12 documents found, page 1 of 2
Classificação de pacientes diagnosticados com ELA através de parâmetros espetra...
Cotter, Sofia; Cordeiro, Hugo; Marques, GonçaloEste trabalho propõe métodos de discriminação automática entre pacientes diagnosticados com Esclerose Lateral Amiotrófica (ELA) bulbar e oradores saudáveis, a partir da extração de parâmetros do espetro de sinais de voz. Os testes com validação cruzada obtiveram uma taxa de acertos máxima num conjunto de teste de 80% e 82.4%, com os classificadores Linear Discriminant Analysis e Support Vector Classifier, respe...
Voice spectrum energy band and tilt analysis for Bulbar ALS screening
Cordeiro, Hugo; Meneses, CarlosThis paper presents a comparison between the spectral analysis of the voices from patients diagnosed with bulbar amyotrophic lateral sclerosis (ALS) and healthy speakers. The main objective is to understand how this disease affects the voice and, consequently, the spectrum of the patients' voices. The spectrum is analysed in three energy bands, where energy peaks are estimated and the tilt between these bands i...
Deteção de ELA através de análise espectral: novo parâmetro e otimizações
Cordeiro, Hugo; Meneses, CarlosA análise da média e desvio padrão de parâmetros baseados no declive espectral dos sinais de fala demonstrou em trabalhos anteriores capacidade de discriminação entre oradores diagnosticados com Esclerose Lateral Amiotrófica (ELA) Bulbar e oradores saudáveis. Este trabalho continua a investigação do espectro do sinal de fala neste contexto e apresenta uma solução que funde os parâmetros apresentados anteriormen...
Espectro de voz de pacientes diagnosticados com ELA bulbar: Análise do declive ...
Cordeiro, Hugo; Meneses, CarlosEste estudo apresenta uma comparação entre a análise espetral de vozes de pacientes diagnosticados com Esclerose Lateral Amiotrófica (ELA) bulbar e oradores saudáveis. O principal objetivo é entender de que modo esta doença afeta a voz e consequentemente o espectro das vozes dos pacientes. Os espectros são analisados em duas bandas de energia, onde são caracterizados picos de energia e consequentemente também o...
Parâmetros espectrais de vozes saudáveis e patológicas: Comparação de resultado...
Cordeiro, Hugo; Meneses, CarlosEste artigo apresenta um estudo comparativo entre três parâmetros espectrais na discriminação entre vozes saudáveis e patológicas. Os parâmetros avaliados envolvem a análise do primeiro pico espectral, uma medida da relação sinal-ruído e o declive entre duas bandas de baixa frequência do sinal de fala. O declive entre as bandas de baixa frequência é proposto como otimização do primeiro pico espectral, de modo a...
Spectral features of healthy and pathological voices: results comparison betwee...
Cordeiro, Hugo; Meneses, CarlosThis paper presents a comparative study between three spectral parameters in the discrimination between healthy and pathological voices. The evaluated parameters involve the analysis of the first spectral peak, the Relative Power of the Periodic Component, which corresponds to a measure of the signal-to-noise ratio and the Low Band Spectral Tilt. The Low Band Spectral Tilt is proposed as optimization of the fir...
Low band spectral tilt analysis for pathological voice discrimination
Cordeiro, Hugo; Meneses, CarlosThis paper presents a new method for discriminating between subjects with healthy voices and subjects with diseases in the vocal folds. This method uses speech signals and spectral analysis of the sustained vowel /a/. The slope between a first band of the signal defined in the first two harmonics and a second band defined in the zone of the /a/ first formant contains information that allows to correctly classif...
Low band continuous speech system for voice pathologies identification
Cordeiro, Hugo; Meneses, CarlosThis paper describes the impact of the signal bandwidth reduction in the identification of voice pathologies. The implemented systems evaluate the identification of 3 classes divided by healthy subjects, subjects diagnosed with physiological larynx pathologies and subjects diagnosed with neuromuscular larynx pathologies. Continuous speech signals are down-sampled to 4 kHz and the extracted spectral parameters a...
Hierarchical classification and system combination for automatically identifyin...
Cordeiro, Hugo; Fonseca, Jose; Guimarães, Isabel; Meneses, CarlosObjectives. Speech signal processing techniques have provided several contributions to pathologic voice identification, in which healthy and unhealthy voice samples are evaluated. A less common approach is to identify laryngeal pathologies, for which the use of a noninvasive method for pathologic voice identification is an important step forward for preliminary diagnosis. In this study, a hierarchical classifie...
Hierarchical classification and system combination for automatically identifyin...
Cordeiro, Hugo; Fonseca, José; Guimarães, Isabel; Meneses, CarlosObjectives. Speech signal processing techniques have provided several contributions to pathologic voice identification, in which healthy and unhealthy voice samples are evaluated. A less common approach is to identify laryngeal pathologies, for which the use of a noninvasive method for pathologic voice identification is an important step forward for preliminary diagnosis. In this study, a hierarchical classifie...