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A concordância da prominência do pico cepstral em vogais sintetizadas entre um microfone e um transdutor piezoelétrico: uma experiência em laboratório
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| Projeto de graduação_19724 | 377.54 KB | Adobe PDF |
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Objetivo: Avaliar a concordância entre os parâmetros acústicos, a prominência do pico cepstral (PPC) e a prominência do pico cepstral suavizada (PPCS), obtidos por um transdutor piezoelétrico e um microfone na análise de vogais sintetizadas.
Métodos: Seis vogais foram sintetizadas usando três frequências distintas e duas intensidades diferentes. Dois sinais foram gravados simultaneamente: um de um microfone posicionado próximo do altifalante (simulando a posição da cabeça humana) e o outro de um transdutor piezoelétrico colocado na membrana do altifalante. Um medidor de decibéis foi utilizado para calibrar todo o processo. A PPC a PPCS foram analisadas para cada vogal e os gráficos de Bland-Altman foram gerados para cada par de medição de parâmetros (microfone-transdutor).
Resultados: As linhas de média das diferenças foram próximas de zero, indicando um viés mínimo em todos os parâmetros. A dispersão das diferenças variou entre os parâmetros, mas não se observou nenhuma tendência consistente. Nenhuma medida se situou fora dos limites de concordância.
Conclusão: Os parâmetros investigados apresentaram um grau de concordância satisfatório entre o microfone e o transdutor piezoelétrico em vogais sintetizadas para o CPP e o CPPS. No entanto, a interpretação clínica destes resultados justifica uma investigação adicional.
Aim: The objective of this study is to assess the concordance between the acoustic parameters of peak cepstral prominence (PPC) and smoothed peak cepstral prominence (PPCS) as measured by a piezoelectric transducer and a microphone, respectively, in the context of the analysis of synthesized vowels. Methodology: The synthesis of six vowels was achieved through the utilisation of three distinct frequencies and two varying levels of intensity. The experiment involved the simultaneous recording of two signals: one from a microphone positioned in close proximity to the speaker (simulating the position of the human head) and the other from a piezoelectric transducer placed on the speaker's membrane. The calibration of the process was conducted using a decibel meter. The PPC and PPCS were analysed for each vowel, and Bland-Altman plots were generated for each parameter measurement pair (microphone-transducer). Results: The mean lines of the differences were found to be close to zero, indicating minimal bias in all parameters. The dispersion of the differences exhibited variability across the parameters; however, no consistent trend was identified. It was established that no measure fell outside the limits of agreement. Conclusion: The parameters investigated demonstrated a satisfactory degree of agreement between the microphone and the piezoelectric transducer in synthesised vowels for CPP and CPPS. However, the clinical interpretation of these results necessitates further investigation.
Aim: The objective of this study is to assess the concordance between the acoustic parameters of peak cepstral prominence (PPC) and smoothed peak cepstral prominence (PPCS) as measured by a piezoelectric transducer and a microphone, respectively, in the context of the analysis of synthesized vowels. Methodology: The synthesis of six vowels was achieved through the utilisation of three distinct frequencies and two varying levels of intensity. The experiment involved the simultaneous recording of two signals: one from a microphone positioned in close proximity to the speaker (simulating the position of the human head) and the other from a piezoelectric transducer placed on the speaker's membrane. The calibration of the process was conducted using a decibel meter. The PPC and PPCS were analysed for each vowel, and Bland-Altman plots were generated for each parameter measurement pair (microphone-transducer). Results: The mean lines of the differences were found to be close to zero, indicating minimal bias in all parameters. The dispersion of the differences exhibited variability across the parameters; however, no consistent trend was identified. It was established that no measure fell outside the limits of agreement. Conclusion: The parameters investigated demonstrated a satisfactory degree of agreement between the microphone and the piezoelectric transducer in synthesised vowels for CPP and CPPS. However, the clinical interpretation of these results necessitates further investigation.
Descrição
Projeto de Graduação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciada em Terapêutica da Fala.
Palavras-chave
Transdutor piezoelétrico Microfone Vogal sintetizada Comparação medidas acústicas Piezoelectric transducer Microphone Vowel synthesis Acoustic measurement comparison