In general, traiisform aiicl snbband coders are designed so as to achieve perfect. reconst,ruction in the icky1 case. Nevert,heless. in a real system t,here are many clist,urbing effeck such as qnantization in digit,al filt,crs, intermediate coding st,ages, ancl noisy transinisslon channels which prevent. perfect, reconstmction. Usually, t,hese effert,s are &her iieglect8ed or modelled in a very simple ay. In contmst,, we present a new software tool which permits an aut.omatic symbolic analysis of irnplemented filter banks using refined models of wordlengt81i effec-t,s. FnrQhermore, we will validate the symbolic oiit,comes by measurement, results.IO. Rak J.R., A jS,bsiein For Trtrmjbriii J/>c:lur Coding o/' htrges, Third Irileriiatioirial Coifereiice on Sigiiiil Processiiig ICSP'96.