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Title: A decision-directed adaptive gain equalizer for assistive hearing instruments
Authors: Chan, KY
Low, SY
Nordholm, S
Yiu, KFC 
Keywords: Adaptive gain equalizer (AGE)
Assistive hearing instruments
Heuristic algorithms
Particle swarm optimization (PSO)
Perceptual evaluation of speech quality (PESQ)
Single channel filter
Speech booster
Speech enhancement
Issue Date: 2014
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on instrumentation and measurement, 2014, v. 63, no. 8, p. 1886-1895 How to cite?
Journal: IEEE transactions on instrumentation and measurement 
Abstract: Assistive hearing instruments have a significant impact on speech enhancement when the signal-to-noise ratio is low. These instruments are usually developed using the conventional adaptive gain equalizer (AGE), which has low computational complexity and low distortion in real-time speech enhancement. The conventional AGEs are intended to boost the speech segments of speech signals but they are incapable of suppressing noise segments. The overall speech quality of the assistive hearing instruments may be reduced, as the noise segments still cannot be filtered out. In this paper, a decision-directed AGE is proposed for assistive hearing instruments. It aims to overcome the limitation of the conventional AGE, which is capable only of boosting speech segments in noisy speech but incapable of suppressing noise segments. The proposed approach simultaneously boosts the speech segments and suppresses noise segments in noisy speech. Experimental results with different types of real-world noise indicate that the proposed method achieves better speech quality than does the conventional AGE. The resulting method provides an improved functionality for assistive hearing instruments.
ISSN: 0018-9456
EISSN: 1557-9662
DOI: 10.1109/TIM.2014.2302242
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