检索结果-内蒙古大学图书馆

Workshop on VLSI signal processing

作者： Ji-Heub Kim Lee-Sup Kim Department of Information and Communication Engineering Korea Advanced Institute of Science and Technology South Korea

Nonlinear range curvature effect and linear range walk effect appearing in collected SAR data array cause SAR image quality to be distorted. Therefore, two kinds of range cell migration (RCM) compensation processing are required in addition to the two dimensional pulse compression processes. In this paper, special purpose hardware which compensates for these linear and nonlinear cell migration effects are implemented in architecture level and logic level by using the compensation algorithm used in digital SAR processing. Pre-layout simulations using CAD tools are also carried out to verify the normal operation of the designed hardware. SAR parameters used during compensation processing are the parameters for spaceborne SEASAT SAR launched in 1978. Data block to be processed is composed of 4096 pulses/spl times/4096 samples.

关键词： Application specific integrated circuits Synthetic aperture radar signal processing algorithms Nonlinear distortion Hardware Image coding Satellites Frequency estimation Image quality Pulse compression methods

来源：评论

学校读者我要写书评

暂无评论

A new switched capacitor circuit for parallel-pixel image processing [vision sensor integrated signal processing]

A new switched capacitor circuit for parallel-pixel image pr...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： N. Massari N. Viarani M. Gottardi ITC IRST Trento Italy

A new switched capacitor (SC) circuit for image processing is presented. Optimized area occupancy and power consumption allow the integration of the proposed circuit into each pixel, in order to implement high speed pixel-parallel processing. The operation performed by the circuit consists of the accumulation of the absolute value of the difference between two voltage inputs, which is the base of a large set of image processing algorithms. Two circuit configurations have been developed and compared in this paper: a basic implementation and a second improved solution with higher sensitivity and linearity over the full output range. The improved pixel consists of 10 transistors and 3 capacitances and provides an output voltage range of 1.8 V with 3.3 V power supply. A test chip was fabricated in a 0.35 /spl mu/m double-poly triple-metal CMOS process. The resulting 35 /spl mu/m square pixel has a power consumption of 3 /spl mu/W @ 3.3 V. The single absolute difference and accumulation is executed in 2 /spl mu/s, which turns into a computing figure of 1.2 GOPS/mm/sup 2/ and 1.3 TOPS/W.

关键词： Switched capacitor circuits Image processing Capacitive sensors Image sensors signal processing Energy consumption Voltage Switching circuits signal processing algorithms Linearity

来源：评论

学校读者我要写书评

暂无评论

The nervous system modeling algorithm for signal processing and communication in intelligent networks

The nervous system modeling algorithm for signal processing ...

引用

International Conference on Advanced Technologies for signal and Image processing (ATSIP)

作者： Safae El Abkari Jamal Mhamdi Université Mohamed V Ecole Normale Supérieure de l'Enseignement Technique — Rabat Morocco

ISBN: (纸本)9781467385275

The proper acquisition and exploitation of carrying signals in an intelligent network ensure performances optimization. Especially, if the used method seeks to use existing resources and improve their uses in order to make it more effective. However, based on this concept, the design of a flexible, dynamic, and resistant network can be easily reached. This paper deals with the issue of the good exploiting and processing of signals in intelligent networks. For this, we propose an approach of an autonomous and efficient method inspired from the nervous system that enables getting signals, process it, look for failure in case of problem, find solutions for it or signalize it if it is hard to solve. Finally, we describe how to implement it to be usable in wider applications.

关键词： Spinal cord Intelligent networks Security signal processing Neurons signal processing algorithms

来源：评论

学校读者我要写书评

暂无评论

An interactive GUI-based tool for signal and speech processing courses

An interactive GUI-based tool for signal and speech processi...

引用

Frontiers in Education (FIE) Conference

作者： H. Bhagatwala E. Painter A. Spanias Department of Electrical Engineering Distance Learning Initiative TRC Arizona State University Tempe AZ USA

In this paper, the authors present interactive, graphical software for introducing speech coding in undergraduate and graduate courses on digital signal processing (DSP) and speech processing. The software facilitates students in understanding and experimentation for practical applications of signal processing concepts introduced in DSP courses. It consists of two complementary components. The first is a MATLAB-based graphical simulation of a state-of-the-art speech coder. This component of the software is designed to complement the theoretical aspects of speech coding with practical exposure to the algorithms using hands-on simulations. The second component is an application that provides a framework for evaluation of different speech coding algorithms for a variety of applications. With this tool, students can easily categorize the performance of different speech coding algorithms through objective measurements as well as subjective listening tests. These tools could be used in entry-level graduate courses in DSP and speech coding.

关键词： signal processing Speech processing Speech coding Digital signal processing signal processing algorithms Application software Computer languages Software design Algorithm design and analysis Software algorithms

来源：评论

学校读者我要写书评

暂无评论

Tracking systems for stochastic signal processing by employment of generalized algorithm

Tracking systems for stochastic signal processing by employm...

引用

International Conference on Information, Communications and signal processing

作者： V.P. Tuzlukov Institute of Engineering Cybernetics National Academy of Science of Belarus Minsk Belarus

The employment of the generalized algorithm creates a possibility to increase the noise immunity for complex detection systems of more than twice in comparison with using the optimal detection algorithms of signals with a priori known and unknown amplitude-phase structure. A comparative analysis of the detection characteristics of the optimal and generalized detectors is carried out. Investigation avenues to stabilization of the detection characteristics under employment of the generalized detector independent of the signal random parameters based on the tracking systems are proposed.

关键词： signal processing algorithms Stochastic systems Employment Detectors signal processing Frequency Noise level Bandwidth Phase noise Stochastic resonance

来源：评论

学校读者我要写书评

暂无评论

An improved algorithm for spatial spectrum estimation in array signal processing

An improved algorithm for spatial spectrum estimation in arr...

引用

International Conference on Natural Computation (ICNC)

作者： Tao Lei Rongyu Fang Zhihui Qiu Chongqing Key Lab of Mobile Communications Chongqing University of Posts and Telecommunications Chongqing China

ISBN: (纸本)9781467347129

Direction of Arrival (DOA) estimation based on array signal processing is the main content of spatial spectrum estimation. Multiple signal Classification (MUSIC) is the most classical super-resolution spatial spectrum estimation method. Under ideal condition, the algorithm can precisely estimate the DOA of uncorrelated signals. However, the performance of MUSIC algorithm will degrade seriously or even fail in the coherent source signal estimation. In the condition that many artificial signals have cyclostationary characteristics which use the target signal information, circular cross correlation MUSIC algorithm can further improve the quality of signal processing and have better noise suppressing property and resolution. But it is restricted to the cyclic correlation signal resolution. Therefore, this paper proposes an improved circular cross correlation MUSIC algorithm. Simulation results show that the performance of the improved circular cross correlation MUSIC algorithm is superior to the conventional MUSIC algorithm and circular cross correlation MUSIC algorithm in noise suppressing and signal selectivity.

关键词： Multiple signal classification signal processing algorithms Correlation Arrays Noise Direction-of-arrival estimation Estimation

来源：评论

学校读者我要写书评

暂无评论

A Provable Splitting Approach for Symmetric Nonnegative Matrix Factorization

引用

IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 2023年第3期35卷 2206-2219页

作者： Li, Xiao Zhu, Zhihui Li, Qiuwei Liu, Kai Chinese Univ Hong Kong Sch Data Sci Shenzhen 518172 Guangdong Peoples R China Shenzhen Inst Artificial Intelligence & Robot Soc Shenzhen Guangdong Peoples R China Univ Denver Dept Elect & Comp Engn Denver CO 80208 USA Alibaba Grp Damo Acad Decis Intelligence Lab Bellevue WA 98004 USA Clemson Univ Comp Sci Div Clemson SC 29634 USA

The symmetric Nonnegative Matrix Factorization (NMF), a special but important class of the general NMF, has found numerous applications in data analysis such as various clustering tasks. Unfortunately, designing fast algorithms for the symmetric NMF is not as easy as for its nonsymmetric counterpart, since the latter admits the splitting property that allows state-of-the-art alternating-type algorithms. To overcome this issue, we first split the decision variable and transform the symmetric NMF to a penalized nonsymmetric one, paving the way for designing efficient alternating-type algorithms. We then show that solving the penalized nonsymmetric reformulation returns a solution to the original symmetric NMF. Moreover, we design a family of alternating-type algorithms and show that they all admit strong convergence guarantee: the generated sequence of iterates is convergent and converges at least sublinearly to a critical point of the original symmetric NMF. Finally, we conduct experiments on both synthetic data and real image clustering to support our theoretical results and demonstrate the performance of the alternating-type algorithms.

关键词： Convergence Symmetric matrices signal processing algorithms Clustering algorithms Minimization Transforms Optimization Symmetric nonnegative matrix factorization convergence image clustering alternating minimization

来源：评论

学校读者我要写书评

暂无评论

Nonlinear maximum likelihood estimation of autoregressive time series

引用

IEEE TRANSACTIONS ON signal processing 1995年第12期43卷 2909-2919页

作者： McWhorter, LT Scharf, LL Department of Electrical and Computer Engineering University of Colorado Boulder CO USA

In this paper, we describe an algorithm for finding the exact, nonlinear, maximum likelihood (ML) estimators for the parameters of an autoregressive time series. We demonstrate that the ML normal equations can be written as an interdependent set of cubic and quadratic equations in the AR polynomial coefficients. We present an algorithm that algebraically solves this set of nonlinear equations for low-order problems. For high-order problems, we describe iterative algorithms for obtaining a ML solution.

关键词： Maximum likelihood estimation Nonlinear equations Iterative algorithms Parameter estimation Polynomials Reflection Statistics Probability Computer errors signal processing algorithms

来源：评论

学校读者我要写书评

暂无评论

Sequential Change-Point Detection for High-Dimensional and Non-Euclidean Data

引用

IEEE TRANSACTIONS ON signal processing 2022年 70卷 4498-4511页

作者： Chu, Lynna Chen, Hao Iowa State Univ Dept Stat Ames IA 50011 USA Univ Calif Davis Dept Stat Davis CA 95616 USA

In many applications, it is often of practical and scientific interest to detect anomaly events in a streaming sequence of high-dimensional or non-Euclidean observations. We study a non-parametric framework that utilizes nearest neighbor information among the observations to detect changes in an online setting. It can be applied to data in arbitrary dimension and non-Euclidean data as long as a similarity measure on the sample space can be defined. We consider new test statistics under this framework that can detect anomaly events more effectively than the existing test while keeping the false discovery rate controlled at a fixed level. Analytic formulas approximating the average run lengths of the new approaches are derived to make them fast applicable to modern datasets. Simulation studies are provided to support theoretical results. The proposed approach is illustrated with an analysis of the NYC taxi dataset.

关键词： Delays Indexes Streaming media signal processing algorithms Image edge detection Wearable sensors Surveillance Anomaly detection online change-point streaming data graph-based tests non-parametric

来源：评论

学校读者我要写书评

暂无评论

IMAGE-RECONSTRUCTION FROM PROJECTIONS UNDER WAVELET CONSTRAINTS

引用

IEEE TRANSACTIONS ON signal processing 1993年第12期41卷 3579-3584页

作者： SAHINER, B YAGLE, AE Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

First, we discuss how the wavelet transform can be used to perform spatially-varying filtering of an image, suppressing noise locally in smooth regions of the image, and we discuss detection of such regions in a noise-corrupted image. Second, we show how to compute the minimum mean-square estimate of an image given: 1) noisy projections of the image;2) statistics of additive noise in the projections;and 3) constraints on wavelet coefficients of the image. Examples illustrate the resulting procedure.

关键词： Image reconstruction Low pass filters signal to noise ratio Speech processing signal processing signal resolution signal processing algorithms Image coding Spatial resolution Filtering

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：