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943 results on '"Yu, Jiangtao"'

2. Radio2Text: Streaming Speech Recognition Using mmWave Radio Signals

Author

Zhao, Running, Yu, Jiangtao, Zhao, Hang, and Ngai, Edith C. H.

Subjects
Computer Science - Sound, Computer Science - Computation and Language, Computer Science - Human-Computer Interaction, Electrical Engineering and Systems Science - Audio and Speech Processing
Abstract

Millimeter wave (mmWave) based speech recognition provides more possibility for audio-related applications, such as conference speech transcription and eavesdropping. However, considering the practicality in real scenarios, latency and recognizable vocabulary size are two critical factors that cannot be overlooked. In this paper, we propose Radio2Text, the first mmWave-based system for streaming automatic speech recognition (ASR) with a vocabulary size exceeding 13,000 words. Radio2Text is based on a tailored streaming Transformer that is capable of effectively learning representations of speech-related features, paving the way for streaming ASR with a large vocabulary. To alleviate the deficiency of streaming networks unable to access entire future inputs, we propose the Guidance Initialization that facilitates the transfer of feature knowledge related to the global context from the non-streaming Transformer to the tailored streaming Transformer through weight inheritance. Further, we propose a cross-modal structure based on knowledge distillation (KD), named cross-modal KD, to mitigate the negative effect of low quality mmWave signals on recognition performance. In the cross-modal KD, the audio streaming Transformer provides feature and response guidance that inherit fruitful and accurate speech information to supervise the training of the tailored radio streaming Transformer. The experimental results show that our Radio2Text can achieve a character error rate of 5.7% and a word error rate of 9.4% for the recognition of a vocabulary consisting of over 13,000 words., Comment: Accepted by Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (ACM IMWUT/UbiComp 2023)

Published
2023
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5. Convexity of 2-convex translating and expanding solitons to the mean curvature flow in $\mathbb{R}^{n+1}$

Author

Xie, Junming and Yu, Jiangtao

Subjects
Mathematics - Differential Geometry, 53E10, 53C21, 53C42
Abstract

In this paper, inspired by the work of Spruck-Xiao [27] and based partly on a result of Derdzi\'nski [11], we prove the convexity of complete 2-convex translating and expanding solitons to the mean curvature flow in $\mathbb{R}^{n+1}$. More precisely, for $n\geq 3$, we show that any $n$-dimensional complete 2-convex translating solitons are convex, and any $n$-dimensional complete 2-convex self-expanders asymptotic to (strictly) mean convex cones are convex., Comment: 15 pages

Published
2022
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8. Radio2Speech: High Quality Speech Recovery from Radio Frequency Signals

Author

Zhao, Running, Yu, Jiangtao, Li, Tingle, Zhao, Hang, and Ngai, Edith C. H.

Subjects
Computer Science - Sound, Electrical Engineering and Systems Science - Audio and Speech Processing
Abstract

Considering the microphone is easily affected by noise and soundproof materials, the radio frequency (RF) signal is a promising candidate to recover audio as it is immune to noise and can traverse many soundproof objects. In this paper, we introduce Radio2Speech, a system that uses RF signals to recover high quality speech from the loudspeaker. Radio2Speech can recover speech comparable to the quality of the microphone, advancing from recovering only single tone music or incomprehensible speech in existing approaches. We use Radio UNet to accurately recover speech in time-frequency domain from RF signals with limited frequency band. Also, we incorporate the neural vocoder to synthesize the speech waveform from the estimated time-frequency representation without using the contaminated phase. Quantitative and qualitative evaluations show that in quiet, noisy and soundproof scenarios, Radio2Speech achieves state-of-the-art performance and is on par with the microphone that works in quiet scenarios., Comment: Accepted to INTERSPEECH 2022

Published
2022

35. On Complete Gradient Steady Ricci Solitons with Vanishing D-tensor

Author

Cao, Huai-Dong and Yu, Jiangtao

Subjects
Mathematics - Differential Geometry, 53C21
Abstract

In this paper, we extend the work of Cao-Chen [9] on Bach-flat gradient Ricci solitons to classify $n$-dimensional ($n\ge 5$) complete $D$-flat gradient steady Ricci solitons. More precisely, we prove that any $n$-dimensional complete noncompact gradient steady Ricci soliton with vanishing $D$-tensor is either Ricci-flat, or isometric to the Bryant soliton. Furthermore, the proof extends to the shrinking case and the expanding case as well., Comment: 10 pages; final version to appear in Proc. Amer. Math. Soc. arXiv admin note: text overlap with arXiv:1105.3163

Published
2020
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45. Research on Kinematic Characteristics of the Gear Rotating Guide-bar Mechanism Based on Differential of the Rotational Vector

Author

Li Desheng, Wang Zhijun, Yu Jiangtao, Feng Yongli, Huang Baowang, and Li Zhanxian

Subjects
Differential of rotational vector, Hypocycloid, Rotating guide-bar mechanism, Kinematic characteristics, Mechanical engineering and machinery, TJ1-1570
Abstract

According to the principle of cycloid generation, the gear rotating guide bar mechanism is designed. The motion matrix equation of the mechanism is given by the method of rotation vector differentiation, and the influence of the number of cycloid lobes and the position of the rocker on the motion characteristics of the mechanism is studied. The results show that the lobe number of the hypocycloid only affects the rotating guide-bar on the angular velocity pulsation, but has little effect on the velocity pulsation. There will be two spike pulses on the angular velocity of the rotating guide-bar when the oscillating slider is located at the axisymmetric line on the sharp corner side, which however would be only one at other locations except center of the hypocycloid. The position of the rocking block only affects the phase angle of the planetary gear during uniform acceleration motion of the rotating guide rod, but it has no effect on the phase angle of the planetary gear during uniform deceleration motion.

Published
2023
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