A system and method for limiting the output current of a fuel cell stack as the stack degrades overtime. The technique includes filtering the pressure data and the particle motion data with a plurality of directional filters to provide a plurality of filtered datasets. Finally, the continuous-time and continuous-value signal profile is determined on the basis of a mathematical reconstruction using the zero crossings {ti} and the phase values {\u03c6=ki\xb7\u03c02, ki\u03b5N0}, with a mathematical reconstruction algorithm using a function system {\u03c6}. Also, many specific ruleswarnings about reconfigurations need not be provided.