1. An asynchronous pulse processing (APP) apparatus comprising: an apparatus gain block configured to scale an input signal by a first scale value to produce a scaled input signal, the input signal being one of a plurality of input signals; an apparatus summation block configured to produce a composite signal by subtracting from the scaled input signal each of a normalized signal scaled by a second scale value and the normalized signal multiplied by a first summation signal; an apparatus integrator configured to integrate the composite signal and produce an integrated signal; and an apparatus time encoder configured to time-encode the integrated signal and produce the normalized signal, wherein the first summation signal represents a summation of the plurality of input signals.