scipy.signal.cheb1ord¶
- scipy.signal.cheb1ord(wp, ws, gpass, gstop, analog=0)[source]¶
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.
