D. Joseph  Jeyakumar, J. Rajapaul  Perinbam, R. Rachel  Selina, 
    Low Power Digital Filter Implementation for Hearing Aid Applications,
    Research Journal of Applied Sciences,
    Volume 9,Issue 5,
    2014,
    Pages 274-282,
    ISSN 1815-932x,
    rjasci.2014.274.282,
    (https://makhillpublications.co/view-article.php?doi=rjasci.2014.274.282)
    Abstract: The design of any battery operated device is limited by power 
  consumption. The hearing aid prescription formula NAN-NL1 prescribes gain at 
  ANSI 1/3 octave frequencies. Most digital hearing aid designs avoid ANSI S1.11 
  compliant filter banks due to the high computational complexity involved. IIR 
  filter implementation of ANSI S1.11 design can be utilized only where linear 
  phase is not important. An FIR-based ANSI S1.11 filter bank is presented for 
  digital hearing aids which incorporates multi-rate algorithm to reduce data 
  rates on bandwidth limited bands. FIR filter order is minimized in a systematic 
  manner. Battery life longevity is preferred in electronic devices such as hearing 
  aids. This has been achieved by incorporating various low power techniques in 
  the design. Power reduction of about 30% is obtained when compared to the design 
  of hearing aids available in the literature.
    Keywords: Hearing aids;filter bank;FIR digital filters;non-uniform filter bank;ANSI S1.11 1/3 octave filter bank;multi-rate systems