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Petralex: A smartphone-based real-time digital hearing aid with combined noise reduction and acoustic feedback suppression

The paper presents an implementation of an improved smartphone-based hearing aid which originates from our free smartphone application “Petralex” released for iOS and Android devices. In the present contribution we develop a new processing scheme that decomposes the signal into perceptually matched sliding bands and implements combined noise reduction and acoustic feedback suppression (AFS). The proposed AFS algorithm is based on spectral subtraction rule. The algorithm is robust to rapid changes in acoustic feedback path and considerably increases maximum stable gain.