A. Davis Sven Nordholm Roberto Togneri Statistical voice activity detection using low-variance spectrum estimation and an adaptive threshold. 412-424 2006 14 IEEE Transactions on Audio, Speech & Language Processing 2 http://doi.ieeecomputersociety.org/10.1109/TSA.2005.855842 db/journals/taslp/taslp14.html#DavisNT06