--- a/frames/frame.m
+++ b/frames/frame.m
@@ -268,7 +268,7 @@
     F.length=@(Ls) filterbanklength(Ls,F.a);
     F.lengthcoef=@(Ncoef) round(Ncoef/F.red);
     F.native2coef=@(coef) cell2mat(coef(:));
-    F.coef2native=@(coef,s) mat2cell(coef,s(1)*F.a(:,2)./F.a(:,1));
+    F.coef2native=@(coef,s) mat2cell(coef,s(1)/F.red*F.a(:,2)./F.a(:,1));
     F.frana=@(insig) framenative2coef(F,comp_filterbank(insig,F.g,F.a));
     F.frsyn=@(insig) ifilterbank(F.coef2native(insig,size(insig)),F.g,F.a);