{HEAD ~ The undesired periodic noise} is coupled via ground and {TAIL ~ the battery} into the signal processing path 
is coupled via
{ HEAD ~ The undesired periodic noise } is coupled via ground and { TAIL ~ the battery } into the signal processing path
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH