Use of Speech Impairment Severity for Dysarthric Speech Recognition

• URL: http://arxiv.org/abs/2305.10659v1
• Date: Thu, 18 May 2023 02:42:59 GMT
• Title: Use of Speech Impairment Severity for Dysarthric Speech Recognition
• Authors: Mengzhe Geng, Zengrui Jin, Tianzi Wang, Shujie Hu, Jiajun Deng, Mingyu Cui, Guinan Li, Jianwei Yu, Xurong Xie, Xunying Liu
• Abstract summary: This paper proposes a novel set of techniques to use both severity and speaker-identity in dysarthric speech recognition. Experiments conducted on UASpeech suggest incorporating speech impairment severity into state-of-the-art hybrid DNN, E2E Conformer and pre-trained Wav2vec 2.0 ASR systems.
• Score: 37.93801885333925
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A key challenge in dysarthric speech recognition is the speaker-level diversity attributed to both speaker-identity associated factors such as gender, and speech impairment severity. Most prior researches on addressing this issue focused on using speaker-identity only. To this end, this paper proposes a novel set of techniques to use both severity and speaker-identity in dysarthric speech recognition: a) multitask training incorporating severity prediction error; b) speaker-severity aware auxiliary feature adaptation; and c) structured LHUC transforms separately conditioned on speaker-identity and severity. Experiments conducted on UASpeech suggest incorporating additional speech impairment severity into state-of-the-art hybrid DNN, E2E Conformer and pre-trained Wav2vec 2.0 ASR systems produced statistically significant WER reductions up to 4.78% (14.03% relative). Using the best system the lowest published WER of 17.82% (51.25% on very low intelligibility) was obtained on UASpeech.

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