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检索条件"任意字段=Advanced Signal Processing Algorithms, Architectures, and Implementations XVII"

共 419 条记录，以下是381-390 订阅

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INSTANTANEOUS FREQUENCY AND KERNEL REQUIREMENTS FOR DISCRETE TIME-FREQUENCY DISTRIBUTIONS

INSTANTANEOUS FREQUENCY AND KERNEL REQUIREMENTS FOR DISCRETE...

引用

CONF ON advanced signal-processing algorithms, architectures, AND implementations

作者： JEONG, JH CUNNINGHAM, GS WILLIAMS, WJ Univ. of Michigan (United States)

ISBN: (纸本)0819404098

In this paper we introduce a new definition for the instantaneous frequency of a discrete-time analytic signal. Unlike the existing definition which uses only two data samples around a particular time this method utilizes all the data samples for estimating the instantaneous frequency. We prove that this quantity is identical to the average frequency evaluated at the particular time in the discrete-time TFD. This property is consistent with the analogous continuous-time property. We also derive requirements on the discrete-time kernel needed to satisfy this property. Using computer-generated signals and real data performance comparisons are made between the proposed approach and the existing one.

关键词： Time-frequency analysis Data analysis signal analyzers Statistical analysis

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RECURSIVE LEAST-SQUARES LEARNING algorithms FOR NEURAL NETWORKS

RECURSIVE LEAST-SQUARES LEARNING ALGORITHMS FOR NEURAL NETWO...

引用

CONF ON advanced signal-processing algorithms, architectures, AND implementations

作者： LEWIS, PS HWANG, JN Los Alamos National Lab. (United States) Univ. of Washington (United States)

ISBN: (纸本)0819404098

This paper presents the development of a pair of recursive least squares (ItLS) algorithms for online training of multilayer perceptrons which are a class of feedforward artificial neural networks. These algorithms incorporate second order information about the training error surface in order to achieve faster learning rates than are possible using first order gradient descent algorithms such as the generalized delta rule. A least squares formulation is derived from a linearization of the training error function. Individual training pattern errors are linearized about the network parameters that were in effect when the pattern was presented. This permits the recursive solution of the least squares approximation either via conventional RLS recursions or by recursive QR decomposition-based techniques. The computational complexity of the update is 0(N2) where N is the number of network parameters. This is due to the estimation of the N x N inverse Hessian matrix. Less computationally intensive approximations of the ilLS algorithms can be easily derived by using only block diagonal elements of this matrix thereby partitioning the learning into independent sets. A simulation example is presented in which a neural network is trained to approximate a two dimensional Gaussian bump. In this example RLS training required an order of magnitude fewer iterations on average (527) than did training with the generalized delta rule (6 1 BACKGROUND Artificial neural networks (ANNs) offer an interesting and potentially useful paradigm for signal processing and pattern recognition. The majority of ANN applications employ the feed-forward multilayer perceptron (MLP) network architecture in which network parameters are " trained" by a supervised learning algorithm employing the generalized delta rule (GDIt) [1 2]. The GDR algorithm approximates a fixed step steepest descent algorithm using derivatives computed by error backpropagatiori. The GDII algorithm is sometimes referred to as the

关键词： Algorithm development Detection and tracking algorithms Evolutionary algorithms Neural networks Network architectures Artificial neural networks Pattern recognition Chemical elements Machine learning signal processing

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WAVELETS, TOMOGRAPHY, AND LINE SEGMENT IMAGE REPRESENTATIONS

WAVELETS, TOMOGRAPHY, AND LINE SEGMENT IMAGE REPRESENTATIONS

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CONF ON advanced signal-processing algorithms, architectures, AND implementations

作者： ALTES, RA Chirp Corp. (United States)

ISBN: (纸本)0819404098

Conventional scale dependent wavelet analysis represents a signal or iniage as a superposition of translated differently scaled versions of the same basis function. When the basis function for time series analysis is a chirp with linear frequency modulation a scale dependent wavelet representation is equivalent to a sequence of projections of the signal timefrequency distribution along differently rotated lines and reconstruction of the signal from its chirped wavelet representation is analogous to tomographic reconstruction from time frequency projections. The same analogy applies in two dimensions if scaled basis functions are replaced by rotated ones such that an image is represented by a superposition of translated differently rotated versions of the same basis function. For rotation dependent wavelet analysis basis functions consisting of very long line segments yield a tomographic representation while shorter line segments yield a line segment image representation as in the primate visual cortex. Applications include binocular robot vision and synthetic aperture radar.

关键词： Wavelets Tomography Image segmentation Superposition Frequency modulation Robot vision signal analyzers Synthetic aperture radar Time series analysis Visual cortex

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TRUNCATED SAMPLING FOR THE FOURIER-MELLIN TRANSFORM WITH APPLICATIONS TO WIDE-BAND WVD COMPUTATION

TRUNCATED SAMPLING FOR THE FOURIER-MELLIN TRANSFORM WITH APP...

引用

CONF ON advanced signal-processing algorithms, architectures, AND implementations

作者： ALLEN, JC Naval Ocean Systems Ctr. (United States)

ISBN: (纸本)0819404098

The Fourier-Mellin transform (FMT) of an input function is defined as and is the magnitude squared of the Mellin transform of the magnitude squared of the Fourier transform of the input function [1]. As such the FMT is unchanged by translations and dilations of the input function. While the FMT has found applications in optical pattern recognition [3] [5] ship classification by sonar and radar [15] and image processing [10] only cursory attention has been paid to the truncation error incurred by using a finite number of samples of the input function. This paper establishes truncation bounds for computing the FMT for band-limited functions from a finite number of samples of the input function. These bounds naturally suggest an implementation of the FMT by the method of direct expansions [4] [14]. This approach readily generalizes to a direct expansion for the Wigner-Ville distribution [13] and the Q distribution [2]. 1 Principal Notation u(x) fff00 e_2tu(t)dt Fourier transform of u M(u s) fD X_i2r8() Mellin transform of u . FM(u s) M(lI(x)I2 s)________ Fourier-Mellin transform of u Q(U V f002rt U(wft)_V(w/fr) Q distribution of U and V W(U V t w) fe_i2ntY U(w + y/2) V(w y/2) dy Wigner-Ville distribution of U and V

关键词： Fourier transforms Error analysis Image classification Image processing Optical pattern recognition Radar

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Multiscale signal detection in fractional brownian motion

Multiscale signal detection in fractional brownian motion

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advanced signal processing algorithms, architectures, and implementations 1990

作者： Tewfik, A.H. Kim, M. Dept. of Electrical Engineering University of Minnesota Room 4-178 EE/CSci. Bldg. MinneapolisMN55455 United States

A multiresolution model of a discrete fractional Brownian motion is developed. The model leads to a multiscale algorithm for constructing the optimal filter that must be used in detection problems involving a fraction... 详细信息

关键词： White noise

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CORDIC algorithms in four dimensions

CORDIC algorithms in four dimensions

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advanced signal-processing algorithms, architectures, and implementations

作者： Delosme, Jean-Marc Hsiao, Shen-Fu Yale Univ New Haven United States

CORDIC algorithms offer an attractive alternative to multiply-and-add based algorithms for the implementation of two-dimensional rotations, preserving either norm: (x2 + y2) 1/2 or (x2 - y2) 1/2 . Indeed these nor whose computation is a significant part of the evaluation of the two-dimensional rotations, are computed much more easily by the CORDIC algorithms. However the part played by norm computations in the evaluation of rotations becomes quickly small as the dimension of the space increases. Thus, in spaces of dimension 5 or more, there is no practical alternative to multiply-and-add based algorithms. In the intermediate region, dimensions 3 and 4, extensions of the CORDIC algorithms are an interesting option. The four-dimensional extensions are particularly elegant and are the main object of this paper.

关键词： signal processing

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Algorithm for the singular value decomposition of a matrix product

Algorithm for the singular value decomposition of a matrix p...

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advanced signal-processing algorithms, architectures, and implementations

作者： Bojanczyk, Adam W. Ewerbring, L.Magnus Luk, Franklin T. Van Dooren, Paul Cornell Univ Ithaca United States

In this paper, we propose a new algorithm for computing a singular value decomposition of a matrix product. We show that our algorithm is numerically desirable in that all relevant residual elements will be numericall... 详细信息

关键词： signal processing

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Efficient beam-based adaptive processing for planar arrays

Efficient beam-based adaptive processing for planar arrays

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advanced signal-processing algorithms, architectures, and implementations

作者： Kratzer, Steven G. Supercomputing Research Cent Bowie United States

Beam-based adaptive processing is an economical way to achieve good interference rejection performance from an adaptive receiving array, at much less computational cost than full element-based methods. However, to exploit this potential for planar arrays it is necessary to identify, in real time, which beams must be retained for adaptive cancellation. This paper analyzes the beam-selection problem and presents a computationally efficient algorithm that performs real-time beam selection.

关键词： signal Filtering and Prediction

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Tomographic techniques in image and signal processing

Tomographic techniques in image and signal processing

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advanced signal-processing algorithms, architectures, and implementations

作者： Snyder, Donald L. Washington Univ St. Louis United States

An iterative solution is given for solving deblurring problems having nonnegativity constraints through the use of methods motivated by tomographic imaging. After briefly reviewing three versions of tomographic-imaging problems, the paper indicates how methods that have proven to be powerful for the third version, weighted-integral tomography, can be applied to the more general deblurring problem when nonnegativity constraints are present.

关键词： signal processing

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Radar signal synthesis with constraints - A group theoretic approach

Radar signal synthesis with constraints - A group theoretic ...

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advanced signal processing algorithms, architectures, and implementations 1990

作者： White, Langford B. Electronics Research Laboratory Defence Science and Technology Organisation PO Box 1600 SalisburySA5108 Australia

This paper addresses the problem of designing signals for general group representations subject to constraints which are formulated as convex sets in the Hubert space of the group states. In particular, the paper considers irreducible representations in an infinite dimensional Hubert space and derives an iterative procedure for proceeding from an arbitrary element of the Hubert space to a state of the group subject to a priori imposed constraints with closed convex range. As examples, the paper focusses on narrowband and wideband radar ambiguity synthesis. © 1990 SPIE. All rights reserved.

关键词： Group theory

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