The objective of the invention is to solve the problems of conventional polymer electrolyte membranes, including small ion-exchange capacity and low oxidation and methanol resistance. By way of example, the signal processing method includes a selection unit configured to select, based on a first comparison of an analog signal with a determination voltage, a selected reference voltage to be compared with the analog signal, the selected reference voltage being selected from a plurality of reference voltages. At each core, a single configurable compressor and a single configurable decompressor can be configured to compress and to decompress integer or floating-point waveform data.