example7_3.m

用dsp解压mp3程序的算法

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% Example7_3.m - Program for example 7-3
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% Design a Butterworth IIR filter

[nb,Wnb] = buttord(0.3,0.4,1,50);
[bb,ab]= butter(nb,Wnb);
fvtool(bb,ab);

% Design a elliptic IIR Filter

[ne,Wne] = ellipord(0.3,0.4,1,50);
[be,ae]= ellip(ne,1,50,Wne);
fvtool(be,ae);