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Efficient low delay reconfigurable filter bank using parallel structure for hearing aid applications with IoT

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Abstract

Reconfigurable filter banks are mostly used in hearing aid applications to divide the input audio signal into bands and subbands. In this paper, we are proposing to implement a new reconfigurable filter bank using a parallel structure to reduce the delay. In the existing method of the reconfigurable filter bank, band division is performed one after another by sharing the resources. Instead, the proposed parallel structure reduces the overall delay in the filter bank by performing reconfigurability in parallel for each subband. The FIR filters in the proposed structure are implemented using the Taylor window, which gives better attenuation with the lower order. The implemented structure is tested with five audiograms having mild hearing loss at low frequency, mild hearing loss at middle frequency, moderate hearing loss at high frequency, mild hearing loss at high frequency, and mild conductive hearing loss. From the results, it is clear that the proposed structure performs better in terms of delay except for two cases. However, the delay is less than 10 ms for that two cases and the matching error is improved. Delay is reduced with a minute increase in matching error that to in two cases, audiogram with mild hearing loss at high frequency and mild conductive hearing loss. The proposed filter bank structure can satisfy different requirements of hearing loss cases with acceptable delay. In the proposed hearing aid, Internet of Things is used to select the number of subbands in each band and to communicate the gain values to the hearing aid through a mobile application.

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Funding

The research leading to these results received funding from Science for Equity, Empowerment and Development Division under Technology Interventions for Disabled and Elderly (TIDE), Department of Science and Technology, Government of India under Grant Agreement No. SEED/TIDE/015/2017/G.

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Authors and Affiliations

  1. School of Electronics Engineering, Vellore Institute of Technology, 632014, Vellore, Tamilnadu, India

    K. Ayyappa Swamy & Zachariah C. Alex

  2. Bio Signal Research Lab, Department of EIE, Sree Vidyanikethan Engineering College, 517102, Tirupati, Andhra Pradesh, India

    K. Ayyappa Swamy

Authors
  1. K. Ayyappa Swamy
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  2. Zachariah C. Alex
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by K. Ayyappa Swamy. The first draft of the manuscript was written by K. Ayyappa Swamy and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Zachariah C. Alex.

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Swamy, K.A., Alex, Z.C. Efficient low delay reconfigurable filter bank using parallel structure for hearing aid applications with IoT. Pers Ubiquit Comput 27, 1381–1394 (2023). https://doi.org/10.1007/s00779-021-01600-w

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  • DOI: https://doi.org/10.1007/s00779-021-01600-w

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