scipy.signal.

symiirorder1

scipy.signal.symiirorder1(signal, c0, z1, precision=-1.0)

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.

Parameters:

signalndarray

The input signal. If 2D, then the filter will be applied in a batched fashion across the last axis.

c0, z1scalar

Parameters in the transfer function.

precision

Specifies the precision for calculating initial conditions of the recursive filter based on mirror-symmetric input.

Returns:

outputndarray

The filtered signal.