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

作者： J.G. Apostolopoulos P.A. Monta J.J. Nicolas J.S. Lim Advanced Television and Signal Processing Group Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Res. Lab. of Electron. MIT Cambridge MA USA

There has been significant interest in the design of a digital television system for terrestrial HDTV broadcasting. The authors discuss various issues related to the design of a HDTV system. They examine the design of a video compression system for the efficient delivery of digital television signals. A number of considerations that arise when designing the video compression system are discussed, and a sample system which meets most of these requirements is presented. It is shown that the video compression principles and system issues can be integrated into a framework for designing a high-performance digital HDTV system.< >

关键词： Video compression HDTV TV Spatial resolution Video signal processing signal design Radio frequency Channel coding lab.ratories Digital video broadcasting

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Parallel consensual neural networks

Parallel consensual neural networks

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International Conference on Neural Networks

作者： J.A. Benediktsson J.R. Sveinsson O.K. Ersoy P.H. Swain Lab. for Inf. Technol. & Singal Process. Iceland Univ. Reykjavik Iceland Laboratory for Information Technology and Signal Processing University of Iceland Reykjavik Iceland School of Electrical Engineering and Laboratory for Applications of Remote Sensing Purdue University West Lafayette IN USA

A neural network architecture is proposed and applied in classification of remote sensing/geographic data from multiple sources. The architecture is called the parallel consensual neural network, and its relation to hierarchical and ensemble neural networks is discussed. The parallel consensual neural network architecture is based on statistical consensus theory. The input data are transformed several times. The different transformed data are applied as if they were independent inputs, and are classified using stage neural networks. The outputs from the stage networks are weighted and combined to make a decision. Experimental results based on remote sensing data and geographic data are given. The performance of the consensual neural network architecture is compared to that of a two-layer (one hidden layer) conjugate-gradient backpropagation neural network. The results compare favorably in terms of classification accuracy to the backpropagation method.< >

关键词： Neural networks Remote sensing Backpropagation Statistical analysis Bayesian methods Information technology signal processing lab.ratories Intelligent networks Councils

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Interactive tools for signal processing education. The signal processing instructional facility (SPIF lab. at Washington State University

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computer Applications in Engineering Education 1993年第6期1卷 517-517页

作者： Bamberger, R.H. Signal Processing Instructional Facility School of Electrical Engineering and Computer Science Washington State University Pullman WA 99164-2752 Dr. Roberto H. Bamberger:was born on January 30 1965 in Buenos Aires Argentina. He received his B.E.E and PhD from the Georgia Institute of Technology in 1986 and 1990 respectively. Currently Dr. Bamberger is an assistant professor in the School of Electrical Engineering and Computer Science at Washington State University. Dr. Bamberger's research program is focused on the design implementation and application of multidimensional multirate filter banks subband image and video compression analysis of nonstationary data and application of digital signal processing techniques in the design of analog and mixed-mode integrated circuits. Dr. Bamberger is the founder and director of the Signal Processing Instructional Facility (SPIF Lab) at Washington State University. The SPIF Lab features interactive multimedia-based tools for teaching concepts related to linear systems theory. Dr. Bamberger is active in developing multimedia-based instructional laboratories for a variety of other topics as well. In addition to his teaching and research programs Dr. Bamberger is an associate editor for theIEEE Transactions on Signal Processingand a member of the editorial board forComputer Applications in Engineering Education. Dr. Bamberger is also advisor to the WSU Student Branch of the IEEE and assistant director of the WSU Cougar Marching Band. Dr. Bamberger is a member of Phi Eta Sigma Eta Kappa Nu Tau Beta Pi and Kappa Kappa Psi.

The signal processing Instructional Facility (SPIF lab. is an experiment in using in interactive multimedia for teaching concepts related to linear systems theory and signal processing. The goals of the SPIF lab.are to augment, enhance, and interconnect sophomore, junior, and senior level courses with the common thread of linear systems and transforms by unifying the experimentation medium. In this fashion, physical phenomenon is returned to the forefront of engineering education. The lab.ratory features powerful Mathematica Notebooks (a form of hypertext) and interactive applications that use dedicated DSP microprocessors.

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INTERPOLATIVE BTC IMAGE-CODING

INTERPOLATIVE BTC IMAGE-CODING

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INTERNATIONAL CONF ON ACOUSTICS, SPEECH AND signal processing

作者： ZENG, B NEUVO, Y VENETSANOPOULOS, AN Dept. of Electrical Engineering Univ. of Toronto Toronto M5S 1A4 ON Canada Signal Processing Lab. Tampere Univ. of Technology Tampere SF-33101 Finland

ISBN: (纸本)0780305329

Two interpolative BTC image coding schemes with vector quantization (VQ) and median filters as the interpolator are proposed. The first scheme is based on quincunx sub-sampling and the second one on everyother-row-and-every-other-column sub-sampling. Compared to the standard BTC, the new schemes yield a significant reduction in bit rate, only a small degradation in quality, and better channel error resisting capabilities. Moreover, the methods are shown to outperform the BTC schemes with pure VQ at the same bit rate and require minimal computations for the interpolation. © 1992 IEEE.

关键词： Median filters

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Window matching in the time-frequency plane and the adaptive spectrogram

Window matching in the time-frequency plane and the adaptive...

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1992 IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis

作者： Jones, G. Boashash, B. Commun. Res. Lab. McMaster Univ. HamiltonONL8S 4K1 Canada Centre for Signal Processing Research Queensland University of Technology BrisbaneQLD4000 Australia

ISBN: (纸本)0780308050

This paper discusses aspects of generating spectrograms which may be used in the preliminary steps of time-frequency analysis. It is shown that the major problem with application of the spectrogram is its non-unique nature - utilising an arbitrary window for analysis. The concept of window matching is introduced, whereby the window used for analysis is selected dependent on the instantaneous signal characteristics at the given time-frequency point under analysis. Generalised instantaneous parameters are derived and subsequently used to demonstrate how the window matching may be applied. An adaptive window-matched spectrogram is then generated, with results shown for practical data. © 1992 IEEE.

关键词： Audio signal processing

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Weighted vector median operation for filtering multispectral data

Weighted vector median operation for filtering multispectral...

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IEEE International Conference on Systems Engineering

作者： K. Oistamo Q. Liu M. Grundstrom Y. Neuvo Signal Process. Lab. Tampere Univ. of Technol. Finland Signal Processing Laboratory Tampere University of Technology Tampere Finland

Weighted vector median and weighted extensive vector median operations for filtering multispectral data are proposed. The operations share the good qualities of vector median filters, but allow extra freedom in the filter design. The weights of the input samples are defined as vectors. With this structure the possible difference in the noise statistics in the different signal components can be taken into account. An example of the weighted vector median for color image filtering is given.< >

关键词： Filtering Filters signal processing Colored noise Color Virtual manufacturing lab.ratories Statistics signal processing algorithms TV

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Distribution of roundoff noise in binary floating-point addition

Distribution of roundoff noise in binary floating-point addi...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： K. Kalliojarvi Y. Neuvo Signal Process. Lab. Tampere Univ. of Technol. Finland Signal Processing Laboratory Tampere University of Technology Tampere Finland

A method for deriving the distribution of relative round off error in addition of two binary floating-point numbers is introduced. The distribution is needed in the calculation of variance of the relative roundoff error in floating-point addition. The resulting distribution depends on the statistics of the addends and the rounding strategy chosen. As an example, the distribution is derived for the addition of two uncorrelated numbers from Gaussian distribution. The result was verified by simulation.< >

关键词： Roundoff errors Floating-point arithmetic signal processing lab.ratories Statistical distributions Gaussian distribution Distribution functions Random variables Probability density function Laplace equations

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A communications architecture concept for ATIS

A communications architecture concept for ATIS

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VNIS 1991

作者： Ristenbatt, Marlin P. Communications and Signal Processing Lab. Department of Electrical Engrg. and Computer Science University of Michigan Ann Arbor MI United States

Three recent developments suggest cost-beneficial approaches to communications for Advanced Traveler Information Systems (ATIS): 1) the use of FM subcarrier for efficient paging-type (digital) one-way broadcast, along with the upcoming introduction of Radio Data System (RDS) vehicle receivers, 2) the rapidly growing use of RF "tags" for automatic tolling, which have recently been upgraded for discrete zone two-way communication, and 3) the "signal processing gain" and "demand access" capability of spread-spectrum-type coding, which together make event-driven communications more feasible and cost-beneficial. An architecture concept exploiting these thrusts is outlined in terms of a "baseline" and a higher level ATIS. The baseline emphasizes basic traffic exception and safety messages and supports higher level (optional) services such as navigators and invehicle route guidance computers. The baseline portion emphasizes minimum cost;overall the level-of-service choices of both the consumer and the traffic manager are maximized.

关键词： Costs

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General criterion for the absence of limit cycles in filter structures with a single quantizer

General criterion for the absence of limit cycles in filter ...

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

作者： T. Laasko P.S.R. Diniz I. Hartimo Lab. of Signal Process. & Comput. Technol. Helsinki Univ. of Technol. Espoo Finland Department of Electrical Engineering Federal University of Rio de Janeiro (COPPE-EE) Rio de Janeiro Brazil Laboratory of Signal Processing and Computer Technology Helsinki University of Technology Espoo Finland

A criterion for the absence of zero-input limit cycles in recursive digital filter structures that can be implemented with a single quantizer in the recursive loop is presented. The criterion can be applied with a rounding or with a magnitude truncation quantizer and accounts for the use of error feedback as well. Additionally, a criterion for the elimination of constant-input limit cycles is formulated. The criteria are applied to several well-known filter structures. Since most of the structures have previously been analyzed in a multiquantizer implementation only, new results on their stability properties in the single-quantizer configuration are obtained.< >

关键词： Limit-cycles Digital filters Feedback Quantization Finite impulse response filter Transfer functions Stability analysis Lattices Steady-state Noise reduction

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On the Application of Associative Method to Chinese Connected Digit Recognition

On the Application of Associative Method to Chinese Connecte...

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1987 European Conference on Speech technology, ECST 1987

作者： Jiu-Long, Wang Xue-Gong, Yuan Guo-Tian, Zhao Speech Signal Processing Lab. Department of Radio Engineering Harbin Institute of Technology Harbin China

In this paper, a recogniton algorithm based on the characteristics of Chinese is proposed for the real-time recognition of Chinese connected digit using an associative method. A Chinese character is a CV monosyllab.e. A Chinese digit string is easy to be segmented into individual digits which carrys little information. The present DTW method only takes account of entire difference between two digits regardless of local difference whose exsistance sometimes is enough for us to distinguish the two digits from each other. We have found: *** recognition performance will improve when recognition results from two seperated parts of one digit are associated. 2. the recognition performance will improve further when recognition results from different distance measures are associated. Using above recognition method, we have conducted several experiments on four-to-five-digit strings.A 16-ch BPF is used as spectral analyzer. For the speech spoken at normal speed C about 200 to 250 digits/min.). the recognition accuracy is greater than 97% with a response time less than 0.5 second. © European Conference on Speech technology, ECST 1987. All rights reserved.

关键词： Spectrum analyzers

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