Optionally, difference signal E 246 is processed by digital filter 254, such as {HEAD ~ an infinite impulse response filter}, to amplify, smooth, or otherwise manipulate difference signal E 246 to produce {TAIL ~ control signal} 256 for adjusting the waveform shape in accordance with the method described in Blankenship U.S 
Optionally , difference signal E 246 is processed by digital filter 254 , such as { HEAD ~ an infinite impulse response filter } , to amplify , smooth , or otherwise manipulate difference signal E 246 to produce { TAIL ~ control signal } 256 for adjusting the waveform shape in accordance with the method described in Blankenship U.S
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH