Based on studies previously reported in this paper, it may be that attention is being focused partly in the wrong direction – not just to improving the signal-to-noise ratio (SNR) through noise reduction and speech enhancement algorithms, but adding to this, a wider frequency bandwidth as provided by the SeboTek HD2 series. Missing in these studies has been the potential impact of a wider bandwidth because of the limited range of the hearing aids used. Similarly, noise reduction algorithms implemented in wearable hearing aids revealed no significant intelligibility benefit, but improved ease of listening and listening comfort for hearing-impaired listeners (Bentler, Wu, Kettelet, & Hurtig, 2008). When evaluated, some speech algorithms may show a speech quality improvement, but not an improvement in speech intelligibility (Loizou, 2007 Hu & Loizou, 2007). Contemporary hearing aids have been designed with proprietary speech and noise algorithms, including the SeboTek HD2.
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