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Combination of Recurrent Fuzzy Filter and Hidden Markov Model for Noisy Birdsong and Human Speech Recognition
Human Speech Detection and Recognition
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Birdsong and Human speech recognition by Recurrent Fuzzy Network Filtered Hidden Markov Model (RFNF-HMM) in variable noise-level environments is proposed in this thesis. Birdsong and Human Speech are generated in a similar way and a similar recognition approach is proposed in this thesis. For birdsong recognition, the energy parameter is used to segment a significant portion from a birdsong sequence. Then, the linear predictive coding (LPC) coefficients of each frame in the segmented birdsong are extracted and used as feature vectors. These feature vectors are fed as inputs to HMM recognizers. Birdsong in outside practical environments are usually corrupted by non-stationary noise or other interference, which degrades recognition performance. To handle this problem, RFNF-HMM recognizer is proposed, where each HMM is connected with a RFNF for noise filtering in feature domain. Experiments in recognition of ten species of birds in Taiwan according to birdsongs are performed. For Human speech recognition in variable noise-level environments, Wavelet Energy (WE) and Zero Crossing Rate (ZCR) are proposed as detection parameters for word boundary detection. Three kinds of Intelligent Learning Networks (ILN) are used as detectors with their performance being compared. They are RSONFIN, Fuzzy System learned through the combination of Fuzzy Clustering and Support Vector Machine (FS-FCSVM), and Gaussian kernel SVM. After words detection, the cepstral coefficients are used as features and RFNF-HMM are used as recognizers. In experiments, words detection performance is evaluated both by Receiver Operator Characteristic (ROC) curves and recognition rates. Experimental results show that the proposed detection parameters are robust and effective with comparisons to the Refined Time-Frequency (RTF) parameters. Admiring recognition rates in human speech recognition with different types of unknown noises in variable noise-level environments are achieved in experiments.
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