Authors : D. Joseph Jeyakumar, J. Rajapaul Perinbam and R. Rachel Selina
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.
D. Joseph Jeyakumar, J. Rajapaul Perinbam and R. Rachel Selina, 2014. Low Power Digital Filter Implementation for Hearing Aid Applications. Research Journal of Applied Sciences, 9: 274-282.