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arXiv 1806.04885eess.AScs.SD
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基于模型的语音增强提高双耳助听器的可懂度

Model-based Speech Enhancement for Intelligibility Improvement in Binaural Hearing Aids

Aalborg University(奥尔堡大学);GN Hearing(GN听力公司)

Mathew Shaji Kavalekalam, Jesper K. Nielsen, Jesper B. Boldt, Mads G. Christensen

摘要:

在诸如鸡尾酒会场景的情况下,听力受损个体的语音清晰度通常严重下降。目前的助听器技术的性能已经被观察到在这些情况下受到限制。在本文中,我们提出了一个双耳语音增强框架,考虑到语音产生模型。这里提出的增强框架是基于卡尔曼滤波器,使我们能够考虑到在增强过程中的语音生产动态。卡尔曼滤波器的使用需要估计干净语音和噪声短期预测器(STP)参数以及干净语音音调参数。在这项工作中,提出了一种基于双耳码本的方法来估计STP参数,并使用基于谐波模型和最大似然原理的方向性基音估计器来估计基音参数。所提出的用于估计STP和基音参数的方法联合使用来自左右耳的信息,导致滤波器参数的更鲁棒的估计。客观的措施,如PESQ和STOI已被用来评估在不同的声学场景代表鸡尾酒会的情况下的增强框架。我们还对9名听力正常的受试者进行了主观听力测试,以评估清晰度和质量改善方面的性能。听力测试表明,该算法,即使只有一个通道的噪声观察,显着提高整体语音质量,和语音清晰度高达15%。

英文摘要:

Speech intelligibility is often severely degraded among hearing impaired individuals in situations such as the cocktail party scenario. The performance of the current hearing aid technology has been observed to be limited in these scenarios. In this paper, we propose a binaural speech enhancement framework that takes into consideration the speech production model. The enhancement framework proposed here is based on the Kalman filter that allows us to take the speech production dynamics into account during the enhancement process. The usage of a Kalman filter requires the estimation of clean speech and noise short term predictor (STP) parameters, and the clean speech pitch parameters. In this work, a binaural codebook-based method is proposed for estimating the STP parameters, and a directional pitch estimator based on the harmonic model and maximum likelihood principle is used to estimate the pitch parameters. The proposed method for estimating the STP and pitch parameters jointly uses the information from left and right ears, leading to a more robust estimation of the filter parameters. Objective measures such as PESQ and STOI have been used to evaluate the enhancement framework in different acoustic scenarios representative of the cocktail party scenario. We have also conducted subjective listening tests on a set of nine normal hearing subjects, to evaluate the performance in terms of intelligibility and quality improvement. The listening tests show that the proposed algorithm, even with access to only a single channel noisy observation, significantly improves the overall speech quality, and the speech intelligibility by up to 15%.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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