diff --git a/libs/util/include/psemek/util/fixed_point.hpp b/libs/util/include/psemek/util/fixed_point.hpp
index 472ec7d7..b632135f 100644
--- a/libs/util/include/psemek/util/fixed_point.hpp
+++ b/libs/util/include/psemek/util/fixed_point.hpp
@@ -363,6 +363,25 @@ namespace psemek::util
 		return FP::from_rep(((x.rep() - static_cast<rep_type>(1)) & ~fractional_mask) + fixed_point_one);
 	}
 
+	template <unsigned int I, unsigned int F, bool S>
+	constexpr fixed_point<I, F, S> trunc(fixed_point<I, F, S> x)
+	{
+		if (S && x < fixed_point<I, F, S>{0})
+		{
+			return ceil(x);
+		}
+		else
+		{
+			return floor(x);
+		}
+	}
+
+	template <unsigned int I, unsigned int F, bool S>
+	constexpr fixed_point<I, F, S> fract(fixed_point<I, F, S> x)
+	{
+		return x - trunc(x);
+	}
+
 	template <unsigned int I, unsigned int F, bool S>
 	constexpr fixed_point<I, F, S> round(fixed_point<I, F, S> x)
 	{