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IEEE Signal Processing Letters

Issue 5 • Date May 2003

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Displaying Results 1 - 8 of 8
  • A simple mapping between Mth-band FIR filters using cosine modulation

    Publication Year: 2003, Page(s):125 - 128
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (302 KB) | HTML iconHTML

    This article presents a novel approach in linear-phase finite-impulse response filter design based on cosine modulation. It is shown that the proposed technique is equivalent to a simple mapping between Mth-band filters, i.e., given an Lth-band filter, an Mth-band filter can be obtained by simple calculation where L and M are different integers. View full abstract»

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  • Adaptive Landweber method to deblur images

    Publication Year: 2003, Page(s):129 - 132
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (439 KB) | HTML iconHTML

    We present an adaptive Landweber method (ALM) to reconstruct an image from a blurred observation. The standard Landweber method (LM) is an iterative method to solve "ill-posed" problems encountered in image restoration. The standard LM uses a constant update parameter. It has the disadvantage of slow convergence. Instead of using a constant update parameter, the adaptive method computes the update... View full abstract»

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  • Robust stability of two-dimensional uncertain discrete systems

    Publication Year: 2003, Page(s):133 - 136
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (286 KB) | HTML iconHTML

    We deal with the robust stability problem for linear two-dimensional (2-D) discrete time-invariant systems described by a 2-D local state-space (LSS) Fornasini-Marchesini (1989) second model. The class of systems under investigation involves parameter uncertainties that are assumed to be norm-bounded. We first focus on deriving the sufficient conditions under which the uncertain 2-D systems keep r... View full abstract»

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  • Speech feature analysis using variational Bayesian PCA

    Publication Year: 2003, Page(s):137 - 140
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB) | HTML iconHTML

    In most hidden Markov model-based automatic speech recognition systems, one of the fundamental questions is to determine the intrinsic speech feature dimensionality and the number of clusters used on the Gaussian mixture model. We analyzed mel-frequency band energies using a variational Bayesian principal component analysis method to estimate the feature dimensionality as well as the number of Gau... View full abstract»

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  • Text-independent speaker verification with dynamic trajectory model

    Publication Year: 2003, Page(s):141 - 143
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (269 KB) | HTML iconHTML

    A novel approach is presented for text-independent speaker verification. Based on the frequencies of occurrence of Gaussian component strings in the quantized acoustic trajectories, a universal background trajectory model and multiple target trajectory models are created for the background and target speakers separately. Analysis of the speaker entropy in the trajectory space demonstrates that the... View full abstract»

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  • Calculating moments of exponential densities using differential algebraic equations

    Publication Year: 2003, Page(s):144 - 147
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (414 KB) | HTML iconHTML

    This article introduces an efficient approach for calculating the moments of exponential densities. Usually, the desired moments are obtained by means of numerical integration, which is impractical due to its computational complexity and the underlying infinite integration intervals. The new approach relies on an exact conversion of these integrals into a system of ordinary differential equations ... View full abstract»

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  • A fast blind SIMO channel identification algorithm for sparse sources

    Publication Year: 2003, Page(s):148 - 151
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB) | HTML iconHTML

    We address the blind identification of single-input-multiple output (SIMO) finite impulse response systems when the input signal is sparse. The problem is equivalent to underdetermined blind source separation (BSS), but with temporal correlation among the sources. Exploiting the sparse character of the input signal, the algorithm solves three different problems: first, to estimate the directions o... View full abstract»

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  • Modified CIC filter for sample rate conversion in software radio systems

    Publication Year: 2003, Page(s):152 - 154
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (435 KB) | HTML iconHTML

    Cascaded-integrator-comb (CIC) filters perform sample rate conversion (SRC) efficiently using only additions/subtractions. However, the limited number of tuning parameters may make conventional CIC filters unsuitable for SRC in software radio (SWR) systems. A simple modification to the CIC filter that enhances its SRC performance at the expense of requiring a few extra computations per output samp... View full abstract»

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Aims & Scope

The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

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Meet Our Editors

Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu