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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： T. Ogunfunmi Nam Ling Signal and Image Processing Laboratory (SIPL) Department of Electrical Engineering Santa Clara University Santa Clara CA USA Computer Systems and Parallel Processing Research Laboratory (CSPPRL) Department of Computer Engineering Santa Clara University Santa Clara CA USA

For real-time radar processing, it is very desirable to have an algorithm that does not assume restricted statistics of the input data and can be implemented for high-speed processing (without a high cost) to meet real-time requirements. We therefore apply the QR decomposition-based least-squares method for linear prediction to the problem of computing the reflection coefficients of a lattice predictor, instead of using the conventional Burg algorithm. We also propose a modified one-dimensional ring architecture for implementing the QR method of least-squares. The particular application considered in this case is that of surveillance radar systems for air traffic control.< >

关键词： Least squares methods Air traffic control Radar applications signal processing algorithms Radar signal processing Statistics Systolic arrays Radar imaging signal processing Surveillance

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Helicopter gearbox fault detection and diagnosis using analog neural networks

Helicopter gearbox fault detection and diagnosis using analo...

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Asilomar Conference on signals, Systems & computers

作者： P.T. Monsen E.S. Manolakos M. Dzwonczyk Atlantic Aerospace Electronics Corporation Waltham MA USA Communications and Digital Signal Processing Center Electrical And Computer Engineering Department Northeastern University Boston MA USA Information Systems Laboratory Department of Electrical Engineering University of Stanford USA

This paper summarizes the results of two neural hardware implementations of a helicopter gearbox health monitoring system (HMS). Our first hybrid approach and implementation to fault diagnosis is outlined, and our results are summarized using three levels of fault characterization: fault detection (fault or no fault), classification (gear or bearing fault), and identification (fault sub-classes). Our second all-analog implementation exploits the ability, of analog neural hardware to compute the discrete Fourier transform (DFT) as a pre-processor to a neural classifier. Our hardware results compare well with previously published software simulations.< >

关键词： Helicopters Fault detection Fault diagnosis Hardware Discrete Fourier transforms Monitoring Gears Analog computers Computational modeling

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Limit cycles in floating-point implementations of recursive filters - A review

Limit cycles in floating-point implementations of recursive ...

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1992 IEEE International Symposium on Circuits and Systems, ISCAS 1992

作者： Laakso, Timo I. Zeng, Bing Helsinki University of Technology Laboratory of Signal Processing and Computer Technology EspooSF-02150 Finland University of Toronto Department of Electrical Engineering TorontoONM5S 1A4 Canada

ISBN: (纸本)0780305930

In this paper, results on limit cycle oscillations in floating-point implementations of recursive filters are reviewed. Special attention is paid to structures with a single floating-point nonlinearity in the recursive filter loop, for which efficient criteria have heenproposedto guarantee the absence of limit cycles. Both unlimited exponent range limit cycles and underflow limit cycles are considered. Also results on wave digital fillers and related structures are discussed. © 2012 IEEE.

关键词： Digital arithmetic

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multiple Branch FIR Filters for Sampling Rate Conversion

Multiple Branch FIR Filters for Sampling Rate Conversion

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1992 IEEE International Symposium on Circuits and Systems, ISCAS 1992

作者： Saramäki, Tapio Mitra, Sanjit K. Signal Processing Laboratory Tampere University of Technology P. O. Box 527 TampereSF-33101 Finland Department of Electrical and Computer Engineering University of California Santa BarbaraCA93106 United States

ISBN: (纸本)0780305930

A class of linear-phase finite impulse response (FIR) digital filters for sampling rate conversion is introduced. These filters consist of two cascaded parts. The first part is a parallel connection of two or three branches with transfer function of the form Ak (z)Bk (zD), where D is the sampling rate conversion ratio. The second part has the transfer function of the form C(zD). The main advantage of these designs is that they provide a significant reduction in the multiplication and addition rates as well as in the number of required multipliers over the equivalent conventional direct-form designs also in cases where D is a prime number. In these cases, the sampling rate conversion cannot be performed in several stages and and many of the other existing designs lose their advantages. Special multiplier-free solutions are generated for implemeting the filters Ak (z), resulting in dramatic savings. Several examples are included showing the efficiency of the proposed filters compared to other existing designs. © 1992 IEEE.

关键词： Transfer functions

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A new robust approach to diffuse edge detection

A new robust approach to diffuse edge detection

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MILCOM, Military Communications Conference

作者： T.-H. Yu S.K. Mitra Department of Electrical and Computer Engineering Signal and Image Processing Laboratory University of California Santa Barbara CA USA

The authors outline an edge-prediction-adjustment strategy for the detection of diffused edges using an image pyramid structure. An initial edge map is obtained from an appropriate high-level image of the pyramid using a conventional edge detection method. Next, using a simple linear interpolation, the predicted edge map for the adjacent low-level image is determined. Based on the information of the predicted edges, edge adjustment is carried out using a sequential search in a small neighborhood of each of the predicted edges with the aid of a dynamic programming based method. Simulation results on both synthetic and medical images indicate that the performance of the proposed approach is much better than that of the commonly used differential of a Gaussian-based approach.< >

关键词： Robustness Image edge detection Band pass filters Smoothing methods Shape Interpolation Gradient methods Laplace equations signal processing Image processing

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Limit cycles in floating-point implementations of recursive filters-a review

Limit cycles in floating-point implementations of recursive ...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T.I. Laakso B. Zeng Laboratory of Signal Processing and Computer Technology Helsinki University of Technology Espoo Finland Department of Electrical Engineering University of Toronto Toronto ONT Canada

Results on limit cycle oscillations in floating-point implementations of recursive filters are reviewed. Special attention is paid to structures with a single floating-point nonlinearity in the recursive filter loop, for which efficient criteria are proposed to guarantee the absence of limit cycles. Both unlimited exponent range limit cycles and underflow limit cycles are considered. Also results on wave digital filters and related structures are discussed.< >

关键词： Limit-cycles Quantization Laboratories signal processing Digital filters Feedback loop Information analysis Information filtering Information filters Hardware

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multiple branch FIR filters for sampling rate conversion

Multiple branch FIR filters for sampling rate conversion

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T. Saramaki S.K. Mitra Signal Processing Laboratory Tampere University of Technology Tampere Finland Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

A class of linear-phase finite impulse response (FIR) digital filters for sampling rate conversion is introduced. These filters consist of two cascaded parts. The first part is a parallel connection of two or three branches with transfer function of the form A/sub k/(z)B/sub k/) (z/sup D/), where D is the sampling rate conversion ratio. The second part has a transfer function of the form C(z/sup D/). The advantage of these designs is that they provide a significant reduction in the multiplication and addition rates as well as in the number of required multipliers over the equivalent conventional direct-form designs also in cases where D is a prime number. In these cases, the sampling rate conversion cannot be performed in several stages and many of the other existing designs lose their advantages. Special multiplier-free solutions are generated for implementing the filters A/sub k/(z), resulting in dramatic savings. Several examples are included showing the efficiency of the proposed filters compared to other existing designs.< >

关键词： Finite impulse response filter Sampling methods Delay Passband Niobium USA Councils Baseband Shape Transfer functions Interpolation

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IMAGE SEQUENCE CODING BY SPLIT AND MERGE

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IEEE TRANSACTIONS ON COMMUNICATIONS 1991年第12期39卷 1845-1855页

作者： WILLEMIN, P REED, TR KUNT, M Signal and Image Processing Laboratory Swiss Federal Institute of Technology Lausanne Switzerland Department of Electrical Engineering and Computer Science University of California Davis CA USA

This paper describes a method for reducing the information contained in an image sequence, while retaining the information necessary for the interpretation of the sequence by a human observer. The method consists of first locating the redundant information, reducing the degree of redundancy, and coding the result. The sequence is treated as a single 3-D data volume, the voxels of which are grouped into several regions, obtained by a 3-D split and merge algorithm. To find these regions, we first obtain an initial region space by splitting the image sequence until the gray-level variation over each region can be approximated by a 3-D polynomial, to a specified accuracy. This results in a set of parallelepipedic regions of various sizes. To represent the gray-level variation over these regions, the coefficients of the approximating polynomial are used as features. The most similar regions are then merged, using a region adjacency graph. The information is coded by representing the borders of the regions using a pyramidal structure in the x, y, t space. The coefficients of the approximating polynomials are coded in a straightforward manner. For 256 x 256 pixel, 25 frames/s image sequences, compressions allowing transmission rates near 64 kbit/s are obtained.

关键词： Image sequences Image coding Pixel Bandwidth Layout Polynomials Image segmentation Humans Helium ISDN

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A NEW APPROACH TO IMAGE-CODING USING 1-D SUBBAND FILTERING 2

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CONF ON IMAGE processing ALGORITHMS AND TECHNIQUES

作者： YU, TH MITRA, SK Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara 93106 CA United States

ISBN: (纸本)0819405515

Conventional subband coding for image data compression uses two-dimensional (2-D) separable QMF banks in which the analysis and synthesis filters are composed of 1-D filters. Such an implementation produces a large size output image as a result of the convolution process. Various signal extension methods have been proposed to solve this problem. However, these methods have one or more of the following drawbacks: Generation of boundary noise, inability to guarantee aliasing cancellation, and increased computational complexity. In this paper, we present an alternative solution to the problem by converting a 2-D image array to a 1-D array and then using an 1-D QMF bank to process the 1-D signal. In our approach, most of the above drawbacks mentioned above are eliminated. In addition, our approach offers more flexibilities in the type of the filter that can be implementated. © 1991 SPIE. All rights reserved.

关键词： Image coding

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DEGREES OF CYCLOSTATIONARITY AND THEIR APPLICATION TO signal-DETECTION AND ESTIMATION

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signal processing 1991年第3期22卷 287-297页

作者： ZIVANOVIC, GD GARDNER, WA Computer Systems Design Laboratory “Boris Kidrič” Institute Vinča P.O. Box 522 11001 Belgrade Yugoslavia Signal Processing Group Department of Electrical Engineering & Computer Science University of California Davis CA 95616 USA

The problem of defining an appropriate measure of the degree of nonstationarity for stochastic processes that exhibit cyclostationarity is addressed. After discussing several candidate measures of degree of nonstationarity, one particularly promising measure is adopted. By decomposing this measure, several component measures are arrived at. Bounds on these measures are derived and their utility in applications involving signal detection and estimation is established. Examples are presented to illustrate the calculation of degrees of nonstationarity for several types of cyclostationary signals.

关键词： CYCLOSTATIONARY PROCESS DEGREE OF CYCLOSTATIONARITY INSTANTANEOUS SPECTRUM SPECTRAL CORRELATION

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