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# scipy.signal.symiirorder1

`scipy.signal.``symiirorder1`()

  symiirorder1(input, c0, z1 {, precision}) -> output

  Description:

  > 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.

  Inputs:

  > input – the input signal. c0, z1 – parameters in the transfer function. precision – specifies the precision for calculating initial conditions

  > > of the recursive filter based on mirror-symmetric input.

  Output:

  > output – filtered signal.

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