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