www.gusucode.com > dsp 案例源码程序 matlab代码 > dsp/DesignaLowpassFilterwithTransitionBandExample.m
%% Design a Lowpass Filter with Transition Band % The following illustrates how to design a lowpass filter of order 225 % with transition band. %% % Create the frequency and amplitude vectors, |f| and |a|. f = [0 0.25 0.3 1] a = [1 1 0 0] %% % Use |firls| to obtain the |n+1| coefficients of the order |n| lowpass % FIR filter. b = firls(255,f,a); %% % Show the impulse response of the filter fvtool(b,'impulse')