Estimation of pitch period in voice signals using Poincaré sections
Fernando Araujo de Andrade Sobrinho1; Maria Eugênia Dajer2; Luis Fernando Costa Alberto3
1 Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais, Poços de Caldas, Brazil; 2 2Universidade Tecnológica Federal do Paraná , Cornélio Procópio, Brazil; 3 3Universidade de São Paulo, São Carlos, Brazil
Resumo
Researchers reported instability in children voices due to physiological changes in laryngeal structures. The aim of this paper is to detect the Fundamental frequency F0 of healthy children voices using Poincaré Section technique (PST). The statistic T-test indicates thatmeasures of F0 using PST are compatible with those obtained with Fourier transform. Results indicate that PST is a promising tool for F0 analysis with the advantage of determining a fundamental frequency even in high nonlinear and non-periodic signals.
Palavras-chave: Time Series Analysis; Analysis and Control of Nonlinear Dynamical Systems with Practical Applications; Synchronization in Nonlinear Systems; Poincare Section; Nonlinear analysis