Digital noise reduction: an overview.
Digital noise reduction schemes are being used in most hearing aids currently marketed. Unlike the earlier analog schemes, these manufacturer-specific algorithms are developed to acoustically analyze the incoming signal and alter the gain/output characteristics according to their predetermined rules. Although most are modulation-based schemes (ie, differentiating speech from noise based on temporal characteristics), spectral subtraction techniques are being applied as well. The purpose of this article is to overview these schemes in terms of their differences and similarities.
Bentler
Ruth
R
Department of Speech Pathology & Audiology, University of Iowa, Iowa City, IA 52242, USA. ruth-bentler@uiowa.edu
Chiou
Li-Kuei
LK
D000465:Algorithms; D004867:Equipment Design; D006310:Hearing Aids / Q000266:history; D049673:History, 20th Century; D006801:Humans; D009622:Noise; D011930:Reaction Time; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013018:Sound Spectrography; D013060:Speech