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