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arXiv 2201.06685eess.AScs.SD
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人工制品有多糟糕?:语音增强误差对ASR的影响分析

How Bad Are Artifacts?: Analyzing the Impact of Speech Enhancement Errors on ASR

NTT(日本电报电话公司)

Kazuma Iwamoto, Tsubasa Ochiai, Marc Delcroix, Rintaro Ikeshita, Hiroshi Sato, Shoko Araki, Shigeru Katagiri

摘要:

利用单通道语音增强(SE)提高噪声环境下的自动语音识别(ASR)性能是一个具有挑战性的问题。在本文中,我们调查ASR性能下降的原因分解SE错误使用正交投影分解(OPD)。OPD将SE误差分解为噪声和伪影分量。伪影分量被定义为不能表示为语音和噪声源的线性组合的SE误差信号。我们建议手动缩放错误组件,以分析其对ASR的影响。我们实验确定的工件组件的性能下降的主要原因,我们发现,减轻工件可以大大提高ASR的性能。此外,我们还证明了简单观察添加(OA)技术(即,将所观察信号的缩放版本添加到增强语音)可以在温和条件下单调地增加信号与伪像比。因此,我们通过实验证实,OA提高了模拟和真实录音的ASR性能。本文的研究结果提供了一个更好的理解的影响SE错误的ASR和打开大门,未来的研究新的方法,设计有效的单通道SE前端的ASR。

英文摘要:

It is challenging to improve automatic speech recognition (ASR) performance in noisy conditions with single-channel speech enhancement (SE). In this paper, we investigate the causes of ASR performance degradation by decomposing the SE errors using orthogonal projection-based decomposition (OPD). OPD decomposes the SE errors into noise and artifact components. The artifact component is defined as the SE error signal that cannot be represented as a linear combination of speech and noise sources. We propose manually scaling the error components to analyze their impact on ASR. We experimentally identify the artifact component as the main cause of performance degradation, and we find that mitigating the artifact can greatly improve ASR performance. Furthermore, we demonstrate that the simple observation adding (OA) technique (i.e., adding a scaled version of the observed signal to the enhanced speech) can monotonically increase the signal-to-artifact ratio under a mild condition. Accordingly, we experimentally confirm that OA improves ASR performance for both simulated and real recordings. The findings of this paper provide a better understanding of the influence of SE errors on ASR and open the door to future research on novel approaches for designing effective single-channel SE front-ends for ASR.

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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