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Multimedia Systems and Applications VIII

作者： Park, Sung-Bum Kim, Chang-Su Lee, Sang-Uk Signal Processing Lab. School of Electrical Engineering and Computer Science Seoul National University Seoul 151-741 Korea Republic of Department of Electronics and Computer Engineering Korea University Seoul Korea Republic of School of Electrical Engineering and Computer Science Seoul National University San 56-1 Shillim-dong Gwanak-gu Seoul 151-742 Korea Republic of

ISBN: (纸本)0819460397

An algorithm for robust transmission of compressed 3-D mesh data is proposed in this work. In the encoder, we partition a 3-D mesh adaptively according to the surface complexity, and then encode each partition separately to reduce the error propagation effect. To encode joint boundaries compactly, we propose a boundary edge collapse rule, which also enables the decoder to zip partitions seamlessly. In the decoder, an error concealment scheme is employed to improve the visual quality of corrupted partitions. The concealment algorithm utilizes the information in neighboring partitions and reconstructs the lost surface based on the semi-regular connectivity reconstruction and the polynomial interpolation. Simulation results demonstrate that the proposed algorithm provides a good rendering quality even in severe error conditions.

关键词： Image reconstruction

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DWT-based phonetic groups classification using neural networks

DWT-based phonetic groups classification using neural networ...

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

作者： T.V. Pham G. Kubin Signal Process. & Speech Commun. Lab. Technische Univ. Graz Austria Signal Processing and Speech Communication Laboratory University of Technology Graz Austria

This paper presents an improvement of the discrete wavelet transform (DWT)-based phonetic classification algorithm by using neural networks (NN) to learn optimal thresholds for speech classification. Two feedforward NNs (two layers) operate on input features extracted from speech frames (10 ms length) by DWT and statistical measurement in order to classify these frames as transient, voiced vowel, voiced consonant and unvoiced consonant categories. Hard thresholds in our earlier paper are used to detect silence and voiced closure intervals. The new algorithm is tested with the TIMIT database and compared with other algorithms to demonstrate its superior performance.

关键词： Discrete wavelet transforms Neural networks signal processing algorithms Speech processing Multiresolution analysis Speech coding Backpropagation algorithms signal processing Oral communication lab.ratories

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Cost-Performance Co-Analysis in VLSI Implementation of Existing and New Defuzzification Methods

Cost-Performance Co-Analysis in VLSI Implementation of Exist...

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International Conference on Computational Intelligence for Modelling, Control and Automation, and International Conference on Intelligent Agents, Web Technologies and Internet Commerce

作者： A. Banaiyan S.M. Fakhraie H.R. Mahdiani Silicon Intelligence and VLSI Signal Processing Lab University of Tehran Iran Computer and Electronics Department Power and Water University of Technology Iran

In this paper, three novel defuzzification methods are presented which are appropriate for low-cost hardware implementations. An elab.rate set of ten different defuzzification methods including our three newly-proposed ones are introduced. The C models for all of these methods are prepared for the accuracy-analysis simulations. The HDL models are also developed and synthesized to analyze the implementation cost of each method. This makes it possible to compare the accuracy of these different methods while considering their VLSI implementation costs. The accuracy analysis simulations are performed on six different sets of output fuzzy membership functions with various features to achieve more general and reliable results. A two-dimensional diagram of cost-accuracy analysis is introduced which helps the designers to choose the defuzzification method which best suits their application

关键词： Very large scale integration Hardware Costs Fuzzy control Fuzzy set theory Fuzzy systems Power demand Application software Power engineering computing Analytical models

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The Applications of Generalized Computing In Knowledge Management

The Applications of Generalized Computing In Knowledge Manag...

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2005年公共管理国际会议

作者： YAO Min SHEN Bin ZHANG Yan-gu College of Computer Zhejiang University Provincial Key Lab. for Computer Information processing Technology in Jiangsu Suzhou University School of Computer Wenzhou Normal College

Generalized computing is a new kind of intelligent computing systems, which combines symbolic intelligence and computational intelligence (including neural computing, fuzzy computing and evolutional computing) together. By introducing generalized computing into knowledge management, this paper presents a kind of knowledge decision-making model, and a kind of control model of enterprise knowledge flow.

关键词： Generalized computing, Knowledge management, Enterprise management

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RAIM performance in presence of multiple range failures

RAIM performance in presence of multiple range failures

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Institute of Navigation, 2005 National Technical Meeting, NTM 2005

作者： Macabiau, Christophe Gerfault, Bertrand Nikiforov, Igor Fillatre, Lionel Roturier, Benoit Chatre, Eric Raimondi, Mathieu Escher, Anne-Christine ENAC THALES UTT STNA GJU Application of Satellite Navigation Techniques to Civil Aviation University of Technology of Troyes Institute of Computer Sciences and Engineering of Troyes FRE CNRS 2732 GNSS Navigation Subdivision STNA Galileo Joint Undertaking Eurocae WG 62 Signal Processing Lab ENAC

It is currently stated and widely accepted by industry and users that the RAIM is designed to provide timely warnings in the situation where only one of the range measurements used at the current epoch is affected by an unacceptable bias. However, given the range of potential applications of RAIM in the future, in particular with the advent of Galileo and the generalization of Safety of Life applications, which should spread from the civil aviation community to many other professional sectors, it is very important to better understand the fundamental properties of RAIM, and in particular the potential of RAIM to detect multiple failures on range measurements. The purpose of the study presented in this paper is to analyze the performance of a RAIM in the presence of multiple simultaneous range errors. In particular, we conduct a theoretical analysis to determine in which cases the Least Squares Residuals RAIM detection criterion is not affected, and analyzed results of Monte-Carlo simulations in presence of up to four range failures. The theoretical analysis outlined above aims at determining in what conditions the Least Squares Residuals RAIM detection criterion remains unaffected by multiple range failures, searching for what we call criterion unaffecting range errors. We show that, provided the satellite constellation does not have any degenerated geometrical properties, the dimension of the vector sub-space of these criterion unaffecting errors is max(4-(N-p),0), where N is the number of tracked satellites and p is the number of faulty pseudorange measurements. The immediate conclusion is that if N-4 pseudo range measurements are affected, or less than that, by a large error, there exists no error that will not affect the RAIM detection criterion, and globally due to the negligible probability that unintentional interference lies in a small dimension sub-space, the RAIM detection criterion exhibits a natural detection capability even if up to N-2 pseudo-range mea

关键词： Navigation

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Processor Enhancements for Media Streaming Applications

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Journal of VLSI signal processing systems for signal, image and video technology 2005年第2期41卷 225-234页

作者： Bilavarn, S. Debes, E. Vandergheynst, P. Diguet, J. P. Signal Processing Institute Swiss Federal Institute of Technology (EPFL) Switzerland Architecture Research Lab Intel U.S.A. Lab. of Electronics and REal Time Systems LESTER University of South Britanny U.S.A.

The development of more processing demanding applications on the Internet (video broadcasting) on one hand and the popularity of recent devices at the user level (digital cameras, wireless videophones, ...) on the other hand introduce challenges at several levels. Today, such devices present processing capabilities and bandwidth settings that are inefficient to manage scalab.e QoS requirements in a typical media delivery framework. In this paper, we present an impact study of such a scalab.e data representation optimized for QoS (Matching Pursuit 3D algorithms) on processor architectures to achieve the best performance and power efficiency. A review of state of the art techniques for processor architecture enhancement let us expect promising opportunities from the latest developments in the reconfigurable computing research field. We present here the first design steps of an efficient reconfigurable coprocessor especially designed to cope with future video delivery and multimedia processing requirements. Architecture perspectives are proposed with respect to low development cost constraints, backward compatibilty and easy coprocessor usage using an original strategy based on a hardware/software codesign methodology.

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About room response equalization and dereverberation

About room response equalization and dereverberation

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IEEE Workshop on Applications of signal processing to Audio and Acoustics

作者： M. Karjalainen T. Paatero J.N. Mourjopoulos P.D. Hatziantoniou Laboratory of Acoustics and Audio Signal Processing Helsinki University of Technology Finland Audio Group Wire Communications Lab Electrical and Computer Engineering Department University of Patras Patras Greece

Improvement of sound reproduction in rooms by signal processing techniques has been studied seriously for more than twenty years. Such methods are called for example dereverberation, room (response) equalization, and room (response) correction. Understanding the limitations and quality criteria for such methods is gradually achieved through studies of this highly multidimensional problem. In the present paper we discuss the terminology and goals, compare some recent approaches of these techniques in practical cases, and finally point out future challenges

关键词： Acoustic signal processing Multidimensional signal processing Multidimensional systems Terminology

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Journal of Information Science and Engineering: Editorial notice

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Journal of Information Science and Engineering 2005年第5期21卷 i-ii页

作者： Lee, Der-Tsai Amato, Nancy M. Chang, Shih-Fu Chen, Homer H. Chen, Tsuhan Hsu, Tsan-Sheng Hwang, Jenq-Neng Kuo, Sy-Yen Kuo, Tei-Wei Li, Chung-Sheng Tokuyama, Takeshi Wing, Jeannette Wu, Tzong-Chen Yen, John Computer Science at Texas A and M University United States Parasol Laboratory United States IEEE Transactions on Parallel and Distributed Systems Computing Research Association's Committee on the Status of Women in Computing Research CRA-W's Distributed Mentor Program United States Department of Electrical Engineering Columbia University United States Lab. United States College of Electrical Engineering and Computer Science National Taiwan University Taiwan IEEE Transactions on Circuits and Systems for Video Technology IEEE Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA United States ACM ACM SIGACT IEEE Computer Society IICM Austria Research and Development of the Department Multimedia Signal Processing Technical Committee IEEE Signal Processing Society United States IEEE Transactions on Circuits and systems for Video Technology College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan Department of Electrical Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan IEEE Technical Committee on Real-Time Systems Computer Science Division IBM T.J. Watson Research Center United States IBM Research Division Graduate School of Information Sciences Tohoku University Japan ACM IPSJ Mathematical Society of Japan Japan Department of Computer Science Computer Science Department Carnegie Mellon University United States National Academies of Science's Computer Science and Telecommunications Board United States Microsoft's Trustworthy Academic Advisory Board Intel Research Pittsburgh's Advisory Board United States Dartmouth's Institute for Security Technology Studies Advisory Committee Canada Sloan Research Fellowships Program Committee United States ACM Taiwan China Information Sciences and Technology Pennsylvania State University United States Laboratory for Intelligent Agents Penn State's School of Info

No abstract availab.e

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Adding limited reconfigurability to superscalar processors

Adding limited reconfigurability to superscalar processors

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13th International Conference on Parallel Architecture and Compilation Techniques

作者： Epalza, M Ienne, P Mlynek, D Signal Processing Institute Swiss Fed. Institute of Technology Lausanne Switzerland Processor Architecture Lab. Swiss Fed. Institute of Technology Lausanne Switzerland

ISBN: (纸本)0769522297

When adding reconfigurability to custom hardware, one must take great care that the reduction in speed due to the reconfigurable logic should not cancel out the gains obtained by reconfiguration. These gains are greatest in very specific and computation-intensive applications, and lessen as the applications become more general and heterogeneous. In the case of superscalar processors, this leads to limiting the amount of reconfigurability to precise changes in existing functional units instead of adding a fully configurable functional unit. We present a detailed study of the modifications necessary in a superscalar processor to allow an FPU to be dynamically reconfigured as several ALUs with a minimal increase in the latency of these functional units. The timing of the FPU's multiplier tree and the decision about reconfiguration are exposed. As there is more than one simple unit involved, this decision is more global than a cycle-by-cycle reconfiguration and must be made for a longer period of time. We discuss possible policies for the dynamic reconfiguration decisions. The results show interesting gains of lip to 56% in the best cases, and average gains of 10%, on typical architectures over a wide range of applications.

关键词： Program processors

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A bio-inspired sound source separation technique in combination with an enhanced FIR gammatone analysis/synthesis filterbank 12

A bio-inspired sound source separation technique in combinat...

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12th European signal processing Conference, EUSIPCO 2004

作者： Pichevar, Ramin Rouat, Jean Feldbauer, Christian Kubin, Gernot Dept. of Elect. and Computer Eng. University of Sherbrooke QC Canada Signal Processing and Speech Comm. Lab. Graz University of Technology Austria

ISBN: (纸本)9783200001657

A sound source separation technique based on a two-layered bio-inspired spiking neural network and an enhanced gammatone analysis/synthesis filterbank is proposed. One of the two bio-inspired proposed spectral maps (Cochleotopic / AMtopic or Cochleotopic / Spectrotopic) is used as a front-end to the neural network depending on the nature of the intruding sound. We show that the use of an FIR gammatone filterbank outperforms the previous results obtained by using an IIR gammatone cochlear filterbank, since the FIR implementation has near-perfect reconstruction ability and the cascade of the analysis and synthesis filterbanks is linear-phase. © 2004 EUSIPCO.

关键词： Neural networks

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