Yeah.
What  one  one um p one thing is like what  before we started using this VAD in this Aurora , the  th what we did was like , I  I guess most of you know about this , adding this additional speech - silence bit to the cepstrum and training the HMM on that.
Mm - hmm.
That is just a binary feature and that seems to be  improving a lot on the SpeechDat - Car where there is a lot of noise but not much on the TI - digits. So , a adding an additional feature to distin to discriminate between speech and nonspeech was helping. That 's it.