How can I find the omega C value in butterworth filter?

My question: I have two values; Ws = 0.2*pi, Wp = 0.3*pi, I will create a butterworth filter but how can I find the omega C value ?

[Star Strider]

What do you mean by ‘omega C’? What sort of filter are you designing? My guess is that ‘omega C’ is the centre frequency of a bandpass or bandstop filter, but that isn’t the design (lowpass) you imply in your Question.

[Yosi Nifusi]

Omega C means; Ωc = cut off frequency

[Star Strider]

In the buttord documentation, ‘Wp’ the passband corner frequency, is described as the cutoff frequency. That is what U find confusing. Do you mean the half-power frequency (-6 dB)? If so, you can use the find function to find the approximate frequency at which the amplitude is half the peak.

[Yosi Nifusi]

Thanks a lot, I solved my problem

[Star Strider]

My pleasure.

I should have posted it as an Answer!