This paper proposes the application of measures based on nonlinear dynamics for emotional speech characterization. Measures such as mutual information, dimension correlation, entropy correlation, Shannon’s entropy, Lempel–Ziv complexity and Hurst exponent are extracted from the samples of a database of emotional speech. Then, summary statistics such as mean, standard deviation, skewness and kurtosis are applied on the extracted measures. Experiments were conducted on the Berlin emotional speech database for a three-class problem (neutral, fear and anger as emotional states). Feature selection is accomplished and a methodology is proposed to find the best features. In order to evaluate the discrimination ability of the selected features, a neural network classifier is used. The global success rate is 93.78 ± 3.18 %.
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This work has been funded by the Spanish government MCINN TEC2009-14123-C04 research project and a research training grant from the ACIISI of the Canary Autonomous Government (Spain) with a co-financing rate of 85 % from the European Social Fund (ESF). This work was also granted by CODI at Universidad de Antioquia, project MC11-1-03.
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Henríquez Rodríguez, P., Alonso Hernández, J.B., Ferrer Ballester, M.A. et al. Global Selection of Features for Nonlinear Dynamics Characterization of Emotional Speech. Cogn Comput 5, 517–525 (2013). https://doi.org/10.1007/s12559-012-9157-0