If  if you compare th the two shut channels of SpeechDat - Car during speech portion , it 's n n n the MFCC are not very different. They are very different when energy 's lower , like during fricatives or during speech pauses. And ,
Yeah , but you 're still getting more recognition errors ,
uh
which means  that the differences , even though they look like they 're not so big ,  are  are hurting your recognition.