Ok figured it out. Page 268 of DSP by Paulo Diniz gives s transformations to go from a normalized LPF to HPF and BPF. -- View this message in context: http://mailinglists.scilab.org/Linear-Filter-analpf-transform-to-hpf-or-bpf-tp4024626p4024631.html Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com.