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A voiced/unvoiced speech decision apparatus based on a statistical model and decision method thereof
A voiced/unvoiced speech decision apparatus based on a statistical model and decision method thereof
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机译：基于统计模型的有声/无声语音决策装置及其决策方法
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摘要
PURPOSE: An apparatus and a method for discriminating a voiced sound from an unvoiced sound based on a statistical model are provided to improve the performance of discriminating the voice and unvoiced sounds from each other through a simple calculation even in a noisy environment. CONSTITUTION: An apparatus for discriminating a voiced sound from an unvoiced sound includes a signal converter(100) for converting a speech signal including noise into a frequency signal, a noise power estimator(200) for estimating a noise power from the frequency signal, and the first likelihood ratio calculator(310) for calculating a decision rule of voice activity detection of the frequency signal in a low frequency band with reference to the estimated noise power. The apparatus further includes the second likelihood ratio calculator(320) for calculating a decision rule of voice activity detection of the frequency signal in a high frequency band with reference to the estimated noise power, and a final likelihood ratio tester(400) for calculating a likelihood ratio of the voice/unvoiced sounds on the basis of the likelihood ratios calculated by the first and second likelihood ratio calculators and compares the likelihood ratio to a predetermined threshold to determine voice/unvoiced sounds.
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