{HEAD ~ PWM patterns} corresponding to {TAIL ~ substantially similar delta sigma modulator input signal levels} have substantially identical pulse widths 
corresponding to
{ HEAD ~ PWM patterns } corresponding to { TAIL ~ substantially similar delta sigma modulator input signal levels } have substantially identical pulse widths
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH