As an example: v_outn = (v_in_1*c-1) + (v_in_0*c0) + (v_in_-1*c1) This is an FIR filter with v_in_1 coming in first and multiplied by c-1 (this is c subscript -1), delayed 1UI (v_in_0) and multiplied by c0, delayed another UI (v_in_-1) and multiplied by the coefficient c1 How do I create a touchstone file that represents this filter? Assume I know the coefficient values ahead of time (and also what if I don't?). ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu