How do ı convert rad/sample to Hz?

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);

[studentmatlaber]

thank you so much

[Star Strider]

As always, my pleasure!

Answer 1

[Star Strider]

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)

.