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2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628)

1-3 July 2002

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  • 2002 14th International Conference on Digital Signal Processing Proceedings DSP

    Publication Year: 2002, Page(s):V - XLVIII
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    Freely Available from IEEE
  • Author index

    Publication Year: 2002, Page(s):XLIX - LVI
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    Freely Available from IEEE
  • A medical acoustic signal analysis method based on Zipf law

    Publication Year: 2002, Page(s):615 - 618 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (275 KB) | HTML iconHTML

    We present in this paper a medical signal analysis method that we have developed in order to study, in an atraumatic and non-invasive way, the inferior oesophageal sphincter behaviour. This one plays an important part in the gastro-oesophageal reflux phenomenon. The proposed method is more efficient and is better suited to our problem than traditional signal processing methods that did not give go... View full abstract»

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  • Robust and fast convergent blind multi-user detectors for DS-CDMA systems in nonstationary multipath environments

    Publication Year: 2002, Page(s):627 - 630 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB) | HTML iconHTML

    A set of adaptive receivers is proposed in this paper for direct-sequence code division multiple access (DS/CDMA) systems. Specifically we develop adaptive step-size blind algorithms which are based on constant modulus (CMA), constrained minimum output energy (CMOE) and multiuser constant modulus (MU-CMA) criteria. The applications of these algorithms to a nonstationary multipath environment were ... View full abstract»

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  • Sound reproduction system with adaptive compensation of temperature fluctuation effect

    Publication Year: 2002, Page(s):989 - 992 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (253 KB) | HTML iconHTML

    We describe a method of compensating temperature fluctuation by a linear-time-warping processing in a sound reproduction system. This technique is applied to impulse responses of room transfer functions, to achieve a high-quality sound reproduction system, particularly one that treats high-frequency components. Moreover, we propose an adaptive algorithm for the estimation of a suitable warping rat... View full abstract»

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  • A local approach for fast line detection

    Publication Year: 2002, Page(s):1109 - 1112 vol.2
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (299 KB) | HTML iconHTML

    In this paper we are concerned with line detection for scene modelling. So we focus on horizontal and vertical lines and we propose a fast local approach to detect lines in binary images. The approach described here can easily be extended to lines characterized by other directions. Pixels are analysed using an accumulator on a block-based basis in order to obtain possible line segments for each bl... View full abstract»

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  • N dimensional Mojette transform. Application to multiple description

    Publication Year: 2002, Page(s):1211 - 1214 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB) | HTML iconHTML

    The Mojette transform allows to exactly represent a discrete signal from a finite set of hyper-planes. This generic transform (many projection directions, choice of the number of projections, spline order) always ensures a very low complexity comparable to the FFT. In this paper, the Mojette transform in dimension n is presented and results issued from 2D and 3D cases are generalized. The central ... View full abstract»

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  • DSP teleoperation for digital signal processing teaching and training via Internet

    Publication Year: 2002, Page(s):1253 - 1256 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB) | HTML iconHTML

    We present a project dedicated to DSP (digital signal processor/processing) teaching. This project is under development at INSA-Rennes and is entitled TELEDITS (TELEoperation de DSP par Internet pour le Traitement du Signal) an acronym for "DSP remote control through Internet for signal processing". Our goal is to propose different aspects in digital signal processing teaching and training. TELEDI... View full abstract»

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  • Parametric architecture for implementing multimedia algorithms

    Publication Year: 2002, Page(s):1261 - 1264 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (259 KB) | HTML iconHTML

    Multimedia applications are characterized by high computational demands related to data transfer and storage operations. Multimedia algorithms in their majority consist of regular repetitive loop constructs. In this paper, a novel control architecture for implementing such loop intensive algorithms is described. The proposed control unit takes advantage of the regularity of computations in order t... View full abstract»

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  • Improving the speed and performance of adaptive equalizers via transform based adaptive filtering

    Publication Year: 2002, Page(s):1301 - 1304 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB) | HTML iconHTML

    Adaptive equalizers are widely used in many communication systems where the channel frequency response characteristics are either time varying or unknown such as the case in wireless and dial up telecommunication networks where the communication channel constantly change due to the different packet routes and switching that takes place, as well as due to the changes in the RF propagation. This wor... View full abstract»

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  • A neural network-genetic algorithm scheme for optimal grouping of individual cores in three-phase distributed transformers

    Publication Year: 2002, Page(s):1061 - 1064 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB) | HTML iconHTML

    This paper presents an effective method to reduce the iron losses of wound core distribution transformers based on a combined neural network-genetic algorithm approach. The originality of the work is that it tackles the iron loss reduction problem during the transformer production phase, while previous works were concentrated on the design phase. More specifically, neural networks effectively use ... View full abstract»

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  • A new algorithm for explicit time delay estimation

    Publication Year: 2002, Page(s):1297 - 1300 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (303 KB) | HTML iconHTML

    In this paper, we address the problem of on-line subsample time delay estimation of narrowband signals of known center frequency. The proposed mixed modulated Lagrange explicit time delay estimation algorithm (MMLETDE) is a modulated Lagrange ETDE but the delay estimate adaptation process is based on the truncated sinc fractional delay filter algorithm. We show that MMLETDE requires only a small f... View full abstract»

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  • Synchronization in a chaotic neural network

    Publication Year: 2002, Page(s):1057 - 1060 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (310 KB) | HTML iconHTML

    We study the evolution of three identical, resistively coupled, nonlinear and nonautonomous electric circuits from nonsynchronized oscillations to synchronized ones, when they exhibit chaotic behavior. The three circuits form a ring with a neural-type connection. Synchronization is always possible, when the voltage sources of the driven circuits of the network are in phase. If there is a phase dif... View full abstract»

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  • Adaptable neural networks for modeling recursive non-linear systems

    Publication Year: 2002, Page(s):1191 - 1194 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB) | HTML iconHTML

    An efficient algorithm for recursive estimation of a non-linear autoregression (NAR) model is proposed. In particular, the model parameters are dynamically adapted through time so that (a) the model response, after the parameter updating, satisfies the current conditions and (b) a minimal modification of the model parameters is accomplished. The first condition is expressed by applying a first-ord... View full abstract»

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  • Towards non-parametric gridding of microarray images

    Publication Year: 2002, Page(s):623 - 626 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (441 KB) | HTML iconHTML

    cDNA microarrays, or biochips, are a technology used to measure gene expression on a large-scale basis. One of the critical issues of microarray experiments is the analysis of the produced images, which are the raw data from which measurements need to be made. However, the first stage, i.e. spot gridding, is not performed fully automatically in most microarray image analysis software. A novel, non... View full abstract»

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  • H bounded optimal updating - down-dating algorithm

    Publication Year: 2002, Page(s):1293 - 1296 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (341 KB) | HTML iconHTML

    The LMS algorithm, which is widely used in the adaptive filtering community, has been proved to be H∞ optimal. We (Kothari et al. (2002)) have analyzed the other performance measures in the H∞ setting which are of direct relevance to adaptive filtering and system identification. In that paper we considered the system identification and estimation employing exponen... View full abstract»

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  • Probabilistic neural networks combined with GMMs for speaker recognition over telephone channels

    Publication Year: 2002, Page(s):1081 - 1084 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB) | HTML iconHTML

    We study the applicability of probabilistic neural networks (PNNs) as core classifiers to medium scale speaker recognition over fixed telephone networks. In particular, banking applications with up to 400 enrolled speakers and short training times are targeted. Two PNN-based open-set text-independent systems, for speaker identification and speaker verification, respectively, are presented. The per... View full abstract»

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  • State-trajectory behavior in high-order, lowpass sigma-delta modulators with distinct NTF zeros

    Publication Year: 2002, Page(s):1053 - 1056 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (338 KB) | HTML iconHTML

    This paper presents a generic, scalable approach to obtain closed-form state-trajectory expressions for high-order (order > 2) lowpass sigma-delta (ΣΔ) modulators with distinct noise transfer function (NTF) zeros. Constant modulator input is assumed. The techniques of state-space diagonalization, continuous-time embedding, and Poincare map analysis are combined and extended. It is show... View full abstract»

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  • A low-complexity silence suppression algorithm for mobile communication in noisy environments

    Publication Year: 2002, Page(s):1187 - 1190 vol.2
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB) | HTML iconHTML

    The paper presents a new low-complexity algorithm for silence suppression in adverse acoustic environments. The algorithm uses a single input parameter given to a simple matching block. The decision module adapts a series of thresholds by varying the estimated signal to noise ratio. A series of tests carried out using a large speech database confirm a 10% improvement in performance as compared wit... View full abstract»

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  • Image retrieval using a fractal signature extraction technique

    Publication Year: 2002, Page(s):1215 - 1218 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (401 KB) | HTML iconHTML

    Content-based image retrieval has become a reliable tool for digital image applications. There are several advantages of the image retrieval techniques compared to other simple retrieval approaches such as text-based retrieval techniques. This paper proposes a new method for color image retrieval, suitable for color image databases. It is based on a fractal scanning technique, which is used to ext... View full abstract»

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  • Teager energy based blood cell segmentation

    Publication Year: 2002, Page(s):619 - 622 vol.2
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB) | HTML iconHTML

    A new method for fast and simple segmentation of peripheral blood smears using the Teager energy operator (TEO) is presented. The two-part algorithm efficiently segments leucocytes present in the smear into nucleus and cytoplasm. The local mean weighted high pass filtering property of the Teager energy operator is used to identify and distinguish the nucleus of white blood cells. Cytoplasm present... View full abstract»

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  • Analysis of long-range correlations in geoelectrical signals measured in southern Italy

    Publication Year: 2002, Page(s):911 - 915 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (327 KB) | HTML iconHTML

    We investigate, by detrended fluctuation analysis (DFA), the long-range correlations in the time series of the hourly mean geoelectrical signals measured during 1995-1996 at the Tramutola station, located in one of the most seismically active areas of southern Italy. Scaling behaviour has been found in the time series of self-potentials. Characterizing the temporal fluctuations of the geoelectrica... View full abstract»

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  • Quasi-Newton formulation and analysis of split LMS

    Publication Year: 2002, Page(s):753 - 756 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (305 KB) | HTML iconHTML

    A new filtering structure called split filtering was proposed by Ho and Ching (1992) and by Ching and Wan (1995). It was applied to the blind equalization domain and seems to speed up the adaptation and avoid local minima. Thanks to a reformulation of the split structure, we show that the adaptation belongs to the quasi-Newton algorithm class. Through the efficacy criterion proposed by Moustakides... View full abstract»

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  • A robust subspace tracking algorithm for subspace-based blind multiuser detection in impulsive noise

    Publication Year: 2002, Page(s):1289 - 1292 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB) | HTML iconHTML

    Subspace tracking is an efficient method to reduce the complexity in estimating the signal subspace required in subspace-based multiuser detection algorithm. Recursive least square (RLS)-based subspace tracking algorithms such as the PAST algorithm can be used to estimate the signal subspace adaptively with relatively low computational complexity. However, it is shown in this paper that subspace e... View full abstract»

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  • On robust AR speech analysis based on quadratic classifier with heuristically decision threshold

    Publication Year: 2002, Page(s):1077 - 1080 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB) | HTML iconHTML

    The paper considers a robust recursive procedure for identifying a nonstationary AR speech model based on a quadratic classifier with a heuristic decision threshold. Two versions of the robust procedure with heuristic decision threshold, based on a frame-based quadratic classifier and a quadratic classifier with a sliding training data set, are evaluated and compared through analyzing natural spee... View full abstract»

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