arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.09422eess.AScs.SD
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基于变分自编码器的变异编码用于构音障碍语音识别

Variational Auto-Encoder Based Variability Encoding for Dysarthric Speech Recognition

Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences(中国科学院深圳先进技术研究院);Chinese University of Hong Kong(香港中文大学)

Xurong Xie, Rukiye Ruzi, Xunying Liu, Lan Wang

AI总结:

针对构音障碍语音声学变异难建模的问题,提出VAEVE编码器,利用音素信息与潜变量重建声学特征以提取音素无关变异编码,并在UASpeech上验证其与LHUC自适应互补且可降低WER。

摘要:

由于声学变异性以及可用数据量有限,构音障碍语音识别是一项具有挑战性的任务。构音障碍说话人的多种状况导致了声学变异性,这使得该变异性难以被精确建模。本文提出一种基于变分自编码器的变异编码器(VAEVE),以显式编码构音障碍语音中的此类变异性。VAEVE同时利用音素信息和低维潜变量来重建输入声学特征,从而迫使潜变量编码与音素无关的变异性。本文采用随机梯度变分贝叶斯算法来建模用于生成变异编码的分布,这些编码进一步用作DNN声学建模的辅助特征。在UASpeech语料库上进行的实验结果表明,基于VAEVE的变异编码与learning hidden unit contributions(LHUC)说话人自适应具有互补作用。使用变异编码的系统始终优于不使用这些编码的可比基线系统,并在“极低可懂度”等级的构音障碍语音上获得最高2.2%的绝对词错误率(WER)降低,在状况多样或不确定的“混合”类型构音障碍语音上获得最高2%的绝对WER降低。

英文摘要:

Dysarthric speech recognition is a challenging task due to acoustic variability and limited amount of available data. Diverse conditions of dysarthric speakers account for the acoustic variability, which make the variability difficult to be modeled precisely. This paper presents a variational auto-encoder based variability encoder (VAEVE) to explicitly encode such variability for dysarthric speech. The VAEVE makes use of both phoneme information and low-dimensional latent variable to reconstruct the input acoustic features, thereby the latent variable is forced to encode the phoneme-independent variability. Stochastic gradient variational Bayes algorithm is applied to model the distribution for generating variability encodings, which are further used as auxiliary features for DNN acoustic modeling. Experiment results conducted on the UASpeech corpus show that the VAEVE based variability encodings have complementary effect to the learning hidden unit contributions (LHUC) speaker adaptation. The systems using variability encodings consistently outperform the comparable baseline systems without using them, and" obtain absolute word error rate (WER) reduction by up to 2.2% on dysarthric speech with "Very lowintelligibility level, and up to 2% on the "Mixed" type of dysarthric speech with diverse or uncertain conditions.

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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