检索结果-内蒙古大学图书馆

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

作者： M. Kahrs Digital Signal Processing Center Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA

Simple analog functions such as mixing and editing often have complex implementations in the digital domain. Previous machines designed expressly for such tasks, such as the Lucasfilm ASP and Neve BBC machine, are heavily pipelined and complex machines with extremely fast cycle times. The author describes the hardware architecture of a MIMD (multi-instruction/multiple-data-stream) multiprocessor designed to handle the problems of high-quality digital audio mixing, synthesis, and editing.< >

关键词： Digital signal processing Switches Communication switching Hardware Prototypes Telephony computer architecture Application specific processors signal processing algorithms Delay

来源：评论

学校读者我要写书评

暂无评论

Polyphase FIR filters for the demodulation of chrominance signals

Polyphase FIR filters for the demodulation of chrominance si...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： C.H. Lu Center of Communications and Signal Processing Research Department of Electrical Engineering New Jersey Institute of Technology Newark NJ USA

The author presents a scheme and its polyphase FIR (finite-impulse-response) filter implementation for the demodulation of chrominance signal into in-phase and quadrature-phase components. The scheme applies to any system whose sampling frequency is related to the color subcarrier frequency by a rational factor. The authors presents the criteria for choosing a sampling frequency for the digitization of a TV studio signal and addresses the issue of digital demodulation of the chrominance component in a composite video signal.< >

关键词： Finite impulse response filter Demodulation signal processing Frequency Video compression TV Digital signal processing Video signal processing Image storage Buffer storage

来源：评论

学校读者我要写书评

暂无评论

A frequency domain inverse solution in electrocardiography

A frequency domain inverse solution in electrocardiography

引用

Annual Northeast Bioengineering Conference

作者： D.H. Brooks C.L. Nikias J.H. Siegel Department of Electrical and Computer Engineering Communications and Digital Signal Processing Center Northeastern University Boston MA USA MIEMSS University of Maryland Baltimore MD USA

Recent advances in the development of detection schemes for myocardial ischemia which use frequency-domain parameters as detection statistics open up the possibility of using frequency-domain methods in the inverse problem of electrocardiography. The application of the minimum relative entropy (MRE) reconstruction principle to this problem is considered and its theoretical justification is given. The MRE method is compared to a standard time-domain least-squares method, constrained least squares (CLS). Initial results indicate that the MRE method promises to be able to overcome limitations of the time-domain least-squares methods which tend to make the latter difficult to apply in a clinical setting.< >

关键词： Frequency domain analysis Electrocardiography Inverse problems Torso Least squares methods Heart Humans Solid modeling Animals Anatomy

来源：评论

学校读者我要写书评

暂无评论

Optimal Design Of Pulse Shapes By Means Of Constrained Criteria

Optimal Design Of Pulse Shapes By Means Of Constrained Crite...

引用

Asilomar Conference on signals, Systems & computers

作者： R.A. Nobakht M.R. Civanlar S.H. Ardalan Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA AT and T Bell Laboratories Inc. Middletown NJ USA

A primary concern in the early days of pulse shaping was the construction of an analog circuit to generate the optimal pulse shape, and this has been a limiting constraint. With the recent developments in the DSP hardware, however, it is possible to use almost any pulse shape for digital data transmission. This resulted in a search for design algorithms capable of constructing pulse shapes matching to the properties of a given channel. Such properties can be translated to certain constrained criteria in the design of pulse shapes. The projection onto convex sets technique is suitable for the solution of this problem particularly because of its flexibility in modeling a variety of constraints. The use of the technique for the optimal pulse design problem is demonstrated through a detailed example from power line communications.

关键词： Pulse shaping methods Shape Finite impulse response filter signal processing algorithms Pulse circuits Digital signal processing Hardware Intersymbol interference Constraint optimization IIR filters

来源：评论

学校读者我要写书评

暂无评论

Optimal pulse shape design using projections onto convex sets

Optimal pulse shape design using projections onto convex set...

引用

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

作者： M.R. Civanlar R.A. Nobakht AT and T Bell Laboratories Inc. Middletown NJ USA Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

Recent development in digital signal processing (DSP) hardware has made it possible to use almost any pulse shape for digital data transmission, resulting in a search for design algorithms capable of constructing pulse shapes matching the properties of a given channel. The technique of projection onto convex sets is particularly suitable for the solution of this problem because of its flexibility in modeling a variety of constraints. The use of the technique for the optimal pulse design problem is demonstrated through by an example from power line communications.< >

关键词： Pulse shaping methods Shape Digital signal processing Finite impulse response filter signal processing algorithms Hardware Pulse generation IIR filters Data communication Power line communications

来源：评论

学校读者我要写书评

暂无评论

Harmonic decomposition methods in cumulant domains (array processing)

Harmonic decomposition methods in cumulant domains (array pr...

引用

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

作者： R. Pan C.L. Nikias Communications and Digital Signal Processing Center for Research and Graduate Studies Department of Electrical Engineering Northeastern University Boston MA USA Communications and Space Sciences Laboratory Department of Electrical Engineering Northeastern University Boston MA USA

The authors address the bearing estimation problem of sources from array data (snapshots) in the presence of Gaussian color (spatially correlated) noises of unknown autocorrelation matrix. They demonstrate that the harmonic decomposition methods (signal and noise subspace) can easily be reformulated using fourth-order cumulant matrices instead of autocorrelations. Simulation results are presented and comparisons are made to show that the performance of the fourth-order cumulant-based methods (beamforming, MUSIC) is superior to that of their equivalent autocorrelation-based methods when the additive noise sources are colored Gaussian with unknown correlation matrix.< >

关键词： Array signal processing Sensor arrays Autocorrelation Colored noise Matrix decomposition Additive noise Gaussian noise Direction of arrival estimation Multiple signal classification Phased arrays

来源：评论

学校读者我要写书评

暂无评论

Adaptive antenna arrays using eigenvector methods

Adaptive antenna arrays using eigenvector methods

引用

Antennas and Propagation Society International Symposium

作者： A. Haimovich Y. Bar-Ness Dept. of Electr. Eng. New Jersey Inst. of Technol. Newark NJ USA Center for Communications and Signal Processing Research Electrical Engineering Department New Jersey Institute of Technology Newark NJ USA

The authors consider the application of eigenvector techniques to the solution of interference problems. The conventional minimum-variance signal-to-noise-ratio criteria are extended to a case in which the eigenstructure of the array correlation matrix is used to cancel directional interference sources. It is shown that while the method has good interference cancellation properties, it results in higher pattern distortion than conventional arrays.< >

关键词： Adaptive arrays Antenna arrays Interference cancellation signal to noise ratio Background noise Noise cancellation Sensor arrays Adaptive signal processing Array signal processing signal synthesis

来源：评论

学校读者我要写书评

暂无评论

AN ANALYSIS OF NONLINEAR BEHAVIOR IN DELTA-SIGMA MODULATORS

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS 1987年第6期34卷 593-603页

作者： ARDALAN, SH PAULOS, JJ Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

This paper introduces a new method of analysis for deltasigma modulators based on modeling the nonlinear quantizer with a linearized gain, obtained by minimizing a mean-square-error criterion [7], followed by an additive noise source representing distortion components. In the paper, input signal amplitude dependencies of delta-sigma modulator stability and signal-to-noise ratio are analyzed. It is shown that due to the nonlinearity of the quantizer, the signal-to-noise ratio of the modulator may decrease as the input amplitude increases prior to saturation. Also, a stable third-order delta-sigma modulator may become unstable by increasing the input amplitude beyond a certain threshold. Both of these phenomena are explained by the nonlinear analysis of this paper. The analysis is carried out for both dc and sinusoidal excitations.

关键词： Delta modulation signal to noise ratio Amplitude modulation Nonlinear distortion Delta-sigma modulation Quantization Circuits signal processing Feedback Additive noise

来源：评论

学校读者我要写书评

暂无评论

FIXED-POINT ROUNDOFF ERROR ANALYSIS OF THE EXPONENTIALLY WINDOWED RLS ALGORITHM FOR TIME-VARYING SYSTEMS

引用

IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND signal processing 1987年第6期35卷 770-783页

作者： ARDALAN, SH ALEXANDER, ST Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

A fixed-point roundoff error analysis of the exponentially windowed RLS algorithm is presented. It is shown that a tradeoff exists in the choice of the forgetting factor λ. In order to reduce the sensitivity of the algorithm to additive noise, λ must be chosen close to one. On the other hand, the roundoff error increases as \lambda \rightarrow 1 . It is shown that the algorithm is stabilized with λ < 1. The algorithm may diverge for \lambda \rightarrow 1 . To derive the theoretical results, it is assumed that the input signal is a white Gaussian random process. Finally, simulations are presented which confirm the theoretical findings of the paper.

关键词： Roundoff errors Error analysis Algorithm design and analysis Resonance light scattering Time varying systems signal processing algorithms Kalman filters Additive noise Noise reduction signal processing

来源：评论

学校读者我要写书评

暂无评论

ANALYSIS OF DISTRIBUTION LINE CARRIER PROPAGATION USING THE BUS IMPEDANCE MATRIX

引用

IEEE TRANSACTIONS ON POWER DELIVERY 1987年第4期2卷 976-984页

作者： AMOURA, FK ONEAL, JB Center for Communications and Signal Processing Electrical and Computer Engineering Department North Carolina State University Raleigh NC USA

Distribution line carrier (DLC) is a communication system used in automated distribution systems to transmit data between the substation and certain locations on the distribution primary and secondary. Extensive DLC propagation measurements have shown that the propagation of signals on a power distribution line is difficult to predict because of the complexity and variability of distribution systems. This paper presents an efficient and comprehensive analytical tool for predicting DLC signal propagation over complex distribution systems. This paper develops a three-phase bus impedance matrix, which consists of 3×3 transfer impedance submatrices. These submatrices represent the general transfer function which relates the three-phase received voltage vector at any point of interest to any three-phase transmitted (injected) current vector at any point of interest. The method described here is an extension of the three-phase bus impedance approach used for 60 Hz power distribution.

关键词： Impedance Voltage Transfer functions Transmitters Power measurement signal analysis Frequency signal processing Distributed computing Data engineering

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：