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Emotion is a vital component in daily human communication and it helps people understand each other. Emotion recognition plays a crucial role in developing human-computer interaction and computer-based speech emotion recognition. In a nutshell, Speech Emotion Recognition (SER) recognizes emotion signals transmitted through human speech or daily conversation where the emotions in a speech strongly depend on temporal information. Despite the fact that much existing research showed that a hybrid system performs better than traditional single classifiers used in SER, there are some limitations in each of them. As a result, this paper discussed a proposed hybrid Long Short-Term Memory (LSTM) Network and Transformer Encoder to learn the long-term dependencies in speech signals and classify emotions. Speech features are extracted with Mel Frequency Cepstral Coefficient (MFCC) and fed into the proposed hybrid LSTM-Transformer classifier. A range of performance evaluations was conducted on the proposed LSTM-Transformer model. The results indicate that it achieves a significant recognition improvement compared with existing models offered by other published works. The proposed hybrid model reached 75.62&#x0025;, 85.55&#x0025;, and 72.49&#x0025; recognition success with the RAVDESS, Emo-DB, and language-independent datasets.

Hybrid LSTM-Transformer Model for Emotion Recognition From Speech Audio Files