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An Adaptive Speech Enhancement System Based on Noise Level Estimation and Lateral Inhibition
Author: Choi, Jae Seung
Source: Acta Acustica united with Acustica, Volume 93, Number 4, July/August 2007 , pp. 632-644(13)
Publisher: S. Hirzel Verlag
Abstract:
In speech recognition under a noisy environment, a system is needed that can reduce noise, while enhancing speech. The human auditory system has an excellent analytical spectrum mechanism for speech enhancement. Accordingly, this paper proposes an adaptive method which is inspired by known human auditory mechanism, called lateral inhibition. This method first estimates noise intensity using a neural network, then adjusts frame by frame the coefficients of both the lateral inhibition and the amplitude component according to the noise intensity for each input frame. The proposed system is compared with the results of a conventional spectral subtraction method and minimum mean-square error log-spectral amplitude (MMSE-LSA) estimator at different noise levels. Experiments confirm that the proposed system is effective for speech degraded by various noises using objective (global SNR and spectral distortion) and subjective mean opinion score (MOS) evaluations.Document Type: Research article
Publication date: 2007-07-01
- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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