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共 177 条记录，以下是31-40 订阅

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Wave propagation with dispersion and damping

Wave propagation with dispersion and damping

引用

conference on advanced signal processing algorithms, architectures, and implementations XIV

作者： Cohen, L CUNY New York NY 10021 USA

ISBN: (纸本)0819454974

We discuss pulse propagation in a dispersive medium with damping. We derive an explicit expression for the center of mass motion and show that when there is damping the center of mass does not travel with constant velocity, as is the case when there is no damping. We also derive an explicit relation connecting pulse propagation in the damped case with that of the undamped case. This allows the transformation from one case to the other. A number of exactly solvable examples are given to illustrate the equations derived.

关键词： Wave propagation Dispersion Fourier transforms Differential equations signal attenuation signal processing

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Scale-cumulant domain deconvolution of sensor array signals

Scale-cumulant domain deconvolution of sensor array signals

引用

conference on advanced signal processing algorithms, architectures, and implementations X

作者： Izzetolu, M Akgül, T Drexel Univ Dept Elect & Comp Engn Philadelphia PA 19104 USA

ISBN: (纸本)0819437611

In this paper we combine two recently developed multi-scale deconvolution algorithms, known as the scale-time domain method and the sum-of-cumulants domain method. We formulate the deconvolution problem in the scale-cumulant domain using the Scale Transform (ST) and show that the procedure is simpler when the unknown source signal is non-minimum phase and robust if Gaussian noise exists.

关键词： Sensors Deconvolution Electronic filtering Interference (communication) Algorithm development Reflectors signal processing Convolution Detection theory Image processing

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Neural model-based motion estimation

Neural model-based motion estimation

引用

conference on advanced signal processing - algorithms, architectures, and implementations VII

作者： Szostakowski, J Skoneczny, S Iwanowski, M Warsaw Univ. of Technology (Poland)

ISBN: (纸本)0819425842

In this paper a novel method of estimating displacement of moving objects from one frame to the next in the image sequence is presented. This method is based on using the artificial neural networks for different models of motion. The two model is examined: affine flow and planar surface motion. Various circuit architectures of simple neuron-like processors are considered for estimation of motion parameters. The efficiency of the proposed networks are investigated by computer simulation for using in video processing.

关键词： image processing neural networks video processing motion estimation

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Time-frequency analysis of a motor-generator 6

Time-frequency analysis of a motor-generator

引用

conference on advanced signal processing algorithms, architectures, and implementations VI

作者： Rohrbaugh, R USN CTR SURFACE WARFAREADV SIGNAL PROC BRANCHBREMERTONWA 98314

Time-frequency methods are applied for bearing analysis of a motor-generator. We show that these methods reveal features that are not seen by traditional methods, such as the power spectrum. These features may be used... 详细信息

ISBN: (纸本)0819422347

关键词： Time-frequency analysis Modulation Amplitude modulation Manufacturing Analytical research Corrosion Data modeling Quantum wells signal processing Warfare

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What are the time-frequency moments of a signal?

What are the time-frequency moments of a signal?

引用

conference on advanced signal processing algorithms, architectures, and implementations XI

作者： Loughlin, PJ Univ Pittsburgh Dept Elect Engn Pittsburgh PA 15261 USA

ISBN: (纸本)0819441880

We review, recent work on defining the time-frequency moments of a signal. Expressions are given for moments dropt(m)drop(omega), and of all orders n, m, in terms of the amplitude and phase of the signal and spectrum. Knowing the time-frequency moments is of interest for a variety of reasons. including their potential utility as features for classification of nonstationary signals, and also because from the moments one call construct the time-varying spectral density, or approximate it using a few moments.

关键词： instantaneous frequency instantaneous bandwidth skew kurtosis moments spectral analysis

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FPOP: Field Programmable On-line oPerators

FPOP: Field Programmable On-line oPerators

引用

conference on advanced signal processing algorithms, architectures, and implementations IX

作者： Tisserand, A Marchal, P Piguet, C CSEM Neuchatel Switzerland

ISBN: (纸本)0819432938

This paper describes a new digital reprogrammable architecture called Field Programmable On-line oPerators (FPOP). This architecture is a kind of FPGA dedicated to very low-power implementations of numerical algorithms in signal processing or digital control applications for embedded or portable systems. FPOP is based on a reprogrammable array of on-line arithmetic operators. On-line arithmetic is a digit-serial arithmetic with most significant digits first using a redundant number system. Because of the small size of the digit-serial operators and the small number of communication wires between the operators, single chip implementation of complex numerical algorithms can be achieved using on-line arithmetic. Furthermore, the digit-level pipeline and the small size of the arithmetic operators lead to high-performance parallel computations. Compared to a standard FPGA, the basic cells in FPOP are arithmetic operators such as adders, subtracters, multipliers, dividers, square-rooters, sine or cosine operators. This granularity level allows very efficient power x delay implementations of most algorithms used in digital control and signal processing. The circuit also integrates some analog to digital and digital to analog converters.

关键词： FPGA reconfigurable logic on-line arithmetic digital control signal processing

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Phase-space approach to wave propagation with dispersion and damping

Phase-space approach to wave propagation with dispersion and...

引用

conference on advanced signal processing algorithms, architectures, and implementations XIV

作者： Loughlin, P Cohen, L Univ Pittsburgh Pittsburgh PA 15261 USA

ISBN: (纸本)0819454974

We consider dispersive propagation with damping in phase-space, and derive the Wigner distribution in terms of the initial wave and the dispersion relation. The case for no damping. that is. lossless propagation, has been previously considered by Cohen, and is a special case of the more general result presented here. Simple and physically revealing approximations of the Wigner distribution in terms of the initial Wigner distribution are presented. Also. exact low-order conditional moments are given and their interpretation is discussed.

关键词： Wave propagation Dispersion Fourier transforms Time-frequency analysis Astatine signal attenuation Spatial frequencies Partial differential equations signal processing Waveguides

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The process phantom - a tool for searching for chirps

The process phantom - a tool for searching for chirps

引用

SPIE conference on advanced signal processing algorithms, architectures, and implementations VIII

作者： Hershey, JE Gen Elect Corp Res & Dev Ctr Niskayuna NY 12309 USA

ISBN: (纸本)0819429163

Searching for wideband short duration chirps is an important issue in spectrum surveillance. We propose a method and apparatus, inspired by optical tomography, by which a one-dimensional signal is converted to a two-dimensional image. This image has the remarkable property that it may disclose discernible structure. A chirp in additive white Gaussian noise, even undersampled, may be detected. The process is inherently linear and may be easily implemented by parallel processing or through the construction of an optoelectronic device.

关键词： signal recognition spectrum surveillance phantom back projection chirps display

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Proceedings of SPIE: advanced signal processing algorithms, architectures, and implementations XII

Proceedings of SPIE: Advanced Signal Processing Algorithms, ...

引用

advanced signal processing algorithms, architectures, and implementations XII

This Volume 4791 of the conference proceedings contains 47 papers. Topics discussed include advanced signal processing algorithms, architectures, time-scale analysis, time-frequency analysis, real-time implementations, structured matrices, regularization techniques, image processing, wireless communication, array processing, and high-performance arithmetic for real-time applications.

关键词： algorithms

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Generalized reaction-diffusion equation for image processing

Generalized reaction-diffusion equation for image processing

引用

conference on advanced signal processing algorithms, architectures, and implementations IX

作者： Wei, GW Natl Univ Singapore Dept Computat Sci Singapore Singapore

ISBN: (纸本)0819432938

This paper presents a robust algorithm for image processing using generalized reaction-diffusion equations. An edge enhancing functional is proposed for image enhancement. A number of super diffusion operators is introduced for fast and effective smoothing. Statistical information is utilized for robust edge-stopping and diffusion rate estimation. A unification of computational methods is discussed. The unified computational method is employed for the numerical integration of the generalized reaction-diffusion equations. Computer experiments indicate that the present algorithm is very efficient for edge-detecting and noise-removing.

关键词： image processing generalized reaction-diffusion equations unified computational method

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