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A Simple Speech/Non-speech Classifier Using Adaptive Boosting  

Kwon, Oh-Wook (School of Electrical and Computer Engineering, Chungbuk National University)
Lee, Te-Won (Institute for Neural Computation, University of California)
Publication Information
The Journal of the Acoustical Society of Korea / v.22, no.3E, 2003 , pp. 124-132 More about this Journal
Abstract
We propose a new method for speech/non-speech classifiers based on concepts of the adaptive boosting (AdaBoost) algorithm in order to detect speech for robust speech recognition. The method uses a combination of simple base classifiers through the AdaBoost algorithm and a set of optimized speech features combined with spectral subtraction. The key benefits of this method are the simple implementation, low computational complexity and the avoidance of the over-fitting problem. We checked the validity of the method by comparing its performance with the speech/non-speech classifier used in a standard voice activity detector. For speech recognition purpose, additional performance improvements were achieved by the adoption of new features including speech band energies and MFCC-based spectral distortion. For the same false alarm rate, the method reduced 20-50% of miss errors.
Keywords
Speech/non-speech classification; Speech detection; Adaptive boosting; AdaBoost algorithm;
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