fir.m

来自「基于tms320vc55*系列DSP常用算法」· M 代码 · 共 23 行

%
% FIR filter design using Hamming window
%
ORD1=511;
F=8000;
N=128;
x=(0:127)/256*F;

% Nth order Lowpass
f1=1200;
Wn=f1/F*2;
blp=fir1(ORD1,Wn);
BLP=blp*32767;
m=freqz(blp,1,N);
plot(x,28*log10(abs(m)));
grid;
pause
clf
fid=fopen('d:\dspbk\web\exp\exp7\firlp512c.dat', 'w');
fprintf(fid, '%5.0f,\n', BLP);
fclose(fid);