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