DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Infinite Impulse Response
   IIR
      <electronics, DSP> A type of digital signal filter, in
      which every sample of output is the weighted sum of past and
      current samples of input, using all past samples, but the
      weights of past samples are an inverse function of the sample
      age, approaching zero for old samples.
      (2001-06-06)