资料来源 : Free On-Line Dictionary of Computing

Infinite Impulse Response
     
         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)