IIR Filter Characteristics in LabVIEW

IIR filters in LabVIEW have the following characteristics:

• The IIR Filter VI interprets values at negative indexes in the following impulse equations as zero the first time you call the VI.

  x₀ = 1

  x_i = 0

  for all i ≠ 0.

• A transient response, or delay, proportional to the filter order occurs before the filter reaches a steady state.
• The number of elements in the filtered sequence equals the number of elements in the input sequence.
• The filter retains the internal filter state values when the filtering process finishes.