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