Typically, some subband data is replaced with {HEAD ~ zeros} so that an error causes some of {TAIL ~ the frequency components} to be lost 
Typically , some subband data is replaced with { HEAD ~ zeros } so that an error causes some of { TAIL ~ the frequency components } to be lost
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH