The data reproducing device 12, wherein said filter circuit comprises at least a switching member for passing electric currents corresponding to said predetermined component, and wherein said conversion circuit comprises a comparator {HEAD ~ whose input terminals} are arranged to receive {TAIL ~ voltage values} representative of the predetermined component, and a predetermined reference voltage value 
are arranged to receive
The data reproducing device 12 , wherein said filter circuit comprises at least a switching member for passing electric currents corresponding to said predetermined component , and wherein said conversion circuit comprises a comparator { HEAD ~ whose input terminals } are arranged to receive { TAIL ~ voltage values } representative of the predetermined component , and a predetermined reference voltage value
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