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

    %% Design an FIR Decimator
% To design an FIR Decimator using the |designMultirateFIR| function, you
% must specify the decimation factor of interest (usually greater than 1)
% and an interpolation factor equal to 1.
% You can use the default half-polyphase length of 12 and the default
% stopband attenuation of 80 dB. Alternately, you can also specify the
% half-polyphase length and stopband attenuation values.
% Design an FIR decimator with decimation factor set to 3, and
% half-polyphase length set to 14. Use the default stopband attenuation
% of 80 dB.
b = designMultirateFIR(1,3,14);
fvtool(b,'impulse');