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Fuzzy-Neural-Network Based Audio-Visual Fusion for Speech Recognition

Speech recognition is an important classification problem in signal processing. Its performance is easily affected by noisy environment due to movements of desks, door slams, etc. To solve the problem, a fuzzy-neural-network based audio-visual fusion is proposed in this study. Since human speech perception is bimodal, the input features include both audio and image information. In the fuzzy-neural-network, type-2 fuzzy sets are used in the antecedent parts to deal with the noisy data. Furthermore, a linear-discriminant-analysis (LDA) is applied in to the consequent parts to increase the “discriminability”. Compared with pure audio-based speech recognition, the fuzzy-neural-network based audio-visual fusion method is more robust in noisy environment.