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IEEE Signal Processing Letters

Issue 5 • Date May 1999

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Displaying Results 1 - 10 of 10
  • Quantization performance in SPIHT and related wavelet image compression algorithms

    Publication Year: 1999, Page(s):97 - 99
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (40 KB)

    The set partitioning in hierarchical trees (SPIHT) image coding algorithm is observed to provide progressive classification of the wavelet coefficients. The achievable quantization performance of the induced classes is evaluated for entropy coded scalar quantization and trellis coded quantization, and is compared to the first-order rate distortion function. View full abstract»

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  • An analysis of isometry transforms in frequency domain for fast fractal encoding

    Publication Year: 1999, Page(s):100 - 102
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    A new fast fractal encoding algorithm, which minimizes the iterations of isometry transforms for each domain block, is proposed. The effects of isometry transforms are analyzed in the Walsh-Hadamard transform (WHT) domain, and the search for the minimum Euclidean-distance isometry transform to a range block starts with the one having the minimum feature distance. The search is then terminated with... View full abstract»

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  • Generalized scalar quantizer design using dynamic programming

    Publication Year: 1999, Page(s):103 - 105
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    We cast the design of generalized scalar quantizers as a dynamic programming problem. The algorithm enables the design of discrete nonparametric estimators directly from training data and has the advantage of admitting a variety of constraints on the estimator mapping. The utility of the algorithm is illustrated with the design of rate-distortion performance predictors for a video coder. View full abstract»

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  • Effect of loudspeaker position on the robustness of acoustic crosstalk cancellation

    Publication Year: 1999, Page(s):106 - 108
    Cited by:  Papers (32)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    Acoustic crosstalk cancellation is a signal processing technique whereby two (or possibly more) loudspeakers are used to deliver desired signals exactly at the listener's ears. Such a system is useful for three-dimensional (3-D) audio applications, and removes the requirement for the listener to wear headphones. However, crosstalk cancelers are notoriously nonrobust to slight movements in head pos... View full abstract»

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  • Time-frequency MUSIC

    Publication Year: 1999, Page(s):109 - 110
    Cited by:  Papers (87)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB)

    A new method for the estimation of the signal subspace and noise subspace based on time-frequency signal representations is introduced. The proposed approach consists of the joint block-diagonalization (JBD) of a set of spatial time-frequency distribution matrices. Once the signal and noise subspaces are estimated, any subspace based approach, including the multiple signal classification (MUSIC) a... View full abstract»

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  • Balanced GHM-like multiscaling functions

    Publication Year: 1999, Page(s):111 - 112
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (65 KB)

    The Geronimo-Bardin-Massopust (see J. Approx. Theory, vol.78, p.373-401, 1994) multiwavelet basis exhibits symmetry, orthogonality, short support, and approximation order K=2, which is not possible for wavelet bases based on a single scaling-wavelet function pair. However, the filterbank associated with this basis does not inherit the zero moment properties of the basis. This work describes a vers... View full abstract»

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  • High-speed moving source analysis using chirplets

    Publication Year: 1999, Page(s):113 - 115
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (69 KB)

    This article introduces a new method for localizing high-speed moving sources with a microphone array followed by a chirplet transform. A well-adapted chirplet is constructed and the accuracy of the method is studied within a general case. Simulations and real data from the high-speed train (Train a Grande Vitesse), are compared with the current deDopplerization method. View full abstract»

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  • Frequency warping with arbitrary allpass maps

    Publication Year: 1999, Page(s):116 - 118
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    A method for the computation of spectra with nonuniform resolution using a preprocessed fast Fourier transform (FFT), due to Oppenheim et al. (1971), is reviewed and extended to arbitrary allpass distortion maps. The magnitude response and distortion properties of the resulting infinite impulse response (IIR) cascade are no longer coupled; the resulting choices for frequency response compensation,... View full abstract»

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  • A GLRT detector for bursty targets in multiplicative noise

    Publication Year: 1999, Page(s):119 - 121
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    A robust generalized likelihood ratio test (GLRT) detector is derived for targets in multiplicative noise with gamma-Weibull statistics. The target is assumed to have a spatial distribution (burstiness) modeled by the incomplete binomial distribution. The GLRT detector is found to be similar in performance to the optimized power law detector. View full abstract»

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  • Rejection and tracking of an unknown broadband source in a two-element array through least square approximation of inter-element delay

    Publication Year: 1999, Page(s):122 - 125
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (157 KB)

    A new algorithm to reject and track an unknown broadband source by approximating the inter-element delay in a two-element adaptive array is investigated. Essentially, by constraining the response of the L-tap processing filter to a delay in the least squares sense, the number of adaptive parameters is reduced to merely an unknown gain and delay, which can then be adjusted to reject the unknown sou... View full abstract»

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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