Responsive to detecting that the decoded audio frame includes the distortion, operations are performed on {HEAD ~ the decoded audio signal} to conceal {TAIL ~ the distortion} 
to conceal
Responsive to detecting that the decoded audio frame includes the distortion , operations are performed on { HEAD ~ the decoded audio signal } to conceal { TAIL ~ the distortion }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL