Digital notch filter with time-varying quality factor for the reduction of powerline interference

@article{Piskorowski2010DigitalNF,
  title={Digital notch filter with time-varying quality factor for the reduction of powerline interference},
  author={Jacek Piskorowski},
  journal={Proceedings of 2010 IEEE International Symposium on Circuits and Systems},
  year={2010},
  pages={2706-2709}
}
Many applications require notch filters which possess both a very selective magnitude response (i.e. high quality factor Q) and a transient response of short duration. However, increasing the quality factor also increases the duration of the transient process in the filter after the action of the excitation. This paper presents a concept of digital IIR notch filters whose quality factor changes with time. Owing to a temporary change in the value of the quality factor, the transient can be… CONTINUE READING
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