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

Autor: Zachariah C. Alex, K. Ayyappa Swamy
Rok vydání: 2021
Předmět:
Zdroj: Personal and Ubiquitous Computing. 27:1381-1394
ISSN: 1617-4917
1617-4909
DOI: 10.1007/s00779-021-01600-w
Popis: 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.
Databáze: OpenAIRE
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