Журналы — Речевые технологии — Выпуск №1/2017

The paper presents speech enhancement techniques for advanced smartphone-based hearing aid which originates from our free smartphone application “Petralex” recently released for iOS and Android devices. In the present contribution we develop a new solution which overcomes limitations of full-band processing and introduces extended functionality. The new processing scheme decomposes the signal into perceptually matched sliding bands and implements spectral gain shaping for hearing loss compensation, dynamic range compression, noise reduction and acoustic feedback suppression. We propose an acoustic feedback suppression algorithm that is based on spectral subtraction rule. The algorithm is robust to rapid changes in acoustic feedback path and according to experiments allows to achieve added stable gain up to 24 dB. The paper contains theoretical background, description of the implemented techniques and some experimental results.

Keywords: hearing aid, noise reduction, acoustic feedback suppression