FDBN: Design and development of Fractional Deep Belief Networks for speaker emotion recognition

With an essential demand of human emotional behavior understanding and human machine interaction for the recent electronic applications, speaker emotion recognition is a key component which has attracted a great deal of attention among the researchers. Even though a handful of works are available in the literature for speaker emotion classification, the important challenges such as, distinct emotions, low quality recording, and independent affective states are still need to be addressed with good classifier and discriminative features. Accordingly, a new classifier, called fractional deep belief network (FDBN) is developed by combining deep belief network (DBN) and Fractional Calculus. This new classifier is trained with the multiple features such as tonal power ratio, spectral flux, pitch chroma and Mel frequency cepstral coefficients (MFCC) to make the emotional classes more separable through the spectral characteristics. The proposed FDBN classifier with integrated feature vectors is tested using two databases such as, Berlin database of emotional speech and real time Telugu database. The performance of the proposed FDBN and existing DBN classifiers are validated using False Acceptance Rate (FAR), False Rejection Rate (FRR) and Accuracy. The experimental results obtained by the proposed FDBN shows the accuracy of 98.39 and 95.88 % in Berlin and Telugu database.