Delay Efficient Cosine Modulated Reconfigurable Filter Bank for Digital Hearing Aids targeting Noise Induced Hearing Loss



In this paper, an efficient architecture for cosine modulated reconfigurable filter bank with sectional reconfigurability is proposed for Digital Hearing Aids targeting Noise Induced Hearing Loss. Polyphase implementation of the prototype filter with shared modulation coefficients reduces the computational complexity and increases the tuning flexibility. The proposed architecture can be used for frequency compensation of different classes of audiograms while keeping the group delay minimum. The proposed filter bank can provide 1296 different frequency band distribution schemes based on external control signals according to the nature of the audiogram. The architecture is based on a 16-band cosine modulated filter bank with dynamic mering of bands based on audiogram. The flexibility of the filter bank allows matching most of the audiograms including low or moderately sloping SNHL and NIHL with notch at the center of frequency range. For all the standard audiograms considered for evaluation, the proposed design has acceptable matching errors. The group delay is very less compared to existing reconfigurable filter banks, which provide room for accommodating other DSP algorithms in sophisticated Digital Hearing Aids. The hardware resources required for implementation are comparable with other reconfigurable filter banks designed for the same application.


Filter bank, Cosine Modulated Filter Bank, Digital Hearing Aid, Delay Efficient Architecture

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World Health Organization, World report on hear-ing, Geneva:2021, Licence: CC BY-NC-SA 3.0 IGOW.

Jos J. Eggermont, Chapter 2 - Epidemiology, Etiolo-gy and Genetics of Hearing Problems, Noise and the Brain, Academic Press, 2014, Pages 24-48.

Panza F, Solfrizzi V, Seripa D, Imbimbo BP, Capozzo R, Quaranta N, Pilotto A and Logroscino G, Age-related hearing impairment and frailty in Alzhei-mer's disease: interconnected associations and mechanisms. Front. Aging Neurosci. 2015 7:113.

Mohammadizadeh M, Ahmadi SH, Sekhavati E, Ahani-Jegar K. Noise pollution effect in flour facto-ry on workers' hearing in Lamerd City. J Med Life. 2015;8 (Spec Iss 3):208-211.

Dehankar SS, Gaurkar SS. Impact on Hearing Due to Prolonged Use of Audio Devices: A Literature Re-view. Cureus. 2022 Nov 12;14(11):e31425.

Salmon MK, Brant J, Hohman MH, et al. Audiogram Interpretation. [Updated 2023 Mar [1]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from:

Agarwal G, Nagpure PS, Pal KS, Kaushal AK, Kumar M. Audiometric notching at 4 kHz: Good screening test for assessment of early onset of occupational hearing loss. Indian J Otol 2015;21:270-3

Earinfo 1996, Commonly used Auiograms. Earinfo.Com.

Kim, Sang‐Won & Kim, Minjoon & Kim, Jae‐Seok. (2019). High-Performance DSP Platform for Digital Hearing Aid SoC with Flexible Noise Estimation. IET Circuits, Devices & Systems. 13.

Sajan P Philip, Sampath Palaniswami & Harikirubha Sivakumar 2020, ‘A Computationally Efficient 11 Band Non-Uniform Filter Bank for Hearing Aids Targeting Moderately Sloping Sensorineural Hear-ing Loss’, Informacije MIDEM - Journal of Microe-lectronics, Electronic Components and Materials, vol. 50, no. 3, pp. 153-167.

Yong Lian & Ying Wei 2005, ‘A computationally efficient nonuniform FIR digital filter bank for hear-ing aids’, IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 52, no. 12, pp. 2754-2762.

Agnew J. The causes and effects of distortion and internal noise in hearing AIDS. Trends Amplif. 1998 Sep;3(3):82-118.

Lee, Jeongjin & Lee, Byeong. (1995). A design of nonuniform cosine modulated filter banks. Circuits and Systems II: Analog and Digital Signal Pro-cessing, IEEE Transactions on. 42. 732 - 737.

Woods, WS, Van Tasell, DJ, Rickert, ME & Trine, TD 2006, SII and fit-to-target analysis of compression system performance as a function of number of compression channels, International Journal of Au-diology, vol. 45, no. 11, pp. 630-644.

J. Agnew and J. M. Thornton, “Just Noticeable and Objectionable Group Delays in Digital Hearing Aids,” Journal of the American Academy of Audiology, vol. 11, no. 06. Georg Thieme Verlag KG, pp. 330–336, Jun-2000.

Yuan-Pei Lin and P. P. Vaidyanathan, "Application of DFT filter banks and cosine modulated filter banks in filtering," Proceedings of APCCAS'94 - 1994 Asia Pacific Conference on Circuits and Systems, Taipei, Taiwan, 1994, pp. 254-259

Kalathil, S & Elias, E 2015, ‘Efficient design of non-uniform cosine modulated filter banks for digital hearing aids’, AEU - International Journal of Electronics and Communications, vol. 69, no. 9, pp. 1314-1320.

Huang, S, Tian, L, Ma, X & Wei, Y 2016, A Reconfigurable Sound Wave Decomposition Filterbank for Hearing Aids Based on Nonlinear Transformation, IEEE Transactions on Biomedical Circuits and Systems, vol. 10, no. 2, pp. 487-496.

Kumar, A, Sunkaria, RK & Dev Sharma, L 2018, Design of Cosine Modulated Non-uniform filter bank using Particle Swarm Optimization, 2018 5th International Conference on Signal Processing and Integrated Networks (SPIN), pp. 614-618.

Vellaisamy, S & Elias, E 2018, Design of hardware-efficient digital hearing aids using non-uniform MDFvaT filter banks, Signal, Image and Video Processing, vol. 12, no. 8, pp. 1429-1436.

Vaidyanathan, P 1987, Quadrature mirror filter banks, M-band extensions and perfect-reconstruction techniques, IEEE ASSP Magazine, vol. 4, no. 3, pp. 4-20.

Koilpillai, RD & Vaidyanathan, PP 1992, Cosine-modulated FIR filter banks satisfying perfect reconstruction, IEEE Transactions on Signal Processing, vol. 40, no.4, pp. 770-783.

Xiqi Gao, Zhenya He & Xiang-Gen Xin 1999, Efficient implementation of arbitrary-length cosine-modulated filter bank, IEEE Transactions on Signal Processing, vol. 47, no. 4, pp. 1188-1192.

Bregovic, R, Yu, YJ, Viholainen, A & Lim, YC 2010, Implementation of Linear-Phase FIR Nearly Perfect Reconstruction Cosine-Modulated Filterbanks Utilizing the Coefficient Symmetry, IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 57, no. 1, pp. 139-151.

Ogale, J & Ashok, S 2011, Cosine Modulated Non-Uniform Filter Banks’, Journal of Signal and Information Processing, vol. 02, no.03, pp. 10-19.

Zijing, Z & Yun, Y 2007, A simple design method for nonuniform cosine modulated filter banks, IEEE 2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE, pp. 1052-1055.

Princen, J 1995, The design of nonuniform modulated filterbanks, IEEE Transactions on Signal Processing, vol. 43, no. 11, pp. 2550-2560.

Lee, SJ, Kim, S & Yoo, HJ 2007, A Low Power Digital Signal Processor with Adaptive Band Activation for Digital Hearing Aid Chip, 2007 IEEE International Symposium on Circuits and Systems, pp. 2730-2733.

Wei, Y & Wang, Y 2015, Design of Low Complexity Adjustable Filter Bank for Personalized Hearing Aid Solutions, IEEE/ACM Transactions on Audio, Speech, and Language Processing, vol. 23, no. 5, pp. 923-931.

Amir, A, TS, B & Elias, E 2018, Design and implementation of reconfigurable filter bank structure for low complexity hearing aids using 2-level sound wave decomposition, Biomedical Signal Processing and Control, vol. 43, no. 12, pp. 96-109.

Wei, Y, Ma, T, Ho, B K & Lian, Y 2019, The Design of Low-Power 16-Band Nonuniform Filter Bank for Hearing Aids, IEEE Transactions on Biomedical Circuits and Systems, vol. 13, no. 1, pp.112-123.

Haridas, N & Elias, E 2016a, Efficient variable bandwidth filters for digital hearing aid using Farrow structure, Journal of Advanced Research, vol. 7, no. 2, pp 255-262.

Haridas, N & Elias, E 2016b, Design of reconfigurable low-complexity digital hearing aid using Farrow structure based variable bandwidth filters, Journal of Applied Research and Technology, vol. 14, no. 2, pp. 154-165.


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