How do I get a magnitude respons with frequency at the x-axis?

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Joakim Hansen
Joakim Hansen 2017-10-19
评论： Star Strider 2017-10-20
When I use the function freqz() I'll get a response with normalized frequency at the x-axis. Is there a way to get the freqency instead or optionally calculate it by hand?

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Star Strider
Star Strider 2017-10-19
Yes!
Supply the sampling frequency (here ‘Fs’) as an argument to freqz to get the plot in terms of actual frequency (from 0 Hz to the Nyquist frequency), where ‘NFFT’ is the length of the Fourier transform you want to use (a good choice being 2^16):
freqz(sos, NFFT, Fs)
or:
freqz(b, a, NFFT, Fs)
or others, depending on how you implemented your filter.

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