The analog to digital converter 44, of course, only samples the analog input from the light sensor 26 at discrete intervals as {HEAD ~ the stationary light sensor} 26 scans {TAIL ~ the path} 22 of the moving media 12 
scans
The analog to digital converter 44 , of course , only samples the analog input from the light sensor 26 at discrete intervals as { HEAD ~ the stationary light sensor } 26 scans { TAIL ~ the path } 22 of the moving media 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH