scipy.signal.
symiirorder2#
- scipy.signal.symiirorder2(input, r, omega, precision=-1.0)[source]#
- Implement a smoothing IIR filter with mirror-symmetric boundary conditions using a cascade of second-order sections. - The second section uses a reversed sequence. This implements the following transfer function: - cs^2 H(z) = --------------------------------------- (1 - a2/z - a3/z^2) (1 - a2 z - a3 z^2 ) - where: - a2 = 2 * r * cos(omega) a3 = - r ** 2 cs = 1 - 2 * r * cos(omega) + r ** 2 - Parameters:
- inputndarray
- The input signal. 
- r, omegafloat
- Parameters in the transfer function. 
- precisionfloat
- Specifies the precision for calculating initial conditions of the recursive filter based on mirror-symmetric input. 
 
- Returns:
- outputndarray
- The filtered signal.