A system and method for the resynchronization of a sequential decoder that decodes received signal samples stored within an input buffer is disclosed. They can be used as disinfectants for foodstuffs, cosmetics, medicaments or other nutrient-containing materials, or as medicaments to treat or prevent infections. The interrupting may be interactively commenced by the viewer, or the interrupt may be automatically commenced by the system. The arithmetic method determines portfolio performance over multiple time periods as a sum of terms of form, where the coefficients \u03b1t are defined as\u03b11=R-R_-A\u2062\u2211k=1T\u2062\u2211k=1T\u20622\u2062.