{HEAD ~ A scaling device} amplifies {TAIL ~ the radiant energy signal levels} of the input array and the digital array so that the radiant energy signal level carried by the digital array corresponds to the threshold level 
amplifies
{ HEAD ~ A scaling device } amplifies { TAIL ~ the radiant energy signal levels } of the input array and the digital array so that the radiant energy signal level carried by the digital array corresponds to the threshold level
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