A signal processing device having a plurality of processing stages, each of the plurality of processing stages being adapted for applying an input signal to each of at least one item under examination to be coupled to a respective one of the plurality of processing stages, and at least one signal reconditioning unit, each of the at least one signal reconditioning unit being adapted for reconditioning the input signal in a signal path between a preceding one of the plurality of processing stages and a subsequent one of the plurality of processing stages.