Noise reduction and loudness compression in a wavelet modelling of the auditory system

Proceedings of the 2000 Third IEEE International Caracas Conference on Devices, Circuits and Systems (Cat. No.00TH8474) Pub Date : 2000-03-15 DOI:10.1109/ICCDCS.2000.869868

T. de Perez, Min Li, H. McAllister, N. Black

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引用次数: 2

Abstract

Describes the modelling of the normal auditory and hearing-impaired system for hearing aid design and addresses two major problems: noise reduction and loudness compression. This new integrated approach is based on a wavelet transform and a formulation of temporal and spectral psychoacoustic models of masking and loudness sensation. Within the model, a new subtraction algorithm is developed to model the masking phenomena and reduce noise in single-input systems. As a result, the enhanced speech quality has been significantly improved, especially in unvoiced portions. The noise component during silent periods has been attenuated by up to 20 dB. The auditory loudness sensation is also modelled with a homomorphic AGC for time-varying frequency-dependent compensation for loudness recruitment. The dynamic nonlinear weighting is a function of the wavelet coefficients. The homomorphic approach is found to be superior to linear AGC. Finally, the performance of the whole model is evaluated and compared with that obtained using the Chabries's model, and a significant improvement is found. It is concluded that optimal wavelet subtraction and homomorphic AGC are an appropriate combination to synergise noise reduction and loudness recruitment problems in hearing aid design.

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听觉系统的小波建模中的降噪和响度压缩

描述了助听器设计的正常听觉和听力受损系统的建模，并解决了两个主要问题:降噪和压缩响度。这种新的综合方法是基于小波变换和掩蔽和响度感觉的时间和频谱心理声学模型的公式。在该模型中，开发了一种新的减法算法来模拟单输入系统中的掩蔽现象并降低噪声。因此，增强的语音质量得到了显着改善，特别是在不发音的部分。在静音期间的噪声成分已衰减高达20分贝。听觉响度感觉也用同态AGC建模，用于响度补充的时变频率补偿。动态非线性加权是小波系数的函数。发现同态方法优于线性AGC方法。最后，对整个模型的性能进行了评估，并与使用Chabries模型得到的结果进行了比较，发现了显著的改进。综上所述，最佳小波减法和同态AGC是助听器设计中降噪和增声问题的合适组合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the 2000 Third IEEE International Caracas Conference on Devices, Circuits and Systems (Cat. No.00TH8474)

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