Broadband achromatic flexural wave Mikaelian lens for high resolution focusing

Chen, Jin; He, Xudong; Chen, Mingji; Liu, Yongquan

doi:10.1088/1361-6463/ac72d1

Cited by 2 publications

(1 citation statement)

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“…Nonetheless, for most of the methods mentioned above, a fixed frequency or a specific frequency range with a relatively small bandwidth is applicable. In contrast to the previous works, Chen et al [31] designed a flexural wave Mikaelian lens for high resolution focusing through igniting evanescent waves at the interface of conformally mapped Mikaelian lens with hyperbolic secant refractive index profile. After that, Li et al [32] proposed a new method to improve the focusing of reflected waves based on the division of a metasurface lens into two adjacent lenses having inner angles.…”

Section: Introductionmentioning

confidence: 99%

Infectious Hospital Area, the First Affiliated Hospital of University of Science and Technology of China, Hefei, China

Zhao¹,

Hu²,

Xue³

et al. 2021

BEBM

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With advances in deep learning, neural network based speech enhancement (SE) has developed rapidly in the last decade. Meanwhile, the self-supervised pre-trained model and vector quantization (VQ) have achieved excellent performance on many speech-related tasks, while they are less explored on SE. As it was shown in our previous work that utilizing a VQ module to discretize noisy speech representations is beneficial for speech denoising, in this work we therefore study the impact of using VQ at different layers with different number of codebooks. Different VQ modules indeed enable to extract multiplegranularity speech features. Following an attention mechanism, the contextual features extracted by a pre-trained model are fused with the local features extracted by the encoder, such that both global and local information are preserved to reconstruct the enhanced speech. Experimental results on the Valentini dataset show that the proposed model can improve the SE performance, where the impact of choosing pre-trained models is also revealed.

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Section: Introductionmentioning

confidence: 99%