my filter is defined by y(n)=x(n)+0.75x(n-1)+0.5x(n-2)+0.25x(n-3). This filter should have 256 points. IBased on this characteristic, is it a low pass filter?
I am trying to plot a magnitude/frequency graph but I get a bad plot.
clc;clear all;b0 = 0.25;b1 = [4 3 2 1];b = conv(b1,b0);[h,w]=freqz(b,256);plot(w/pi, 20*log10(abs(h)))ax = gca;ax.YLim = [-100 20];ax.XTick = 0:0.1:10;xlabel('Normalized Frequency')ylabel('Magnitude (dB)')
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