Apr 25, 2007 #1 C cydi Full Member level 3 Joined Dec 12, 2006 Messages 162 Helped 14 Reputation 28 Reaction score 3 Trophy points 1,298 Activity points 2,004 wn = [0.4 0.6]; b = fir1(10,wn); y = filter(b,1,signal to be filtered); Try this out....