Scaling of fractional delay filters based on the Farrow structure

@article{Khan2009ScalingOF,
  title={Scaling of fractional delay filters based on the Farrow structure},
  author={Tahir Abbas Khan and Oscar Gustafsson and H{\aa}kan Johansson},
  journal={2009 IEEE International Symposium on Circuits and Systems},
  year={2009},
  pages={489-492}
}
In this work we consider scaling of fractional delay filters using the Farrow structure. Based on the observation that the subfilters approximate the Taylor expansion of a differentiator, we derive estimates of the L2-norm scaling values at the outputs of each subfilter as well as at the inputs of each delay multiplier. The scaling values can then be used to derive suitable wordlengths in a fixed-point implementation. 

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