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access icon openaccess 18 band ANSI S1.11 filter bank based on interpolated finite impulse response technique for hearing aids

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 25/07/2019, Accepted 23/03/2020, Published 30/04/2020

A low complexity interpolated finite impulse response (IFIR) based 18 band ANSI S1.11 1/3 octave digital filter bank for hearing aid is proposed and implemented using 65 nm UMC technology in this study. ANSI S1.11 specifications for 1/3 octave Class-2 filters are chosen as design criteria in the proposed method. The strict requirements at lower bands make the hardware implementation of ANSI S1.11 filter bank complex and difficult in a power critical application like hearing aid. In the proposed technique, the maximum margin available in the filter specifications is utilised in both upper and lower band edge specifications to reduce the filter order. IFIR technique was used to reduce the computations at lower bands which can be implemented in hardware efficiently without altering the sampling frequency of the input signal. Compared to other recent architectures, >50% reduction in total number of filter coefficients is achieved and the group delay is kept <10 ms. Hardware implementation of the algorithm was done using 65 nm standard cell libraries and tested the outputs with NAL-NL2 gain prescriptions. The matching errors are within and the core power consumption was obtained as 0.37 mW.

Inspec keywords: channel bank filters; interpolation; medical signal processing; FIR filters; hearing aids

Other keywords: nonlinear prescription formulas; standard cell library; UMC technology; interpolated finite impulse response technique; upper band edge specifications; matching errors; insertion gains; filter coefficients; filter order; ANSI S1.11 filter bank complex; filter specifications; size 65.0 nm; core power consumption; filter bank architecture; 1-3 octave class-2 filters; power 0.37 mW; hardware implementation; sampling frequency; hearing aid; 18 band ANSI S1.11 1-3 octave digital filter bank; input signal; lower band edge specifications; audiogram

Subjects: Digital signal processing; Prosthetics and orthotics; Auditory prostheses and hearing aids; Biology and medical computing; Biomedical measurement and imaging; Filtering methods in signal processing

References

    1. 1)
      • 12. Yang, C.Y., Liu, C.W., Jou, S.J.: ‘A systematic ANSI S1.11 filter bank specification relaxation and its efficient multirate architecture for hearing aid systems’, IEEE/ACM Trans. Audio Speech Lang. Process., 2016, 24, (8), pp. 1380–1392.
    2. 2)
      • 27. ‘Mems microphones, the future for hearing aids’. Available at https://www.analog.com/en/analog-dialogue/articles/mems-microphones-future-for-hearing-aids.html.
    3. 3)
      • 21. Kaiser, J.F.: ‘Nonrecursive digital filter design using the i-sinh window function’. Proc. 1974 IEEE Int. Symp. on Circuits & Systems, San Francisco DA, April 1974, pp. 20–23.
    4. 4)
      • 10. Kuo, Y.T., Lin, T.J., Li, Y.T., et al: ‘Design and implementation of low power ANSI S1.11 filter bank for digital hearing aids’, IEEE Trans. Circuits Syst. I, Regul. Pap., 2010, 57, (7), pp. 1684–1696.
    5. 5)
      • 28. ‘Guidelines for hearing aids and services for developing countries’. World Health Organisation, 2004.
    6. 6)
      • 20. ‘Specifications for octave and fractional-octave-band analog and digital filters’. ANSI, 2004. S1.11.
    7. 7)
      • 1. World Health Organisation: ‘Deafness and hearing loss’, 15 March 2018. accessed 19 February 2019. https://www.who.int/news-room/fact-sheets/detail/deafness-and-hearing-loss.
    8. 8)
      • 4. McAllister, H., Black, N., Waterman, N., et al: ‘Audiogram matching using frequency sampling filters’. Engineering in Medicine and Biology Society, 1994. Engineering Advances: New Opportunities for Biomedical Engineers. Proc. 16th Annual Int. Conf. of the IEEE, Baltimore, MD, USA, 1994, vol. 1, pp. 249–250.
    9. 9)
      • 23. Lai, S.C., Liu, C.H., Wang, L.Y., et al: ‘14-ms group delay and low complexity algorithm design of 18 band quasi-ANSI S1.11 1/3 octave filter bank for digital hearing aids’. 2014 Tenth Int. Conf. on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP), Kitakyushu, Japan, 2014, pp. 81–84.
    10. 10)
    11. 11)
      • 9. Lai, S.C., Liu, C.H., Wang, L.Y., et al: ‘11.25-ms group delay and low complexity algorithm design of 18-band quasi-ANSI S1.11 1/3 octave digital filter bank for hearing aids’, IEEE Trans. Circuits Syst. I, Regul. Pap., 2015, 62, (6), pp. 1572–1581.
    12. 12)
      • 13. Deng, T.B.: ‘Three-channel variable filter-bank for digital hearing aids’, IET Signal Process., 2010, 4, (2), pp. 181–196.
    13. 13)
      • 14. Yund, E.W., Buckles, K.M.: ‘Multichannel compression hearing aids: effect of number of channels on speech discrimination in noise’, J. Acoust. Soc. Am., 1995, 97, (2), pp. 1206–1223.
    14. 14)
      • 18. Keidser, G., Dillon, H., Flax, M., et al: ‘The NAL-NL2 prescription procedure’, Audiol. Res., 2011, 1, (1), pp. 88–90.
    15. 15)
      • 17. Byrne, D., Dillon, H., Ching, T., et al: ‘NAL-NL1 procedure for fitting nonlinear hearing aids: characteristics and comparisons with other procedures’, J. Am. Acad. Audiol., 2001, 12, (1), pp. 37–51.
    16. 16)
      • 11. Liu, C.W., Chang, K.C., Chuang, M.H., et al: ‘10-ms 18 band quasi-ANSI S1.11 1/3 octave filter bank for digital hearing aids’, IEEE Trans. Circuits Syst. I, Regul. Pap., 2013, 60, (3), pp. 638–649.
    17. 17)
      • 22. Vaidyanathan, P.P.: ‘Multirate systems and filter banks’ (Pearson Education India, India, 1993).
    18. 18)
      • 5. Brennan, R., Schneider, T.: ‘A flexible filterbank structure for extensive signal manipulations in digital hearing aids’. Proc. 1998 IEEE Int. Symp. on Circuits and Systems, 1998. ISCAS'98, Monterey, CA, USA, 1998, vol. 6, pp. 569–572.
    19. 19)
      • 26. ‘Aic111: 1.3-v micro power single channel codec’. Available at http://www.ti.com/product/AIC111/description.
    20. 20)
      • 25. Deepu, S.P., Sumam, D.S., Ramesh, K.M.: ‘Estimation of attack time constant for dynamic range compressors in hearing aids’. 2016 IEEE Int. Conf. on Digital Signal Processing (DSP), Beijing, People's Republic of China2016, pp. 20–24.
    21. 21)
      • 24. ‘How to read your hearing test’. Available at http://www.earinfo.com/how-to-read-a-hearing-aid-test/common-audiograms.
    22. 22)
      • 19. Scollie, S., Seewald, R., Cornelisse, L., et al: ‘The desired sensation level multistage input/output algorithm’, Trends Amplif., 2005, 9, (4), pp. 159–197.
    23. 23)
      • 8. Wei, Y., Ma, T., Ho, B.K., et al: ‘The design of low-power 16-band nonuniform filter bank for hearing aids’, IEEE Trans. Biomed. Circuits Syst., 2019, 13, (1), pp. 112–123.
    24. 24)
      • 16. Wei, C.W., Tsai, C.C., FanJiang, Y., et al: ‘Analysis and implementation of low-power perceptual multiband noise reduction for the hearing aids application’, IET Circuits Devices Syst., 2014, 8, (6), pp. 516–525.
    25. 25)
      • 3. Nielsen, L.S., Sparso, J.: ‘Designing asynchronous circuits for low power: an IFIR filter bank for a digital hearing aid’, Proc. IEEE, 1999, 87, (2), pp. 268–281.
    26. 26)
      • 7. Lian, Y., Wei, Y.: ‘A computationally efficient nonuniform FIR digital filter bank for hearing aids’, IEEE Trans. Circuits Syst. I, Regul. Pap., 2005, 52, (12), pp. 2754–2762.
    27. 27)
      • 15. Loizou, P.C.: ‘Speech enhancement: theory and practice’ (CRC press, Florida, USA, 2007).
    28. 28)
      • 2. Lunner, T., Hellgren, J.: ‘A digital filterbank hearing aid-design, implementation and evaluation’. 1991 Int. Conf. on Acoustics, Speech, and Signal Processing, 1991. ICASSP-91, Toronto, Ontario, Canada, 1991, pp. 3661–3664.
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