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