1. A method for processing a multimedia signal, the method comprising:receiving a multimedia signal having a plurality of subbands;
receiving one or more proto-type filter coefficients for filtering the multimedia signal;
converting the proto-type filter coefficients into a set of subband filter coefficients for each subband;
individually truncating the set of subband filter coefficients for each subband based on a filter order obtained by at least partially using energy decay time information determined for each subband from the set of subband filter coefficients, wherein the filter order determines a truncation length of the set of subband filter coefficients, and the filter order is determined to be variable in a frequency domain according to the energy decay time information of each subband; and
filtering the multimedia signal by using the truncated set of subband filter coefficients corresponding to each subband signal.