generating {HEAD ~ a U component partial error measure SAEu} in {TAIL ~ accordance} with the following equation: ##EQU20## wherein F is a function of u2 and ud , ur are the decoded U component signals corresponding to the decoded region, and ud are the U component signals corresponding to the reference region; and 
in
generating { HEAD ~ a U component partial error measure SAEu } in { TAIL ~ accordance } with the following equation : # # EQU20 # # wherein F is a function of u2 and ud , ur are the decoded U component signals corresponding to the decoded region , and ud are the U component signals corresponding to the reference region ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH