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how to set the threshold for classifying speech signal and silence

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RAHIBA
RAHIBA 2015-2-9
Hello,all As a part of my project, I need to use Matlab for voice/unvoice separation of the recorded speech file.For now I can record a file in Matlab, and calculate Zerro-Crossing Rate(ZCR) and frame energy. high energy is voiced sound and less energy is unvoiced sound. But I cant set the threshold for classifying voiced and unvoiced speech. Please help me to set the threshold. Thank you in advance. -----------Rahiba

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