Adaptive fuzzy filter for speech enhancement

Authors:
Chih-Chia Yao;Ming-Hsun Tsai
Affiliations:
Department of Computer Science and Information Engineering, Chaoyang University of Technology, Wufong, Taichung, Taiwan;Department of Computer Science and Information Engineering, Chaoyang University of Technology, Wufong, Taichung, Taiwan
Venue:
ICCSA'10 Proceedings of the 2010 international conference on Computational Science and Its Applications - Volume Part III
Year:
2010

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Abstract

In this paper an adaptive fuzzy filter, based on fuzzy system, is proposed for speech signal enhancement and automatic speech recognition accuracy. In the past two decades the basic wavelet thresholding-algorithm has been widely studied and is common applied to filter noise. In the proposed system adaptive wavelet thresholds are generated and controlled by fuzzy rules concerning the presence of speech in noise. First an amplified voice activity detector is designed to improve performance on SNR lower than 5dB. Then an adaptive threshold decision module based on fuzzy inference system is proposed. In this fuzzy inference system overall relations between speech and noise are summarized into seven fuzzy rules and four linguistic variables, which are used to detect the state of signals. The adaptive threshold and membership functions are optimally obtained by particle swarm optimization algorithm so the SNR of the filter output for training signal data can be maximized. Experimental results reveal that our proposed system effectively increases the SNR and the recognition rate of speech.