Medidas cepstrais na avaliação da intensidade do desvio vocal

Abstract

RESUMO Objetivo Analisar se existe associação entre a presença, a intensidade e o tipo de desvio vocal e as medidas cepstrais em amostras de indivíduos com queixa vocal. Método Foram utilizadas 376 amostras da vogal /ε/ de indivíduos de ambos os gêneros, com queixa vocal. Utilizou-se uma escala analógico-visual para análise perceptivo-auditiva das vozes quanto à intensidade do desvio vocal (GG), graus de rugosidade (GR), soprosidade (GS) e tensão (GT), incluindo-se a determinação da qualidade vocal predominante (rugosa, soprosa ou tensa). Foram extraídas as medidas relacionadas ao Cepstral Peak Prominence-Smoothed (CPPS) e o declínio espectral das amostras vocais. Resultados Houve diferença dos valores do CPPS entre os grupos com e sem desvio vocal, assim como entre as diferentes intensidades e tipos de desvio vocal. Os valores do CPPS foram mais reduzidos em função da presença e intensidade do desvio vocal. Os valores do CPPS diferenciaram vozes rugosas x soprosas, rugosas x tensas e soprosas x tensas. O declínio espectral apenas diferenciou vozes soprosas x tensas. O CPPS se correlacionou de modo positivo e forte com os GG e GS, de modo negativo moderado com o GR, e de forma negativa fraca com o GT. O declínio espectral apresentou correlação positiva moderada com o GT e correlação negativa fraca com o GS. Conclusão Existe associação entre a presença de desvio vocal, o GG, a qualidade vocal predominante e o CPPS. De modo especial, o GG é fortemente correlacionado ao CPPS. O declínio espectral está associado apenas aos parâmetros de soprosidade e tensão.

Relationship of Cepstral Peak Prominence-Smoothed and Long-Term Average Spectrum with Auditory–Perceptual Analysis

“…At last, the current study corroborates previous studies that analyzed other populations, such as vocally healthy and dysphonic women [4], participants with unilateral vocal fold paralysis [17], and analysis of sustained vowel in only dysphonic participants (women and men) [18]. Thus, the current study contributes to scientific evidence regarding the relationship and complementarity of the analysis of robust acoustic measures (CPPs, alpha ratio, and L1-L0).…”

“…They found that CPPs had a strong negative correlation with general degree and breathiness parameters of auditory-perceptual analysis. At last, Lopes et al [18] analyzed the correlations between CPPs and auditory-perceptual parameters in a dysphonic group from vowel emission. They found that CPPs had a moderate negative correlation with general degree, roughness, and breathiness parameters of vocal quality, and weak negative correlation with strain parameter.…”

“…We observed that previous studies only analyzed CPPs in vocally healthy and dysphonic (behavioral dysphonia) women [4], participants with unilateral vocal fold paralysis (organic dysphonia) [17], and participants with behavioral dysphonia by only using sustained vowel [18]. At last, one study analyzed how emotional patterns affect LTAS measures.…”

Auditory-perceptual and acoustic measures in women with and without vocal nodules

“…The auditory-perceptual assessment considers the description of the voice signal through human hearing. Even though it is a subjective analysis, it is pointed out as the main method to assess voice disorders (4,5) . Hence, the effort to find an objective voice assessment led to progress in voice analysis, helping to understand the relationship between physiology (input) and auditory acoustic sound signal (voice output) (6,7) .…”

“…The acoustic analysis provides visual and normative data on the glottal source and voice filter (6,8) . Some acoustic measures furnish quantitative data on the glottal source -e.g., the fundamental frequency (f0), defined by the number of vibrations per second produced by the vocal folds; jitter, the short-term variation in the fundamental frequency; shimmer, which indicates the shortterm amplitude variability of the wave sound; glottal-to-noise excitation (GNE), which verifies the additional noise in the voice signal; and cepstral peak prominence-smoothed (CPPS), which determines the f0 and estimates the aperiodicity and/or additional noise in the voice signal (4,5,7) .…”