{HEAD ~ Each} of the frames comprises a mixed signal containing a speech signal and {TAIL ~ a noise signal} 
{ HEAD ~ Each } of the frames comprises a mixed signal containing a speech signal and { TAIL ~ a noise signal }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL