Implement a smoothing IIR filter with mirror-symmetric boundary conditions using a cascade of first-order sections. The second section uses a reversed sequence. This implements a system with the following transfer function and mirror-symmetric boundary conditions:
c0 H(z) = --------------------- (1-z1/z) (1 - z1 z)
The resulting signal will have mirror symmetric boundary conditions as well.
The input signal.
- c0, z1scalar
Parameters in the transfer function.
- precision :
Specifies the precision for calculating initial conditions of the recursive filter based on mirror-symmetric input.
The filtered signal.