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http://dx.doi.org/10.7776/ASK.2007.26.8.397

Voice Activity Detection Based on SVM Classifier Using Likelihood Ratio Feature Vector  

Jo, Q-Haing (인하대학교 전자전기공학부)
Kang, Sang-Ki (삼성전자 정보통신총괄 통신연구소)
Chang, Joon-Hyuk (인하대학교 전자전기공학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.26, no.8, 2007 , pp. 397-402 More about this Journal
Abstract
In this paper, we apply a support vector machine(SVM) that incorporates an optimized nonlinear decision rule over different sets of feature vectors to improve the performance of statistical model-based voice activity detection(VAD). Conventional method performs VAD through setting up statistical models for each case of speech absence and presence assumption and comparing the geometric mean of the likelihood ratio (LR) for the individual frequency band extracted from input signal with the given threshold. We propose a novel VAD technique based on SVM by treating the LRs computed in each frequency bin as the elements of feature vector to minimize classification error probability instead of the conventional decision rule using geometric mean. As a result of experiments, the performance of SVM-based VAD using the proposed feature has shown better results compared with those of reported VADs in various noise environments.
Keywords
Voice activity detection; Support vector machine; Statistical model; Likelihood ratio;
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