generation ◽  
Nonlinear Effects ◽  
Post Processing ◽  
Significance Level ◽  
Raman Fiber Laser

AbstractA simple novel method for random number generation is presented, based on a random Raman fiber laser. This laser is built in a half-open cavity scheme, closed on one side by a narrow-linewidth 100 mm fiber Bragg grating. The interaction between the randomly excited lasing modes of this laser, in addition to nonlinear effects such as modulation instability, allow the generation of random bits at rates of up to 540 Gbps with minimal post processing. Evaluation of the resulting bit streams’ randomness by the NIST statistical test suite highlights the importance of evaluating the physical entropy content, as bit sequences generated by this random laser pass all the statistical tests with a significance level of 0.01, despite being generated at more than twice the theoretical entropy generation speed.

Articulatory Behavior Pre and Post Full-Mouth Tooth Extraction and Alveoloplasty

1980 ◽  
Vol 23 (3) ◽  
pp. 630-645 ◽  
Author(s):  
Gerald Zimmermann ◽  
J.A. Scott Kelso ◽  
Larry Lander
Keyword(s):  
Control Subject ◽  
High Speed ◽  
Tooth Extraction ◽  
Kinematic Parameters ◽  
Experimental Conditions ◽  
Mean Values ◽  
Articulatory Movements ◽  
The Mean ◽  
Experimental Subjects ◽  
Normal Speech

High speed cinefluorography was used to track articulatory movements preceding and following full-mouth tooth extraction and alveoloplasty in two subjects. Films also were made of a control subject on two separate days. The purpose of the study was to determine the effects of dramatically altering the structural dimensions of the oral cavity on the kinematic parameters of speech. The results showed that the experimental subjects performed differently pre and postoperatively though the changes were in different directions for the two subjects. Differences in both means and variabilities of kinematic parameters were larger between days for the experimental (operated) subjects than for the control subject. The results for the Control subject also showed significant differences in the mean values of kinematic variables between days though these day-to-day differences could not account for the effects found pre- and postoperatively. The results of the kinematic analysis, particularly the finding that transition time was most stable over the experimental conditions for the operated subjects, are used to speculate about the coordination of normal speech.

Challenges in perspective of life skills acquisition; implication for placement of life skills in university curriculum

2020 ◽  
Vol 24 (4) ◽  
pp. 189-194
Author(s):  
Wasim Khan ◽  
Salahuddin Khan ◽  
Tasleem Arif ◽  
Sohail R. Khan
Keyword(s):  
Life Skills ◽  
Student Athletes ◽  
Statistical Tests ◽  
Sampling Technique ◽  
Simple Random Sampling ◽  
Target Population ◽  
Skills Acquisition ◽  
Significance Level ◽  
Khyber Pakhtunkhwa ◽  
Educational Curriculum

Background and Study Aim: The main purpose behind the study was to establish the challenges in relation to the acquisition of life skills among university student-athletes of Khyber Pakhtunkhwa. The study assessed the extent to which the concern existing resources, facilitators, and trainer attitude influences life skills acquisition among student-athletes. Material and Methods: Descriptive survey research design was followed to obtain desirable results. The target population of this study consisted of all those who participated in different sport at the university level of Khyber Pakhtunkhwa (KP), Pakistan. Amongst them, we selected a representative sample (n=389 fifty 50% of the total population) with the help of a simple random sampling technique. The Statistical Package for Social Sciences (SPSS) version, 24 was used to code and analyse the data. The hypotheses were tested by applying statistical tests like Step-wise regression and independents sample t-test. The significance level of 0.05 was fixed to accept or reject the set hypotheses. Results: Findings of the study indicated that existing resources, facilitators, and trainer/coach attitude significantly influences life skills acquisition among student-athletes (.001, .001 & .000 < .05). The analysed data revealed no significantly difference regarding extent to which specific challenges such as existing resources, facilitators, and trainer attitude influences the acquisition of life skills (.500, .133 & .149 > .05). Conclusions: The findings of the study revealed that all participants have agreed upon the importance of life skills. Therefore, the life skills course might be considered as an integral part of every educational curriculum of Pakistan. It is suggested that a minimum of 2 hours per week may be included in the educational curriculum of each discipline.

POTRET PERILAKU RELIGIUS MAHASISWA UIN SAYARIF HIDAYATULLAH JAKARTA

Al-Risalah ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 126-148
Author(s):  
Ay Maryani
Keyword(s):  
Religious Behavior ◽  
Male And Female ◽  
Mean Values ◽  
Significance Level ◽  
Average Value ◽  
Environment Variable ◽  
Independent Variable ◽  
The Mean ◽  
Gender Factor ◽  
Level 2

This study describes the religious behavior of UIN Syarif Hidayatullah Jakarta students. The variables used are internal and external environment as independent variable and religious behavior as dependent variable. The internal environment variable consists of gender factor, (male and female). The external environmental variables comprise the faculty environment, the present resident and the place to grow. The present resident consist of dormitories, boarding houses and parents' homes and the place to grow consist of urban and rural environment. Religious behavior variables consist of habluminallah behavior and habluminannas behavior. Habluminallah's behavior measured by (1) knowledge of faith and worship, (2) attitudes toward faith and worship, and (3) practice of faith and worship. The habluminannas variable measured by (1) Islamic behavior for them self, like honest, discipline and good work / studyethics, trust and concern on legality, (2) Islamic behavior with others, like generous, cooperation, caring, respect to the people's rights and tolerance and (3) Islamic behavior for the natural surroundings, like love of nature and nature conservation efforts. The methodology used was (1) Statistical descriptive, (2) MANOVA (Multivariate Analysis of Variance) and (3) Independent sample t-test. The results showed the religious behavior UIN Syarif Hidayatullah Jakarta students has a very good category. This is indicated by the mean values for the behavior of haluminallah and habluminannas of 158.85 and 178.76,  espectively. The average value of habluminallah behaviour in the range of values "145-180" with the category of "very good" and habluminannas behavior in the range value "165-205" with the category "very good. Habluminallah and habluminannas behavior are different for each faculty. This is indicated by the significance level of Pillai Trace, Wilk Lambda, Hotelling Trace, Roy's Largest Root of 0.00 (<0.05). Habluminallah and habluminannas behavior are the same for respondents who live in dormitories, boarding houses, and parents' homes. This is indicated by the value of F test and significance at Wilk's Lambda respectively for 2.055 and 0.085 (>0.05). Habluminallah and habluminannas behaviors are similar for urban and rural respondents. This is known from the sig level. (2-tailed) for habluminallah and habluminannas behavior of 0.317 and 0.245 (> 0.05), respectively. Habluminallah and habluminannas behaviors are similar for male and female. This is known from the sig level. (2-tailed) for habluminallah and habluminannas behavior of 0.950 and 0.307 (> 0.05),respectively. The results of this study are expected to be used to develop university policies that can enhance the Islamic values of UIN Syarif Hidayatullah Jakarta.

Sensitivity of bioelectrical impedance to detect changes in human body composition

1989 ◽  
Vol 67 (4) ◽  
pp. 1643-1648 ◽  
Author(s):  
R. Ross ◽  
L. Leger ◽  
P. Martin ◽  
R. Roy
Keyword(s):  
Body Composition ◽  
Human Body ◽  
Correlation Coefficients ◽  
Bioelectrical Impedance ◽  
Mean Values ◽  
Significance Level ◽  
Exercise Regimen ◽  
Before And After ◽  
Hydrostatic Weighing ◽  
Human Body Composition

The purpose of this study was to compare the estimates of lean body mass (LBM) and percent body fat (%BF), as predicted by bioelectrical impedance (BIA) and sum of skinfolds (SF), with those derived by hydrostatic weighing (HW) obtained before and after a 10-wk diet and exercise regimen. The experimental (E) group consisted of 17 healthy male subjects; 20 healthy males served as the control (C) group. Post hoc Scheffe contrasts computed on E group data indicated that, for both LBM and %BF, the Lukaski and Segal BIA equations, as well as the Durnin SF equation, derived mean values that were not significantly different (0.05 significance level) from HW in both pre- and postregimen conditions. For LBM, the same equations derived the following significant (P less than 0.01) correlation coefficients for both pre- and postregimen data: Lukaski, 0.87 and 0.85; Segal, 0.89 and 0.87; and Durnin, 0.90 and 0.88. For %BF, the correlation coefficients were slightly lower but remained statistically significant (P less than 0.01). The findings of this study suggest that the BIA method, by use of either the Lukaski or Segal prediction equations, is a valid means of predicting changes in human body composition as measured by the Siri transformation of body density.

The dynamic amplification factors for continuous beam bridges along high-speed railways

2021 ◽  
pp. 136943322110032
Author(s):  
Lin Ma ◽  
Wei Zhang ◽  
Steve C.S. Cai ◽  
Shaofan Li
Keyword(s):  
Fundamental Frequency ◽  
High Speed ◽  
Continuous Beam ◽  
Empirical Formulas ◽  
High Speed Railway ◽  
Amplification Factors ◽  
Girder Bridges ◽  
Continuous Beam Bridge ◽  
Train Speed ◽  
Dynamic Amplification

In this paper, the dynamic amplification factors (DAFs) of high-speed railway continuous girder bridges are studied. The vehicle-bridge interactions (VBIs) of 13 concrete continuous girder bridges with spans ranging from 48 to 130 m are analyzed, the influences of the train speed, the train marshalling and the bridge fundamental frequency on the DAF are investigated, and the DAF design standard for high-speed railway bridges is discussed. The results indicate that for the continuous beam bridge whose fundamental frequency is less than 3.0 Hz, the maximum DAF is no more than 1.15; while for the bridge examples with a fundamental frequency larger than 3.0 Hz, the maximum DAF reaches 1.25 because the resonance occurs at high train speed. The empirical formulas of the DAFs in the Japan Railway Technical Research Institute (JRTRI) code could provide a conservative estimation of the DAFs of high-speed railway continuous bridges.

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