A gradient algorithm for center-frequency adaptive recursive bandpass filters

@article{RajaKumar1985AGA,
  title={A gradient algorithm for center-frequency adaptive recursive bandpass filters},
  author={R.V. Raja Kumar and Ranendra N. Pal},
  journal={Proceedings of the IEEE},
  year={1985},
  volume={73},
  pages={371-372}
}
Mean-square output of a center-frequency variable bandpass filter is employed as the performance criterion to make the filter self-adjusting to the center frequency of the input signal. A gradient ascending algorithm is proposed to update the center-frequency-dependent coefficients of the filter to maximize the performance function. 
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