Say that again ? Frame over fres threshold.
So you take a  each frame , and you compute the energy and if it 's over the threshold you set it to one , and if it 's under the threshold you set it to zero ,  so now you have a bit stream  of zeros and ones.
Hmm. OK.
And then I median - filtered that  using , um  a fairly long  filter length. Uh  well , actually I guess depends on what you mean by long , you know , tenth of a second sorts of numbers. Um and that 's to average out you know , pitch , you know , the pitch contours , and things like that. And then , uh looked for long runs.