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Asymptotic equivalence of some adaptive biquad notch filters

  • Recent Results In Signal Processing And Communications
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Abstract

A diverse choice of biquad designs is available for adaptive notch filtering or line enhancement (ANF/ALE) applications. We consider one such biquad proposed over a decade ago by David and coworkers and show its equivalence to two other formulations in terms of their pole-zero pair locations in thez-plane. By equivalence, we imply that all these adaptive IIR filters possess comparable asymptotic performance. Further, a simple modification, involving only a normalizing factor, is seen to enhance the performance of this filter. This modified ANF/ALE design is then shown to be equivalent to two other recently proposed adaptive biquads.

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Authors and Affiliations

  1. Signion Systems Pvt. Ltd., 6-3-569/1/2, Rockdale Compound, Somajiguda, 500 082, Hyderabad, India

    C G Hiremath

  2. ZSP Corporations, 2855, Kifer Road, Suite 200, 95051, Santa Clara, CA, USA

    V V Krishna

Authors
  1. V V Krishna
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  2. C G Hiremath
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Krishna, V.V., Hiremath, C.G. Asymptotic equivalence of some adaptive biquad notch filters. Sadhana 23, 73–82 (1998). https://doi.org/10.1007/BF02747624

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