During subsequent training and run time phases of modem operation {HEAD ~ an oversampled digital input stream} is subject to {TAIL ~ digital Delta Sigma Modulation} with the analog model injected into the feedback path from the quantizer 
During subsequent training and run time phases of modem operation { HEAD ~ an oversampled digital input stream } is subject to { TAIL ~ digital Delta Sigma Modulation } with the analog model injected into the feedback path from the quantizer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH