检索结果-内蒙古大学图书馆

IEEE North-East Workshop on Circuits and Systems (IEEE-MWCAS'07)

作者： C. Shahnaz W. P. Zhu M. O. Ahmad Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In this paper, a bifeature algorithm for the voiced/unvoiced (V/UV) discrimination of noise degraded speech signals is presented. A measure of merit for periodicity, and a normalized low frequency energy ratio are encompassed as two speech features which are proposed to derive from the Linear Prediction (LP) residual of the pre-processed noisy speech. Based on the statistically determined signal-dependent initial-thresholds of the features, a logical and multi-check V/UV classification criterion is developed which is capable of significantly removing the artifacts in the transitional frames between voiced and unvoiced regions. Through Simulation results, a superior performance of the proposed V/UV discrimination scheme for noisy speech has been illustrated compared to some of the existing methods.

关键词： Speech enhancement Low-frequency noise Frequency Speech analysis Additive noise signal processing algorithms Speech processing signal to noise ratio Degradation Energy measurement

来源：评论

学校读者我要写书评

暂无评论

Interior-Point Algorithms for Sum-Of-Squares Optimization of Multidimensional Trigonometric Polynomials

Interior-Point Algorithms for Sum-Of-Squares Optimization of...

引用

International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Tae Roh Bogdan Dumitrescu Lieven Vandenberghe Electrical Engineering Department University of California Los Angeles Los Angeles CA USA International Center for Signal Processing Tampere University of Technology Tampere Finland Department of Automatic Control and Computer Politechnica University of Bucharest Romania

A wide variety of optimization problems involving nonnegative polynomials or trigonometric polynomials can be formulated as convex optimization problems by expressing (or relaxing) the constraints using sum-of-squares representations. The semidefinite programming problems that result from this formulation are often difficult to solve due to the presence of large auxiliary matrix variables. In this paper we extend a recent technique for exploiting structure in semidefinite programs derived from sum-of-squares expressions to multivariate trigonometric polynomials. The technique is based on an equivalent formulation using discrete Fourier transforms and leads to a very substantial reduction in the computational complexity. Numerical results are presented and a comparison is made with general-purpose semidefinite programming algorithms. As an application, we consider a two-dimensional FIR filter design problem.

关键词： Multidimensional systems Polynomials signal processing algorithms Multidimensional signal processing Constraint optimization Discrete Fourier transforms Computational complexity Finite impulse response filter Optimization methods Digital filters

来源：评论

学校读者我要写书评

暂无评论

A New Segmentation Algorithm Combined with Transient Frames Power for Text Independent Speaker Verification

A New Segmentation Algorithm Combined with Transient Frames ...

引用

International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： R. Saeidi H. R. Sadegh Mohammadi R. D. Rodman T. Kinnunen Research Center for Intelligent Signal Processing Tehran Iran Iranian Research Institute of Electrical Engineering Tehran Iran Department of Computer Science North Carolina State University Raleigh NC USA Institute for Infocomm Research Singapore

In this paper we propose a new segmentation algorithm called delta MFCC based speech segmentation (DMFCC-SS), with application to speaker recognition systems. We show that DMFCC-SS can separate the regions of speech that result from similar likelihood scores using models such as a Gaussian mixture model (GMM), and can therefore be used to identify the regions of speech between two transitional states in a speech signal. By combining this segmentation algorithm with the discriminative power of transient frames in speaker recognition, we can investigate the tradeoff in speed-up rates that result from DMFCC-SS, with speaker verification equal error rates that result from representatives of each segment. We use a universal background model Gaussian mixture model (UBM-GMM) as a baseline system. The proposed speed-up algorithm, working in the pre-processing stage, performs well while having no computational load compared to the main GMM system. Experimental results show the superior performance of this pre-processing method in comparison with other algorithms working in the pre-processing stage of a UBM-GMM system.

关键词： signal processing algorithms Speaker recognition Power system modeling Mel frequency cepstral coefficient computer science Speech processing Application software signal processing Error analysis Cepstral analysis

来源：评论

学校读者我要写书评

暂无评论

EVALUATION OF 802.16 TARIFF PROPORTION ON SEGMENTATION SCENARIOS

EVALUATION OF 802.16 TARIFF PROPORTION ON SEGMENTATION SCENA...

引用

18th International Symposium on Personal, Indoor and Mobile Radio communications (PIMRC 2007), vol.3

作者： Muhammad Suryanegara Dhany Krishna Murti Dadang Gunawan Wireless and Signal Processing Research Group Center for Information and Communications Engineering Research Department of Electrical Engineering Universitas Indonesia Depok Indonesia

The most prominent features of WiMAX (IEEE 802.16 Standard) are it's wide coverage and high speed data-rate. A segmentation for WiMAX subscribers is needed by operators in order to reach all available subscriber types (class 1=Platinum, class 2=Gold, dan class 3=Silver). A segmentation for WiMAX subscribers could also optimize the use of available bandwidth, according to the characteristics of each subscriber type. By segmenting potential customers, operators need to differentiate their tariff to reach expected profit. We evaluated tariffs composition scheme for segmented customers in metropolitan and rural area as general reference for operators. The calculations are based on model and algorithm considering WiMAX technical configurations, operator's profit expectation, cost per users and tariff offered. The algorithm applied several models to meet possible classification and segmentation. As calculation example, we use specific parameters on typical WiMAX Business Model.

关键词： WiMAX Bandwidth Mobile communication Land mobile radio signal processing algorithms Costs OFDM Demography Platinum Gold

来源：评论

学校读者我要写书评

暂无评论

Control of nonlinear systems with a linear state-feedback controller and a modified neural network tuned by genetic algorithm

Control of nonlinear systems with a linear state-feedback co...

引用

Congress on Evolutionary Computation

作者： H.K. Lam S.H. Ling H.H.C. Iu C.W. Yeung F.H.F. Leung Division of Engineering King''s College London UK School of Electrical Electronic and Computer Engg University of Western Australia WA Australia Center for Signal Processing Department of Electronic and Information Engg Hong Kong Polytechnic University Hung Hom China

This paper presents the control of nonlinear systems with a neural network. In the proposed neural network, the neuron has two activation functions and exhibits a node-to-node relationship in the hidden layer. By using a genetic algorithm with arithmetic crossover and non-uniform mutation, the parameters of the proposed neural network can be tuned. Application examples are given to illustrate the merits of the proposed neural network.

关键词： Nonlinear control systems Control systems Nonlinear systems Neural networks Genetic algorithms Evolutionary computation

来源：评论

学校读者我要写书评

暂无评论

Designing an embedded video processing camera using a 16-bit microprocessor for a surveillance system

引用

Journal of VLSI signal processing Systems for signal, Image, and Video Technology 2006年第1期42卷 57-68页

作者： Sato, Koichi Evans, Brian L. Aggarwal, J.K. Department of Electrical and Computer Engineering Computer and Vision Research Center University of Texas at Austin Austin TX 78712 United States Department of Electrical and Computer Engineering Embedded Signal Processing Laboratory University of Texas at Austin Austin TX 78712 United States Department of Electrical and Computer Engineering University of Texas Austin Design and Implementation of Signal Processing Systems Technical Committee IEEE Signal Processing Society IEEE Department of Electrical and Computer Engineering Computer and Vision Research Center IEEE Computer Society

This paper describes the design and implementation of a hybrid intelligent surveillance system that consists of an embedded system and a personal computer (PC)-based system. The embedded system performs some of the image processing tasks and sends the processed data to the PC. The PC tracks persons and recognizes two-person interactions by using a grayscale side view image sequence captured by a stationary camera. Based on our previous research, we explored the optimum division of tasks between the embedded system and the PC, simulated the embedded system using dataflow models in Ptolemy, and prototyped the embedded system in real-time hardware and software using a 16-bit CISC microprocessor. This embedded system processes one 320 × 240 frame in 89 ms, which yields one-third of the rate of 30 Hz video system. In addition, the real-time embedded system prototype uses 5.7 K bytes of program memory, 854 K bytes of internal data memory and 2 M bytes external DRAM. © Springer Science + Business Media, Inc. 2006.

关键词： Microprocessor chips

来源：评论

学校读者我要写书评

暂无评论

Novel Applications of Noise in Sensing and communications

引用

AIP Conference Proceedings 2007年第1期922卷 405-410页

作者： Laszlo B. Kish Robert Mingesz Zoltan Gingl Gabor Schmera Janusz Smulko Chiman Kwan Peter Heszler Claes‐Goran Granqvist 1Texas A&M University Department of Electrical and Computer Engineering College Station TX 77843‐3128 2University of Szeged Department of Experimental Physics Dom ter 9 Szeged H‐6720 Hungary 3Space and Naval Warfare Systems Center San Diego CA 92152‐5001 4Gdansk University of Technology WETiI ul. G. Narutowicza 11/12 80‐952 Gdansk Poland 5Signal Processing Inc. 13619 Valley Oak Circle Rockville MD 20850 6Research Group of Laser Physics of the Hungarian Academy of Sciences University of Szeged P.O. Box 406 H‐6701 Szeged Hungary 7Department of Engineering Sciences The Ångström Laboratory Uppsala University P.O. Box 534 SE‐751 21 Uppsala Sweden

Recently, it has been shown that excess noises generated or modified by chemical agents can be used to detect and identify chemicals with enhanced sensitivity and selectivity. Moreover thermal noise and its artificial versions (Johnson‐like noises) can be utilized as information carriers with peculiar properties. The first application is called Fluctuation‐Enhanced Sensing. The second class can be called Thermal Noise Informatics with relevant topics are Zero Power Classical Communication and (in the quantum limit) Zero‐Quantum Quantum Communication; Thermal Noise Driven Computing; and Totally Secure Classical Communication. In the paper version of this talk, we will briefly describe the scope of these fields and in the oral talk we also provide extended considerations and results.

关键词：

来源：评论

学校读者我要写书评

暂无评论

New radix-(2/spl times/2/spl times/2)/(4/spl times/4/spl times/4) and radix-(2/spl times/2/spl times/2)/(8/spl times/8/spl times/8) DIF FFT algorithms for 3-D DFT

引用

IEEE Transactions on Circuits and Systems I: Regular Papers 2006年第2期53卷 306-315页

作者： S. Bouguezel M.O. Ahmad M.N.S. Swamy Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Canada

In this paper, new three-dimensional (3-D) radix-(2/spl times/2/spl times/2)/(4/spl times/4/spl times/4) and radix-(2/spl times/2/spl times/2)/(8/spl times/8/spl times/8) decimation-in-frequency (DIF) fast Fourier transform (FFT) algorithms are developed and their implementation schemes discussed. The algorithms are developed by introducing the radix-2/4 and radix-2/8 approaches in the computation of the 3-D DFT using the Kronecker product and appropriate index mappings. The butterflies of the proposed algorithms are characterized by simple closed-form expressions facilitating easy software or hardware implementations of the algorithms. Comparisons between the proposed algorithms and the existing 3-D radix-(2/spl times/2/spl times/2) FFT algorithm are carried out showing that significant savings in terms of the number of arithmetic operations, data transfers, and twiddle factor evaluations or accesses to the lookup table can be achieved using the radix-(2/spl times/2/spl times/2)/(4/spl times/4/spl times/4) DIF FFT algorithm over the radix-(2/spl times/2/spl times/2) FFT algorithm. It is also established that further savings can be achieved by using the radix-(2/spl times/2/spl times/2)/(8/spl times/8/spl times/8) DIF FFT algorithm.

关键词： signal processing algorithms Discrete Fourier transforms Fast Fourier transforms Arithmetic Software algorithms Polynomials Multidimensional systems Closed-form solution Hardware Table lookup

来源：评论

学校读者我要写书评

暂无评论

An Alternate Approach for Developing Higher Radix FFT Algorithms

An Alternate Approach for Developing Higher Radix FFT Algori...

引用

IEEE Asia-Pacific Conference on Circuits and Systems

作者： Saad Bouguezel M. Omair Ahmad M.N.S. Swamy Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal Canada

In this paper, the authors propose an alternate method to derive higher radix FFT algorithms by using a recursive approach and by appropriately combining the twiddle factors without increasing the structural complexity. Specifically, efficient radix-8 and radix-16 FFT algorithms are designed and their arithmetic complexities shown to be slightly less than those of the corresponding existing Cooley-Tukey FFT algorithms

关键词： signal processing algorithms Arithmetic Discrete Fourier transforms Hardware Algorithm design and analysis Fast Fourier transforms Software algorithms Table lookup Counting circuits Hydrogen

来源：评论

学校读者我要写书评

暂无评论

A Reconfigurable FPGA-based 16-Channel Front-End for MRI

A Reconfigurable FPGA-based 16-Channel Front-End for MRI

引用

Asilomar Conference on signals, Systems & computers

作者： Ishaan L. Dalal Fred L. Fontaine Center for Signal Processing Communications and Computer Engineering Research Department of Electrical Engineering Cooper Union NY USA

Parallel MRI acquisitions are generally reconstructed off-line on PCs and computer clusters. Building upon an existing multichannel digital receiver, we present an innovative single-FPGA front-end that performs real-time 2D-FFT reconstruction from arrays of up to 16 coils. Partial reconfiguration enables rapid switching of FPGA modules for maximal flexibility and lower hardware cost. After an acquisition has been buffered, more complicated parallel MRI reconstruction techniques can replace receiver logic. Alternatively, the front- end can be used as a hardware-accelerated reconstruction engine with other receivers or for PCs. As proof-of-concept for real-time non-cartesian reconstruction, a reconfigurable module for next- neighbor regridding of spiral MRI is also demonstrated.

关键词： Magnetic resonance imaging Personal communication networks Concurrent computing Coils Field programmable gate arrays Hardware Costs Reconfigurable logic Engines Spirals

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：