Percorrer por autor "Pestana, Pedro"
A mostrar 1 - 2 de 2
Resultados por página
Opções de ordenação
- The agreement between a transducer and a microphone in the analysis of a synthesized vowel—Using a laboratory model as a preliminary experimentPublication . Pestana, Pedro; Byrne, Allison; Alegria, Rita; Araújo, André; Melo, Celso; Brasil, Christina César Praça; Manso, Maria Conceição; Guerreiro Martins Araújo, Pedro AndréThe objective of this study was to assess the agreement between the acoustic parameters of synthesized vowels, as measured by a piezoelectric transducer and a microphone. The central hypothesis posited that there would be a substantial degree of concordance between the acoustic parameters obtained by these two methods. A laboratory experiment was conducted using synthesized vowels. Acoustic parameters were recorded simultaneously using a microphone and a piezoelectric transducer. Vowels were synthesized using Madde software, with variations in fundamental frequency (fo) and amplitude level. Acoustic signals were captured by a Shure MX153 T microphone and a Shadow SH712 piezoelectric transducer. Signals were recorded using a Behringer FCA1616 audio interface and analyzed using Sopran and VOXplot software. Bland–Altman plots were used for statistical comparison of acoustic parameters. The degree of agreement between the microphone and the transducer varied according to acoustic parameters. Excellent agreement was observed for jitter, mean fo, fo standard deviation, and fo range. Good agreement was found for tilt, equivalent continuous sound level, harmonics-to-noise ratio from Dejonckere, high frequency noise, minimum fo, and maximum fo. Moderate agreement was observed for slope, amplitude difference H1–H2, shimmer, harmonics-to-noise ratio, smoothed cepstral peak prominence, and period standard deviation. While there was moderate to high agreement between the two methods for several acoustic parameters, discrepancies were noted. The microphone exhibited a tendency to record slightly higher values for the majority of the parameters; however, the transducer did demonstrate heightened sensitivity for certain parameters. The findings indicate that neither method can be universally interchanged with the other, and the selection of a method should be contingent on the particular requirements of the analysis.
- Risk factors for voice disorders among Fado singers: A cross-sectional studyPublication . Pestana, Pedro; Freitas, Susana Vaz; Manso, Maria ConceiçãoFado is an urban Portuguese musical style rooted in popular culture. Previously found data suggests that Fado singers may have an increased risk of developing voice disorders. To determine the risk factors for the development of voice disorders among Fado singers. A cross-sectional study was conducted through the administration of a questionnaire containing questions related to voice disorders in singers. The relationship between personal and social data, musical background, performance demands and habits, vocal health and wellbeing, and strategies to overcome voice problems are reported. Beyond a comprehensive characterization, odds ratios (ORs) and their 95% confidence intervals (CIs) for the association with voice disorders were calculated through univariate and multivariate logistic regression analyses. The significant risk factors for voice disorders were as follows in decreasing order: nose-related disorders; decongestants or antihistamines; oral contraceptives or hormone replacement therapy; previous smoking habits; and vocal fatigue after performances. These activities significantly increased the risk of developing voice disorders. The evidence from this study and the relative low prevalence of self-reported voice disorders suggest that these singers may develop a kind of protective combination of factors beyond the scope of this research.