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.
Wait  I  I 'm sorry ?
Yeah , we actually added an additional binary feature to the cepstrum , just the baseline.