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# scipy.signal.cheb1ord

`scipy.signal.``cheb1ord`(wp, ws, gpass, gstop, analog=0)

  Chebyshev type I filter order selection.

  Return the order of the lowest order digital Chebyshev Type I filter that loses no more than gpass dB in the passband and has at least gstop dB attenuation in the stopband.

  Parameters: | wp, ws – Passband and stopband edge frequencies, normalized from 0 : to 1 (1 corresponds to pi radians / sample). For example: Lowpass: wp = 0.2, ws = 0.3 Highpass: wp = 0.3, ws = 0.2 Bandpass: wp = [0.2, 0.5], ws = [0.1, 0.6] Bandstop: wp = [0.1, 0.6], ws = [0.2, 0.5] gpass – The maximum loss in the passband (dB). : gstop – The minimum attenuation in the stopband (dB). : analog – Non-zero to design an analog filter (in this case wp and : ws are in radians / second).
  Returns: | ord – The lowest order for a Chebyshev type I filter that meets specs. : Wn – The Chebyshev natural frequency (the “3dB frequency”) for : use with scipy.signal.cheby1 to give filter results.

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