1D-CNN: Speech Emotion Recognition System Using a Stacked Network with Dilated CNN Features

Mustaqeem Mustaqeem · Soonil Kwon

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Emotion and Mood Recognition Speech Recognition and Synthesis Speech and Audio Processing

Abstract

Emotion recognition from speech data is an active and emerging area of research that plays an important role in numerous applications, such as robotics, virtual reality, behavior assessments, and emergency call centers. Recently, researchers have developed many techniques in this field in order to ensure an improvement in the accuracy by utilizing several deep learning approaches, but the recognition rate is still not convincing. Our main aim is to develop a new technique that increases the recognition rate with reasonable cost computations. In this paper, we suggested a new technique, which is a one-dimensional dilated convolutional neural network (1D-DCNN) for speech emotion recognition (SER) that utilizes the hierarchical features learning blocks (HFLBs) with a bi-directional gated recurrent unit (BiGRU). We designed a one-dimensional CNN network to enhance the speech signals, which uses a spectral analysis, and to extract the hidden patterns from the speech signals that are fed into a stacked one-dimensional dilated network that are called HFLBs. Each HFLB contains one dilated convolution layer (DCL), one batch normalization (BN), and one leaky_relu (Relu) layer in order to extract the emotional features using a hieratical correlation strategy. Furthermore, the learned emotional features are feed into a BiGRU in order to adjust the global weights and to recognize the temporal cues. The final state of the deep BiGRU is passed from a softmax classifier in order to produce the probabilities of the emotions. The proposed model was evaluated over three benchmarked datasets that included the IEMOCAP, EMO-DB, and RAVDESS, which achieved 72.75%, 91.14%, and 78.01% accuracy, respectively.

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References

2008IEMOCAP: interactive emotional dyadic motion capture database 2005A database of German emotional speech 2018The Ryerson Audio-Visual Database of Emotional Speech and Song (RAVDESS): A dynamic, multimodal set of facial and vocal expressions in North American English 2018Speech emotion recognition using deep 1D & 2D CNN LSTM networks 2014Speech emotion recognition using deep neural network and extreme learning machine 2019Speech Emotion Recognition Using Deep Learning Techniques: A Review 2020Speech emotion recognition with deep convolutional neural networks 2014Learning Salient Features for Speech Emotion Recognition Using Convolutional Neural Networks

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