Although　the　electrolarynx　(EL)　provides　an　important　means　of　voice　reconstruction　for　patients　who　lose　their　vocal　cords　by　laryngectomies,　the　radiated　noise　and　additive　environment　noise　reduce　the　intelligibility　of　the　resulting　EL　speech.　This　paper　proposes　an　improved　spectrum　subtract　algorithm　by　taking　into　account　the　nonuniform　effect　of　colored　noise　on　the　spectrum　of　EL　speech.　Since　the　over-subtraction　factor　of　each　frequency　band　can　be　adjusted　in　the　enhancement　process,　a　better　noise　reduction　effect　was　obtained　and　the　perceptually　annoying　musical　noise　was　efficiently　reduced,　as　compared　to　other　standard　speech　enhancement　algorithms.　©　2009　by　the　authors.