# How do ı convert rad/sample to Hz?

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studentmatlaber on 26 May 2021
Commented: Star Strider on 27 May 2021
Hello to everyone. I passed the signal through the Parks-McClellan optimal FIR filter. With the fvtool command, I get the magnitude response in rad / sample. but what I want is a filter response graph in Hertz. Is there a command that can directly plot the graph in Hertz? Or how do I convert rad / sample to Herzt.
[n, fo, ao, w] = firpmord ([0.04 1], [1 0], [0.001 0.01], Fs);
b = firpm (n, fo, ao, w);
fvtool(b,1);
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Star Strider on 27 May 2021
As always, my pleasure!

Star Strider on 26 May 2021
Note that π radians/sample is equivalent to the Nyquist frequency, one-half of the sampling frequency.
In fvtool, click on the x-axis label to change it from rad/sample to Hz automatically. Another option is to use the freqz function instead, and specify ‘Fs’ as the last argument:
Fs = 10; % Define ®Fs'
[n, fo, ao, w] = firpmord ([0.04 1], [1 0], [0.001 0.01], Fs);
b = firpm (n, fo, ao, w);
figure
freqz(b, 1, 2^16, Fs)
.

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