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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 : float 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 : float The maximum loss in the passband (dB). gstop : float The minimum attenuation in the stopband (dB). analog : int, optional Non-zero to design an analog filter (in this case wp and ws are in radians / second).
  Returns : | ord : int The lowest order for a Chebyshev type I filter that meets specs. wn : ndarray or float The Chebyshev natural frequency (the “3dB frequency”) for use with cheby1 to give filter results.

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