Uh.
Mm - hmm.
if s @ @  val value is indicative that is a voice frame and it 's low values
Yeah. Yeah. Well , you probably want  I mean ,  certainly if  you want to do good voiced - unvoiced detection , you need a few features. Each  each feature is  by itself not enough. But , you know , people look at  at slope and  uh first auto - correlation coefficient , divided by power.