IEEE Signal Processing Letters

Volume 11 Issue 8 • Aug. 2004

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Displaying Results 1 - 19 of 19
  • Table of contents

    Publication Year: 2004, Page(s):c1 - c4
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  • IEEE Signal Processing Letters publication information

    Publication Year: 2004, Page(s): c2
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  • Robust speaker change detection

    Publication Year: 2004, Page(s):649 - 651
    Cited by:  Papers (67)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (106 KB) | HTML iconHTML

    Most commonly used criteria for speaker change detection like log likelihood ratio (LLR) and Bayesian information criterion (BIC) have an adjustable threshold/penalty parameter to make speaker change decisions. These parameters are not always robust to different acoustic conditions and have to be tuned. In this letter, we present a criterion which can be used to identify speaker changes in an audi... View full abstract»

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  • SNR threshold indicator in data-aided frequency synchronization

    Publication Year: 2004, Page(s):652 - 654
    Cited by:  Papers (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (140 KB) | HTML iconHTML

    The signal-to-noise ratio (SNR) threshold behavior is studied in the frame of data-aided carrier synchronization in additive white Gaussian noise. The closed form expression of the Chapman-Robbins bound, relative to the carrier frequency offset estimation is first established then used to derive an indicator of the SNR threshold. For a given sequence of pilot symbols, the threshold region is local... View full abstract»

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  • Maximal gap of a sampling set for the exact iterative reconstruction algorithm in shift invariant spaces

    Publication Year: 2004, Page(s):655 - 658
    Cited by:  Papers (14)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (187 KB) | HTML iconHTML

    A conventional A/D converter prefilters a signal by an ideal lowpass filter and performs sampling for bandlimited signals by the Nyquist sampling rate. Recent research reveals that A/D conversion in a shift invariant space provides more flexible choices for designing a practical A/D conversion system of high accuracy. This paper focuses on the maximal gap of a sampling set for the iterative algori... View full abstract»

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  • Robust filtering for discrete-time Markovian jump delay systems

    Publication Year: 2004, Page(s):659 - 662
    Cited by:  Papers (104)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (173 KB) | HTML iconHTML

    In this letter, we study the robust filtering problem for linear uncertain discrete time-delay systems with Markovian jump parameters. The system under consideration is subjected to time-varying norm-bounded parameter uncertainties, time-delay in the state, and Markovian jump parameters in all system matrices. A filter is designed to guarantee that the dynamics of the estimation error is robustly ... View full abstract»

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  • Generation of signed-digit representations for integer multiplication

    Publication Year: 2004, Page(s):663 - 665
    Cited by:  Papers (22)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (89 KB) | HTML iconHTML

    This letter presents an algorithm for generating all of the signed-digit representations of a given integer. There is an infinite number of representations, so the tree algorithm is terminated when a defined number of digits above the minimum possible is reached. It is shown that by having available these other representations, more efficient multiplication circuits can be designed than when using... View full abstract»

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  • Study on the dynamic range of delta modulations with time-varying sampling periods

    Publication Year: 2004, Page(s):666 - 669
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (385 KB) | HTML iconHTML

    The theory of 1-bit adaptive delta modulations (ADM) systems with uniform sampling rate is well known. Analytical study on the influence of sampling rate adaptation on companding capabilities of delta modulations have been carried out in the present paper. The described ADM systems encode the input signal by changing the sampling intervals and/or step size according to it's time-varying slope char... View full abstract»

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  • On unification of equivalent bandwidths of a random process

    Publication Year: 2004, Page(s):670 - 673
    Cited by:  Papers (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (190 KB) | HTML iconHTML

    In the theory of random processes, numerous equivalent bandwidths (EBWs) have been proposed and used practically in many fields. In this report, we first show that the six important EBWs, having been used very often in many fields, are sorted into four kinds of EBW. Second, we show that the class suggested by Zakai provides a unified representation of the four, and it can be redefined by using Ren... View full abstract»

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  • First absolute moment and variance estimators used in JPEG reconstruction

    Publication Year: 2004, Page(s):674 - 677
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (144 KB) | HTML iconHTML

    Rice and Rabbani modeled the distribution density of discrete cosine transform (DCT) coefficients by means of the Laplacian distribution. Parameters of the model were estimated on the basis of quantized values of DCT coefficients available to the decoder, employing the maximum likelihood method (MLM). In this letters, two estimators (alternatives to the maximum likelihood one) of the discrete Lapl... View full abstract»

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  • On ambiguities in super-resolution modeling

    Publication Year: 2004, Page(s):678 - 681
    Cited by:  Papers (21)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (641 KB) | HTML iconHTML

    Some models for super-resolution restoration assume that low-resolution (LR) images are formed from high-resolution (HR) ones by a warping first, blurring second (followed by decimating) imaging process; whereas others adopt a blurring first, warping second imaging constraint. These models are abused to some extent and respective conditions for usability of them are not identified. Such ambiguitie... View full abstract»

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  • Minimum delay spread TEQ design in multicarrier systems

    Publication Year: 2004, Page(s):682 - 685
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (174 KB) | HTML iconHTML

    Recently, a time-domain equalizer (TEQ) design for multicarrier-based systems has been proposed which claims to minimize the delay spread of the overall channel impulse response. We show that this is true only in an approximate sense; depending on the channel considered, the loss in delay spread with respect to the true minimum can be significant. An iterative algorithm to find this minimum is pre... View full abstract»

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  • Iterative decoding of differentially space-time coded multiple descriptions of images

    Publication Year: 2004, Page(s):686 - 689
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (204 KB) | HTML iconHTML

    We consider transporting images over wireless fading channels rather than the on-off channels considered in most works related to multiple description (MD) coding. The new idea is to use iterative (turbo) decoding techniques developed for serially concatenated coding systems to improve the performance of the receiver in successive decoding iterations. We treat MD coding, realized by embedded image... View full abstract»

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  • An efficient vector sensor configuration for source localization

    Publication Year: 2004, Page(s):690 - 693
    Cited by:  Papers (32)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (188 KB) | HTML iconHTML

    An electromagnetic vector-sensor enables estimation of the direction of arrival (DOA) and polarization of an incident electromagnetic wave with arbitrary polarization. In this letter, an efficient vector-sensor configuration is proposed. This configuration includes the minimal number of sensors, which enables DOA estimation of an arbitrary polarized signal from any direction except two opposite di... View full abstract»

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  • A new rate-distortion model for video transmission using multiple logarithmic functions

    Publication Year: 2004, Page(s):694 - 697
    Cited by:  Papers (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (167 KB) | HTML iconHTML

    In this letter, we propose a new logarithmic rate distortion model for DCT-based video encoders. The proposed model can fit into the actual rate curve by combining several logarithmic functions, where the boundary of each function is adaptive to the statistics of video sequence. Experimental results demonstrate that the new rate distortion model provides a more accurate estimation of the bit rate ... View full abstract»

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  • Generalization of spectral flatness measure for non-Gaussian linear processes

    Publication Year: 2004, Page(s):698 - 701
    Cited by:  Papers (30)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (164 KB) | HTML iconHTML

    We present an information-theoretic measure for the amount of randomness or stochasticity that exists in a signal. This measure is formulated in terms of the rate of growth of multi-information for every new signal sample of the signal that is observed over time. In case of a Gaussian statistics it is shown that this measure is equivalent to the well-known spectral flatness measure that is commonl... View full abstract»

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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2004, Page(s):702 - 703
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  • IEEE 2005 International Conference on Image Processing

    Publication Year: 2004, Page(s): 704
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  • IEEE Signal Processing Society Information

    Publication Year: 2004, Page(s): c3
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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
James E. Fowler
Dept Electrical & Computer Engineering
Associate Director                         
Distributed Analytics and Security Institute
Mississippi State University
Mississippi State, MS 39762 USA
fowler@ece.msstate.edu