An improved proportionate delayless multiband-structured subband adaptive feedback canceller for digital hearing aids

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dc.contributor.author Pradhan, Somanath
dc.contributor.author Patel, Vinal
dc.contributor.author Somani, Dipen
dc.contributor.author George, Nithin V.
dc.date.accessioned 2017-05-23T10:31:33Z
dc.date.available 2017-05-23T10:31:33Z
dc.date.issued 2017-08
dc.identifier.citation Pradhan, Somanath; Patel, Vinal; Somani, Dipen and George, Nithin V., “An improved proportionate delayless multiband-structured subband adaptive feedback canceller for digital hearing aids”, IEEE/ACM Transactions on Audio, Speech and Language Processing, DOI: 10.1109/TASLP.2017.2705346, vol.25, no.8, pp.1633-1643 Aug. 2017. en_US
dc.identifier.issn 2329-9290
dc.identifier.issn 2329-9304
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/2946
dc.identifier.uri http://dx.doi.org/10.1109/TASLP.2017.2705346
dc.description.abstract Acoustic feedback cancellation is one of the challenging tasks in the design of a behind the ear (BTE) digital hearing aid. This feedback cancellation is usually achieved using an adaptive filter. The finite correlation between the desired microphone input signal and the input signal to the loudspeaker results in a biased estimation of the adaptive filter, which may produce disturbances in the hearing aid. Prediction error method (PEM) has been used in literature to reduce the bias effects. The convergence of a PEM based feedback canceller can be improved by implementing the adaptive filter in the subband domain. However, a direct subband implementation results in aliasing issues, band-edge problems and introduces a delay due to analysis and synthesis filters. In order to reduce the aliasing and delay issues, a delayless subband implementation of a PEM based feedback canceller is designed in this paper. A delayless multiband-structured subband implementation of the feedback canceller is also attempted to further reduce the aliasing and band-edge effects. This implementation aims at having all the subbands collectively updating the fullband adaptive filter, without the need for a subband to fullband weight conversion and offers improved feedback cancellation at reduced computational load in comparison with a delayless subband implementation of a PEM based feedback canceller. In addition, an attempt has been made to further improve the convergence behaviour by using an improved proportionate learning scheme. The improved convergence offered by the proposed scheme is evident from the simulation study. The improvement has been further quantified using a perceptual evaluation of speech quality and the proposed approach has been shown to provide enhanced speech quality. en_US
dc.description.statementofresponsibility by Somanath Pradhan, Vinal Patel, Dipen Somani and Nithin V. George
dc.format.extent vol.25, no.8, pp.1633-1643
dc.language.iso en en_US
dc.publisher IEEE en_US
dc.subject Hearing aids en_US
dc.subject Delays en_US
dc.subject Convergence en_US
dc.subject Acoustics en_US
dc.subject Speech en_US
dc.subject Microphones en_US
dc.subject Loudspeakers en_US
dc.title An improved proportionate delayless multiband-structured subband adaptive feedback canceller for digital hearing aids en_US
dc.type Article en_US
dc.relation.journal IEEE/ACM Transactions on Audio, Speech and Language Processing


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