Filter Design and Amplitude Shaping Methodologies for De-Noising Digital Hearing Aids

Abstract

Uses of the digital hearing aids have been increased in last decades due to heavy noise pollution. The efficiency of the hearing aids is challenging under the presence of highly noisier environments. Therefore, it is highly required to design an efficient de noising method capable of reducing the excessive amplitude present in environment. It is also desirable to design the compact tiny digital herring aids easy to wear. This paper is focused to preset the de-noising methodologies for speech enhancement in digital hearing aids. Various methodologies based on FIR and IIR filter design are presented and performance is evaluated. It is observed that for short term speech samples the amplitude shaping methods become challenging task due to significant amplitude reduction during de-noising. Thus paper presets the adaptive scaling method for amplitude enhancement. The overall goal of paper to design efficient methodology for digital hearing aids.