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