Grzegorz Szwoch Andrzej Czyzewski Maciej Kulesza A low complexity double-talk detector based on the signal envelope. 2856-2862 2008 88 Signal Processing 11 http://dx.doi.org/10.1016/j.sigpro.2008.05.013 db/journals/sigpro/sigpro88.html#SzwochCK08