Neural Networks applied to System of Speech Recognition based on DCT Parametric Models of Low Order
Priscila Lima Rocha1; Washington Luis Santos Silva2; Allan Kardec Barros Duailibe Filho1
1 Universidade Federal do Maranhão; 2 Instituto Federal do Maranhão
Resumo
This paper proposes the development of a Numerical Command Recognition System of Speech Signal based on Neural Networks and DCT models. Thus, two configurations of neural networks, the Multilayer Perceptron and Learning Vector Quantization are evaluated by their performance in speech signal recognition, whose encoding is made by the mel-cepstral coefficients that are used to generate a two-dimensional time matrix by Discrete Cosine Transform (DCT). The selection of the best configuration of neural network for classification of the patterns was carried out by comparative analysis of performance of the MLP and LVQ networks through training, validation and test of the network topology and learning algorithms previously established. For demonstration of the performance of the proposed analysis methodology, the obtained results were compared with other methods of classification given by Gaussian Mixture Models (GMM) and Support Vector Machines (SVM).
Palavras-chave: Automatic Speech Recognition; Neural Network; Discrete Cosine Transform