Why is the scaling of high pass filters in FVTOOL not displaying the whole response?

yun-hun-jmai - 2021-03-22T15:31:27+00:00

Question: Why is the scaling of high pass filters in FVTOOL not displaying the whole response?

I perform the following code for a low pass filter and the response shown in FVTOOL displays a large range for the filter.     [a b] = butter(2, 0.01, 'low'); fvtool(a, b); However, when I use FVTOOL for a high pass filter, the range in the y-axis is much shorter. [a b] = butter(2, 0.1, 'high'); fvtool(a, b);

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Expert Answer

Neeta Dsouza answered . 2025-11-20

[a b] = butter(2, 0.1, 'high');

[h,w]=freqz(a,b);

h=10*log(abs(h));

w=w/max(w);

plot(w,h);

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