Publications

2022

• Direction-Aware Joint Adaptation of Neural Speech Enhancement and Recognition in Real Multiparty Conversational Environments
  
  • Du Yicheng
  • Nugraha Aditya Arie
  • Sekiguchi Kouhei
  • Bando Yoshiaki
  • Fontaine Mathieu
  • Yoshii Kazuyoshi
  , 2022. This paper describes noisy speech recognition for an augmented reality headset that helps verbal communication with in real multiparty conversational environments. A major approach that has actively been studied in simulated environments is to sequentially perform speech enhancement and automatic speech recognition (ASR) based on deep neural networks (DNNs) trained in a supervised manner. In our task, however, such a pretrained system fails to work due to the mismatch between the training and test conditions and the head movements of the user. To enhance only the utterances of a target speaker, we use beamforming based on a DNN-based speech mask estimator that can adaptively extract the speech components corresponding to a head-relative particular direction. We propose a semi-supervised adaptation method that jointly updates the mask estimator and the ASR model at run-time using clean speech signals with ground-truth transcriptions and noisy speech signals with highly-confident estimated transcriptions. Comparative experiments using the state-of-theart distant speech recognition system show that the proposed method significantly improves the ASR performance.
• A new family of polyphase sequences with low correlation
  
  • Gu Zhi
  • Zhou Zhengchun
  • Mesnager Sihem
  • Parampalli Udaya
  Cryptography and Communications - Discrete Structures, Boolean Functions and Sequences, Springer, 2022, 14 (1), pp.135-144. (10.1007/s12095-021-00522-x)
  DOI : 10.1007/s12095-021-00522-x
• Preimages of p −Linearized Polynomials over ${\mathbb {F}}_{p}$
  
  • Kim Kwang Ho
  • Mesnager Sihem
  • Choe Jong Hyok
  • Lee Dok Nam
  Cryptography and Communications - Discrete Structures, Boolean Functions and Sequences, Springer, 2022, 14 (1), pp.75-86. (10.1007/s12095-021-00514-x)
  DOI : 10.1007/s12095-021-00514-x
• Spectral dispersion of the linewidth enhancement factor and four wave mixing conversion efficiency of an InAs/GaAs multimode quantum dot laser
  
  • Ding Shihao
  • Dong Bozhang
  • Huang Heming
  • Bowers John
  • Grillot Frédéric
  Applied Physics Letters, American Institute of Physics, 2022, 120 (8), pp.081105. The spectral dependence of the linewidth enhancement factor (a H-factor) of a multimode InAs/GaAs quantum dot laser is analyzed. Amplified spontaneous and high-frequency modulation methods are used to experimentally retrieve the a H-factor of each longitudinal mode below and above the threshold. A dispersion of the a H-factor is unlocked across the entire optical spectrum, which is further illustrated in the context of four wave mixing experiments. The results show that the induced conversion efficiency is increased at lasing wavelengths where the linewidth enhancement is lower. These results highlight the importance of carefully monitoring the linewidth enhancement factor in quantum dot lasers especially for frequency combs and mode-locking applications in future optical communication systems. (10.1063/5.0077221)
  DOI : 10.1063/5.0077221
• Unipolar quantum technology enabling high-speed free-space communication in the long-wave infrared regime
  
  • Didier P.
  • Dely H.
  • Spitz O.
  • Awwad Elie
  • Bonazzi Thomas
  • Rodriguez Etienne
  • Sirtori C.
  • Grillot Frédéric
  , 2022. <p>A combination of unipolar quantum laser, modulator and detector allows us to demonstrate a free-space communication at 40 Gbits/s and 9 µm far-infrared wavelength. The distance between the emitter and the receiver is 31 meters.</p> (10.1364/CLEO_AT.2022.JTh6A.5)
  DOI : 10.1364/CLEO_AT.2022.JTh6A.5
• Safety, Security and Performance Assessment of Security Countermeasures with SysML-Sec
  
  • Sultan Bastien
  • Apvrille Ludovic
  • Jaillon Philippe
  , 2022. Deploying security countermeasures on Cyber-Physical Systems (CPS) can induce side-effects that can exceed their benefits. When CPS are safety-critical systems, performing efficiency and impact assessments of security countermeasures early in the design flow is essential. The paper introduces the W-Sec method, based on SysML-Sec. The W-Sec method consists in two interwoven formal modeling and verification cycles aiming at providing countermeasures with objective and quantitative efficiency and impact assessments in terms of safety, security and performance. The paper evaluates the W-Sec method with an autonomous rover swarm case-study, and finally discusses the method's strengths and weaknesses highlighted by the case-study results. (10.5220/0010832300003119)
  DOI : 10.5220/0010832300003119