RESEARCH HIGHLIGHTS:▶ Characterization of emotions based on the acoustical and
prosodic features.▶ Emotional groups are founded in an unsupervised way (SOM) and
spectral analysis.▶ New hierarchical schema to classify emotions is supported by acoustic
analysis.▶ Some features/algorithms perform better in particular emotional
groups/emotions.▶ Multiple feature hierarchical classifier increases baselines classification
results. ABSTRACT: The recognition of the emotional state of speakers is a multi-disciplinary …