检索结果-内蒙古大学图书馆

IEEE International Conference on computer Science and Automation Engineering (CSAE)

作者： Shi-Dan Lu Rong-Yi Cui Intelligent Information Processing Lab. Department of Computer Science & Technology Yanbian University Yanji China

A new classification feature extraction method for Chinese-Korean spoken language identification was proposed in this paper. Firstly, speech signal was divided into frame serial and the number of frames was counted. Furthermore, the ratio between short-time zero-crossing rate and short-time energy, i.e. short-time-frequency-energy-ratio (STFER), was computed, and the mean STFER per frame was treated as the classification feature to implement Chinese-Korean spoken language identification. Finally, the classification threshold was determined using information gain. Experimental results show that the proposed method is simpler than MFCC feature parameters and has better ability to identify spoken language with lower complexity, can be adopted in preprocessing procedure of language recognition.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Direction of arrival estimation of wideband signal based on particle filters

引用

Tien Tzu Hsueh Pao/Acta Electronica Sinica 2011年第6期39卷 1353-1357页

作者： Wu, Sun-Yong Liao, Gui-Sheng Yang, Zhi-Wei National Lab. of Radar Signal Processing Xidian University Xi'an Shaanxi 710071 China Department of Computational Science and Mathematics Guilin University of Electronic Technology Guilin Guangxi 541004 China

This paper proposes a new method for estimating the direction-of-arrival (DOA) of wideband signal, which employs particle filters to track array manifold at different frequency bands. Compared with the coherent signal-subspace method (CSM), the proposed method utilizes the current observed data and does not require the estimated covariance matrix, thus it performs better while considering a small sample set. In the meantime, this method does not require the preliminary DOA estimates. Moreover, the proposed method can localize completely correlated sources as it is based on the idea of maximum likelihood. Simulation results show that the performance of the propose method is better than CSM when the sample set is small, the signal to noise ratio (SNR) is low and the signal sources are correlated.

关键词： Direction of arrival

来源：评论

学校读者我要写书评

暂无评论

A robust keyword spotting system for Persian conversational telephone speech using feature and score normalization and ARMA filter

A robust keyword spotting system for Persian conversational ...

引用

IEEE GCC Conference & Exhibition

作者： Akram Shokri Shima Tabibian Ahmad Akbari Babak Nasersharif Jahanshah Kabudian Audio and Signal Processing Lab Computer Engineering Department Iran University of Science and Technology Iran Computer Engineering Department Faculty of Engineering University of Guilan Rasht Iran Research Center for Intelligent Signal Processing Tehran Iran

Keyword spotting (KWS) refers to detection of a limited number of given keywords in speech utterances. In this paper, we evaluate a robust keyword spotting system based on hidden markov models for speaker independent Persian conversational telephone speech. Performance of base line keyword spotter is improved by means of normalizing features using cepstral mean and variance normalization (CMVN) and cepstral gain normalization (CGN). And better performance is gained by applying auto-regressive moving average (ARMA) filter on normalized features. Experimental results show that although all these methods improve keyword spotting performance, CMVN and ARMA (MVA) processing of PLP features works much better on our Persian conversational telephone speech database and 41% improvement to baseline system is achieved at false alarm (FA) rate equal to 8.6 FA/KW/Hour.

关键词： Hidden Markov models Speech Computational modeling Mel frequency cepstral coefficient Filtering Speech recognition

来源：评论

学校读者我要写书评

暂无评论

Micro-motion characteristic analysis and recognition of cone-shaped targets

引用

Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University 2011年第2期38卷 105-111页

作者： Guan, Yongsheng Zuo, Qunsheng Liu, Hongwei Du, Lan Li, Yanbing National Key Lab. of Radar Signal Processing Xidian Univ. Xi'an 710071 China School of Telecommunication Engineering Xidian Univ. Xi'an 710071 China China Electronics Technology Group Corporation Beijing 100846 China

When the cone-shaped target is flying in exo-atmosphere, the micro-motion of the target belongs to a precession and that of the decoy belongs to a spin or a wobble. Because they are different in micro-motion, the characteristic spectrum is extracted as a recognition feature. The paper models multi-section radar signals and analyzes the micro-Doppler signature of the warhead and the decoy. Although the micro-Doppler Spectrum of precession targets, wobble targets and spin targets is approximated as a line-Spectrum, but there is a significant difference. Based on the harmonic model, eigenvalue decomposition is applied to compute the eigenvalue as the recognition feature. Simulation proves that the method is effective.

关键词： Radar target recognition

来源：评论

学校读者我要写书评

暂无评论

Multidimensional uncertainty visualization with parallel coordinate and star glyph

International Journal of Digital Content Technology and its ...

引用

International Journal of Digital Content technology and its Applications 2011年第6期5卷 412-420页

作者： He, Huaiqing Yang, Lei Xu, Qing College of Computer Science and Technology Civil Aviation University of China Tianjin 300300 China Tianjin Key Lab for Advanced Signal Processing Tianjin 300300 China College of Computer Science and Technology Tianjin University Tianjin 300372 China

Prior work about uncertainty visualization has been primarily focused on spatio-temporal or univariate data. Little research has been reported on exploring uncertainty of multidimensional data. Therefore, improved visualizations applying to parallel coordinate and star glyph will be discussed and utilized to visualize multidimensional uncertainty. Firstly, parallel coordinate will be modified through imposing visual variables and expanding traditional two-dimensional visualization to three-dimensional way. Then the concept of multi-view visualizationwill be put forward,multidimensional uncertainty of data will be mapped by interactive integration of the visual representations of Parallel Coordinate and Star Glyph, which utilizes the advantages of both representations to offset the disadvantages they have separately to overcome the shortcoming that traditional parallel coordinate cannot map order of data and the problem of overlapping polylines. Meanwhile, four HCI technologies such as brushing, Linking, Zooming in/out, Hiding are imposed to the improved visualizations to help users to focus on what they find interesting and details of corresponding data with different uncertainty intervals. Eventually, MFC and OPENGL technology will be combined to construct an experimental platform to validate our proposed new ideas.

关键词： Visualization

来源：评论

学校读者我要写书评

暂无评论

Rainfall simulation in flight view

International Journal of Digital Content Technology and its ...

引用

International Journal of Digital Content technology and its Applications 2011年第6期5卷 421-428页

作者： Haohan, Liu Huaiqing, He College of Computer Science and Technology Civil Aviation University of China Tianjin 300300 China College of Computer Science and Technology Tianjin University Tianjin 300372 China Tianjin Key Lab for Advanced Signal Processing Tianjin 300300 China

An improvement is made to traditional particle system technology in rainfall simulation. In order to improve the authenticity and flexibility of rainfall simulation and speed up the rendering speed, the particle rotation, particle dynamic texture, dynamic color etc. are introduced. The structure of particles is simplified. Meanwhile, a funnel model is adopted to adapt to the characteristics of a flight simulator. Experiment results show that the proposed method has gotten realistic visual effect and real-time speed, and is especially suitable for large flight simulator scene.

关键词： Flight simulators

来源：评论

学校读者我要写书评

暂无评论

A New On-Line/Off-Line Adaptive Antenna Array Beamformer for Tracking the Mobile Targets

引用

International Journal of Communications, Network and System Sciences 2011年第5期4卷 304-312页

作者： Shahriar Shirvani Moghaddam Mahyar Shirvani Moghaddam 1Digital communications signal Processing Research Lab. Faculty of Electrical and Computer Engineering Shahid Rajaee Teacher Training University (SRTTU) Tehran Iran 2Department of Electrical Engineering and Advanced Communication Research Institute Sharif University of Technology Tehran Iran

An adaptive antenna array system adjusts the main lobe of radiation pattern in the direction of desired signal and points the nulls in the direction of undesired signals or interferers. The essential goal of beamforming is to reduce the complexity of weighting process and to decrease the time needed for adjusting the antenna radiation pattern. In this article a new adaptive weighting algorithm is proposed for both least mean squares (LMS) and constant modulus (CM) algorithms. It is appropriate and applicable for antenna array systems with moving targets and also mobile applications as well as sensor networks. By predicting the relative velocity of source, the next location of the source will be estimated and the array weights will be determined using LMS or CM algorithm before arriving to the new point. For the next time associated to the new sampling point, evaluated weights will be used. Furthermore, by updating these weights between two consecutive times the effects of error propagation will be eliminated. Therefore, in addition to reduction in computational complexity at the time of weight allocation, relatively accurate weight allocation can be obtained. Simulation results of this investigation show that the angular error related to both LMS-based and CM-based algorithms is less than the conventional LMS and CM algorithms at different signal to noise ratios (SNRs). On the other hand, due to considering off-line process, online computational complexity of new algorithms is slightly low with respect to previous ones.

关键词： Beamforming Adaptive Antenna Array LMS CM Training-Based Blind

来源：评论

学校读者我要写书评

暂无评论

A new model of search engine based on cloud computing

International Journal of Digital Content Technology and its ...

引用

International Journal of Digital Content technology and its Applications 2011年第6期5卷 236-243页

作者： Ding, Jian-li Yang, Bo College of Computer Science and Technology Civil Aviation University of China Tianjin 300300 China Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China

With the rapid increase of websites and internet users, the traditional search engine will face great challenge in the real-time search, response speed and the storage of mass pages. However, the search engine deployed in the cloud can solve these shortcomings due to cloud computing with two major advantages in mass data processing and mass data storage. By analyzing the open-source cloud computing system Hadoop, a cloud platform search engine model is constructed and the core algorithm of search engine is optimized to improve the overall performance of search engine.

关键词： Cloud computing

来源：评论

学校读者我要写书评

暂无评论

signaling Enhancement for Machine Type Communications in GERAN Using Orthogonal Sub-Channels

Signaling Enhancement for Machine Type Communications in GER...

引用

IEEE Conference on Vehicular technology (VTC)

作者： R. C. D. Paiva R. D. Vieira M. Saily Lab. of Acoustics and Audio Signal Processing Aalto University Espoo Finland Nokia Technology Institute (INdT) Brasilia DF Brazil Nokia Siemens Networks Espoo Finland

Machine type communications have emerged with new types of applications and revenue sources both for network operators and cellular/network equipment companies. This new kind of service may increase significantly the number of devices accessing the network in the next few years, and could have some impacts over the current services, namely normal voice and data services. One important concern is related to effects of extreme cases where MTC devices may act in a synchronized way. In GSM networks, the signaling capacity may be temporarily blocked, limiting the access of normal services for some seconds, or even minutes. This paper proposes one solution for overload problem caused by MTC device synchronization using the Orthogonal sub- channels technique (OSC). Statistical analysis over the effects of synchronized MTC devices are used to provide an overview on the achievable access procedure delay reduction when using this technique. The proposed technique has proven to decrease the average delay of normal services by 70% and to reduce by 50% the overload period of the signaling channels.

关键词： Delay Synchronization GSM Receivers Training Probability Time division multiple access

来源：评论

学校读者我要写书评

暂无评论

Random Access Capacity Evaluation with Synchronized MTC Users over Wireless Networks

Random Access Capacity Evaluation with Synchronized MTC User...

引用

IEEE Conference on Vehicular technology (VTC)

作者： R. C. D. Paiva R. D. Vieira M. Saily Lab. of Acoustics and Audio Signal Processing Aalto University Espoo Finland Nokia Institute of Technology (INdT) Brasilia DF Brazil Nokia Siemens Networks Espoo Finland

Increased attention has been drawn to machine type communication (MTC) lately, which represents important extension for user functionality in today's technologies, as well as an important potential for marketing expansion. GERAN studies over MTC has mainly focused on applications requiring low throughput and wide coverage such as smart meter, which could cause some impacts over normal data users if operating in a synchronous manner. This paper proposes a new methodology for studying the impact on signaling channels when mixture of synchronous and asynchronous traffic is present in the network. This is based on statistical analysis, considering signaling accessing attempts as driven by a Poisson process. In this approach successive random access attempts by the mobile stations are considered as well as the response on the network side. First implementation is held for GSM/GPRS network, although generalization of the method for other technologies is possible. The simulated results show potential problems to be solved when a large number of synchronized users is present. Additionally, an analysis on the effects of the different levels of synchronization and the addition of extra signaling channels is included. Results also point out possible development paths that could be taken when designing new features to make networks more robust to synchronized traffic.

关键词： Delay Synchronization GSM Time division multiple access Mobile communication Ground penetrating radar Vehicular and wireless technologies

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：