RA_FP_MUL
g->measured = RA_FP_MUL(RA_FP_1 - sfer, rate);
g->average = RA_FP_MUL(RA_FP_1 - alpha, g->average);
g->average += RA_FP_MUL(alpha, g->measured);
g->stddeviation = RA_FP_MUL(RA_FP_1 - beta, g->stddeviation);
g->stddeviation += RA_FP_MUL(beta, delta);
g->measured = RA_FP_MUL(RA_FP_1 - sfer, rate);
g->average = RA_FP_MUL(RA_FP_1 - alpha, g->average);
g->average += RA_FP_MUL(alpha, g->measured);
g->stddeviation = RA_FP_MUL(RA_FP_1 - beta, g->stddeviation);
g->stddeviation += RA_FP_MUL(beta, delta);