--- ./Lib/signal/filter_design.py.bad	2007-06-19 17:12:02.000000000 -0400
+++ ./Lib/signal/filter_design.py	2007-06-19 17:12:21.000000000 -0400
@@ -1539,4 +1539,4 @@
     alpha = N//2
     m = numpy.arange(0,N)
     h = win*special.sinc(cutoff*(m-alpha))
-    return h / sum(h,axis=0)
+    return h / numpy.sum(h,axis=0)