www.gusucode.com > dsp 案例源码程序 matlab代码 > dsp/NarrowbandLowpassDesignUsingAnInterpolationFactorOf6Example.m

    %% Narrowband lowpass design using an interpolation factor of 6
% This example shows how to use the function |ifir| to design a narrowband
% lowpass filter.

% Copyright 2015 The MathWorks, Inc.

[h,g]=ifir(6,'low',[.12 .14],[.01 .001]);
H = dfilt.dffir(h); G = dfilt.dffir(g);
hfv = fvtool(H,G);
legend(hfv,'Periodic Filter','Image Suppressor Filter');
Hcas = cascade(H,G);
hfv2 = fvtool(Hcas);
legend(hfv2,'Overall Filter');