Emotion recognition and retrieval in audio signals

Emotion recognition from audio signals become more of significance especially when visual information is limited or absent. In this study, a complete and extensible audio-based emotion recognition and retrieval framework is proposed. Support Vector Machine (SVM) is employed as the machine learning scheme and parameter optimization methods are carried out to improve the performance of the learner. In audio content analysis, empirical analyses are performed to decide the proper window and hop sizes. In the study, extensive analyses are conducted using 20 audio features with SVM classifier to determine robust audio features and to evaluate the results. In addition, flexible querying abilities, namely point, range, and nearest neighbor are developed and retrieval performance is evaluated for emotion-based retrieval of audio signals. Based on the experiments, parameter optimization of the classifier along with the proposed audio analysis methods improve the baseline recognition accuracy.