Speech　enhancement　technology　can　extract　the　speech　signal　in　noise　environment　and　enhance　the　recognition　rate.　In　this　paper,　we　first　develop　two　embedded　hearing　aid　systems　with　noise　reduction,　respectively　using　Kalman　filter　and　Wiener　filter　techniques.　Next,　we　give　a　comparative　study　on　the　two　speech　enhancement-based　hearing　aid　systems　by　testing　subjective　auditory　in　noise　environment.　The　comparative　result　shows　that　the　hearing　aid　system　based　on　the　Kalman　filter-based　speech　enhancement　can　increase　the　rate　of　speech　recognition　and　the　hearing　comfort　of　hearing　impaired　persons　in　a　noisy　environment,　compared　with　the　hearing　aid　system　based　on　the　Wiener　filter-based　speech　enhancement.　©　2015　IEEE.