scipy.signal.symiirorder2¶
- scipy.signal.symiirorder2(input, r, omega, precision=- 1.0)¶
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.