Endangered Tujia Language Speech Enhancement Research Based on Improved DCGAN

Yu, Chongchong; Kang, Mengzhen; Chen, Yunbing; Li, Mengxiong; Taguchi, Dai

doi:10.1007/978-3-030-32381-3_32

Cited by 2 publications

(1 citation statement)

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“…Speech enhancement, currently the major approach to reduce noise’s influence, is applied mostly to speech recognition of majority languages [ 12 , 13 , 14 , 15 ]. Yu et al [ 16 ], applying speech enhancement to endangered languages, put forward an end-to-end speech enhancement model based on an improved deep convolutional generative adversarial network (DCGAN) to improve speech quality for Tujia language. For enhanced speeches, Yu et al undertook the perceptual evaluation of speech quality and calculated the mean opinion score of the listening quality objective.…”

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confidence: 99%

Improvement of Acoustic Models Fused with Lip Visual Information for Low-Resource Speech

Qian

et al. 2023

Sensors

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Endangered language generally has low-resource characteristics, as an immaterial cultural resource that cannot be renewed. Automatic speech recognition (ASR) is an effective means to protect this language. However, for low-resource language, native speakers are few and labeled corpora are insufficient. ASR, thus, suffers deficiencies including high speaker dependence and over fitting, which greatly harms the accuracy of recognition. To tackle the deficiencies, the paper puts forward an approach of audiovisual speech recognition (AVSR) based on LSTM-Transformer. The approach introduces visual modality information including lip movements to reduce the dependence of acoustic models on speakers and the quantity of data. Specifically, the new approach, through the fusion of audio and visual information, enhances the expression of speakers’ feature space, thus achieving the speaker adaptation that is difficult in a single modality. The approach also includes experiments on speaker dependence and evaluates to what extent audiovisual fusion is dependent on speakers. Experimental results show that the CER of AVSR is 16.9% lower than those of traditional models (optimal performance scenario), and 11.8% lower than that for lip reading. The accuracy for recognizing phonemes, especially finals, improves substantially. For recognizing initials, the accuracy improves for affricates and fricatives where the lip movements are obvious and deteriorates for stops where the lip movements are not obvious. In AVSR, the generalization onto different speakers is also better than in a single modality and the CER can drop by as much as 17.2%. Therefore, AVSR is of great significance in studying the protection and preservation of endangered languages through AI.

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