How can i find the magnitude and phase spectrum of third order butterworth low pass filter?

Please help!

Answer 1

[Star Strider]

Please read the friendly documentation for the freqz and freqs functions!

[Group 1]

I did but its does not give the magnitude and phase spectra!

[Star Strider]

Yes it does!

[Group 1]

Ok, thank you, i will try to figure it out.

[Star Strider]

There is nothing to figure out for freqs. All you have to do is to give it the ‘b’ and ‘a’ vectors of your filter in that order, and either the number of frequency points you want it evaluated at (scalar) or a vector of radian frequencies.

[Group 1]

THANK YOU! i got it

[Star Strider]

My pleasure!

If my Answer solved your problem, please Accept it!

[Group 1]

Yes it did. Sure!

[Star Strider]

Thank you!