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SPEECH ENHANCEMENT METHOD FOR LPC AUTOREGRESSIVE MODEL AND SYSTEM IMPLEMENTATION OF COMMAND WORD RECOGNITION USED IN noisy environment

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Transactions of Nanjing University of Aeronautics and Astronautics 1998年第2期15卷 113-120页

作者：王承发吕成国孙立新李俊庆哈尔滨工业大学计算机科学与工程系

At present, almost all the systems and products for speech recognition are working in quiet environment and their performances are degraded or even can′t work when they are operated in high noisy environment. In this paper, after analyzing the features of speech and noise, a speech enhancement method for LPC autoregressive model for command words recognition used in noisy environment is proposed, and an experimental system is realized. In different background noisy environments, we conduct experiments about SNR, basic accuracy, noise resistant ability and system environment adaptability with different microphones. The experimental results show that the system has good recognition performance in high noisy environments. The system can resist many kinds of noises and meet the needs of application areas on the whole such as military, traffic, marketplace and factory etc.

关键词： speech recognition noisy environment Wiener filter

Controlling transfer of quantum correlations among bi-partitions of a composite quantum system by combining different noisy environments

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Chinese Physics B 2011年第11期20卷 53-66页

作者：张修兴李福利 Department of Applied Physics Xi'an Jiaotong University

The correlation dynamics are investigated for various bi-partitions of a composite quantum system consisting of two qubits and two independent and non-identical noisy environments. The two qubits have no direct interaction with each other and locally interact with their environments. Classical and quantum correlations including the entanglement are initially prepared only between the two qubits. We find that contrary to the identical noisy environment case, the quantum correlation transfer direction can be controlled by combining different noisy environments. The amplitude- damping environment determines whether there exists the entanglement transfer among bi-partitions of the system. When one qubit is coupled to an amplitude-damping environment and the other one to a bit-flip one, we find a very interesting result that all the quantum and the classical correlations, and even the entanglement, originally existing between the qubits, can be completely transferred without any loss to the qubit coupled to the bit-flit environment and the amplitude-damping environment. We also notice that it is possible to distinguish the quantum correlation from the classical correlation and the entanglement by combining different noisy environments.

关键词： quantum correlation noisy environment

An Analysis on Convergence of Elitist Genetic Algorithms in noisy environments

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An Analysis on Convergence of Elitist Genetic Algorithms in ...

Portable atomic gravimeter operating in noisy urban environments

2011 4th IEEE International Conference on Computer Science and Information Technology(ICCSIT 2011)

作者： LI Jun-hua Key Laboratory of Nondestructive Testing(Ministry of Education)of Nanchang Hang Kong University Nanchang Jiangxi China Li Ming Key Laboratory of Nondestructive Testing(Ministry of Education)of Nanchang Hang Kong University Nanchang Jiangxi China

Random noise perturbs objective functions in many practical problems,and genetic algorithms（GAs）have been widely proposed as an effective optimization tool for dealing with noisy objective ***,little papers for convergence of genetic algorithms in noisy environments（GA- NE）have been *** this paper,a Markov chain that models elitist genetic algorithms in noisy environments（EGA- NE）was constructed under the circumstance that objective function is perturbed only by additive random noise,and it was proved to be an absorbing state Markov *** convergence of EGA-NE was proved on the basis of the character of the absorbing state Markov chain.

关键词： genetic algorithm noisy environment convergence

来源： cnki会议评论

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Chinese Optics Letters 2020年第9期18卷 8-13页

作者： Bin Chen Jinbao Long Hongtai Xie Chenyang Li Luokan Chen Bonan Jiang Shuai Chen Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Shanghai Branch CAS Center for Excellence in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaShanghai 201315China Shanghai Research Center for Quantum Sciences Shanghai 201315China

The gravimeter based on atom interferometry has potential wide applications on building gravity networks and geophysics as well as gravity assisted navigation. Here, we demonstrate experimentally a portable atomic gravimeter operating in the noisy urban environment. Despite the influence of noisy external vibrations, our portable atomic gravimeter reaches a sensitivity as good as 65 μGal/√Hz and a resolution of 1.1 μGal after 4000 s integration, being comparable to state-of-the-art atomic gravimeters. Our achievement paves the way for bringing the portable atomic gravimeter to field applications.

关键词： atomic gravimeter noisy environment

Influence of Noises on Remote State Preparation Using GHZ State

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Communications in Theoretical Physics 2008年第9期50卷 643-647页

作者： LIANG Hua-Qiu LIU Jin-Ming State Key Laboratory of Precision Spectroscopy Department of Physics East China Normal University Shanghai 200062 China Department of Physics Taizhou University Linhai 317000 China

Using a quantum channel consisting of a GHZ state exposed to noisy environment,we investigate how toremotely prepare an entangled state and a qubit state,*** solving the master equation in the Lindbladform,the influence of the various types of noises on the GHZ state is first *** we use the fidelity to describehow close the remotely prepared state and the initial state *** results show that the fidelity is a function of thedecoherence rates and the angles of the initial *** is found that for each of the two RSP schemes,the influence ofthe noise acting simultaneously in x,y,and z directions on the average fidelity is the strongest while the influence of thenoise acting in x or z direction on the average fidelity is relatively weaker.

关键词： remote state preparation fidelity GHZ state noisy environment