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IEEE Transactions on Signal Processing

Issue 2 • Date Feb. 1992

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Displaying Results 1 - 25 of 32
  • Comments on "A new vector quantization clustering algorithm

    Publication Year: 1992, Page(s):455 - 456
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (198 KB)

    W.H. Equitz (IEEE Trans. Acoust., Speech, and Signal Process. vol.37, no.10, p.1568-75, Oct. 1989) presented a procedure called pairwise nearest neighbor (PNN) as a new alternative to the familiar Linde-Buzo-Gray algorithm for vector quantization. The commenter maintains that inspection of the statistical literature shows the PNN algorithm to be identical to J. Ward's hierarchical clustering metho... View full abstract»

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  • On the gradient inverse weighted filter [image processing]

    Publication Year: 1992, Page(s):482 - 484
    Cited by:  Papers (16)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    D.C.C. Wang et al. (1981) presented a gradient inverse weighted (GIW) filter. The proposed noise smoothing scheme is based on the observation that variations of gray levels inside a region are smaller than those between regions. Reducing noise without smearing edges is the advantage of this nonlinear filter. As an improvement of the GIW filter, a new algorithm is introduced. Examples show that it ... View full abstract»

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  • Error analysis of a systolic realization of 2-D filters

    Publication Year: 1992, Page(s):478 - 482
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The authors discuss the complete error analysis proposed by M.A. Sid-Ahmed (1989) concerning the systolic realization of 2-D digital filters. Since 2-D finite-impulse-response (FIR) digital filters can be considered as a special case of 2-D infinite-impulse-response (IIR) digital filters, the authors focus on the error analysis of 2-D IIR digital filters. After a brief description of the systolic ... View full abstract»

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  • Applications of simulated annealing for the design of special digital filters

    Publication Year: 1992, Page(s):323 - 332
    Cited by:  Papers (84)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The authors describe the salient features of using a simulated annealing (SA) algorithm in the context of designing digital filters with coefficient values expressed as the sum of power of two. A procedure for linear phase digital filter design, using this algorithm, is presented and tested, yielding results as good as those for known optimal methods. The algorithm is then applied to the design of... View full abstract»

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  • On lapped orthogonal transforms [signal coding applications]

    Publication Year: 1992, Page(s):439 - 443
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The energy compaction performance of several lapped orthogonal transforms (LOTs) are presented. It is shown that the LOT outperforms the conventional block transforms for all the cases considered. The performance of the poorly performing block transforms for high correlation sources increased dramatically in their LOT versions. It is found that the energy compaction performance of the LOT versions... View full abstract»

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  • The broad-band Wiener solution for Griffiths-Jim beamformers

    Publication Year: 1992, Page(s):474 - 478
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The authors treat the problem of finding the Wiener filters for a wideband adaptive beamformer. Explicit expressions are given for the filters and error power spectrum in the frequency domain. The expressions are simple to program and give the possibility of investigating superresolution for wideband signals and of determining sufficient lengths of the finite-impulse-response filters in adaptive a... View full abstract»

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  • Globally optimal vector quantizer design by stochastic relaxation

    Publication Year: 1992, Page(s):310 - 322
    Cited by:  Papers (82)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1212 KB)

    The authors present a unified formulation and study of vector quantizer design methods that couple stochastic relaxation (SR) techniques with the generalized Lloyd algorithm. Two new SR techniques are investigated and compared: simulated annealing (SA) and a reduced-complexity approach that modifies the traditional acceptance criterion for simulated annealing to an unconditional acceptance of pert... View full abstract»

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  • A VLSI processor for parallel contour tracing

    Publication Year: 1992, Page(s):429 - 438
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    A custom IC processor that traces contours in black-and-white images is described. The CMOS IC contains a finite state machine, an arithmetic logic unit (ALU), an input delay line, and RAM. Each process extracts the edges from a rectangular portion of the input image and traces the edges, producing a description of the contours. A complete tracing system employs an array of these processors. The a... View full abstract»

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  • Kernel design for reduced interference distributions

    Publication Year: 1992, Page(s):402 - 412
    Cited by:  Papers (172)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    The authors present a class of time-frequency signal representations (TFRs) called the reduced interference distribution (RID). An overview of commonly used TFRs is given, and desirable distribution properties are introduced. Particular attention is paid to the interpretation of Cohen's class of time-frequency distributions of TFRs in the ambiguity, temporal correlation, spectral correlation, and ... View full abstract»

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  • Stable and efficient lattice algorithms for adaptive IIR filtering

    Publication Year: 1992, Page(s):375 - 388
    Cited by:  Papers (43)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    Previous attempts at applying lattice structures to adaptive infinite-impulse-response (IIR) filtering have met with gradient computations of O(N2) complexity. To overcome this computational burden, two new lattice-based algorithms are proposed for adaptive IIR filtering and system identification, with both algorithms of O(N) complexity. The first alg... View full abstract»

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  • Multiple-model approach to finite memory adaptive filtering

    Publication Year: 1992, Page(s):470 - 473
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The multiple-model technique is proposed for the purpose of finite memory adaptive filtering of nonstationary signals. Its most important feature is the parallel structure of computation: not one but several identification algorithms characterized by different memory-controlling parameters are run in parallel and combined appropriately. The results substantially improve the robustness of the adapt... View full abstract»

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  • Competitive learning and soft competition for vector quantizer design

    Publication Year: 1992, Page(s):294 - 309
    Cited by:  Papers (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1364 KB)

    The authors provide a convergence analysis for the Kohonen learning algorithm (KLA) with respect to vector quantizer (VQ) optimality criteria and introduce a stochastic relaxation technique which produces the global minimum but is computationally expensive. By incorporating the principles of the stochastic approach into the KLA, a deterministic VQ design algorithm, the soft competition scheme (SCS... View full abstract»

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  • Generation of uniform amplitude complex code sets with low correlation sidelobes

    Publication Year: 1992, Page(s):343 - 351
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The performances of generated test code sets are compared to other phase coding and theoretical limits. The results presented show that the generation algorithm produces uniform amplitude complex code sets with low autocorrelation sidelobes and low cross-correlation outputs. The mainlobe to peak sidelobe ratio (MPSR) gains over binary codes could lead to significant performance improvements in bot... View full abstract»

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  • Scalar quantization error analysis for image subband coding using QMFs

    Publication Year: 1992, Page(s):421 - 428
    Cited by:  Papers (46)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    The authors analyze the coding errors due to quantization by explicitly incorporating a mathematical model for a Lloyd-Max quantizer into a quadrature mirror filter (QMF) splitting and reconstruction scheme (P. H. Westerink et al., 1988). This approach explicitly incorporates quantization errors into a QMF system by means of a quantizer model. This makes it possible to discriminate between differe... View full abstract»

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  • Almost-sure convergence of the continuous-time LMS algorithm

    Publication Year: 1992, Page(s):395 - 401
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The authors consider the stability properties of the conventional continuous-time least mean square algorithm. The algorithm for the case of stationary ergodic inputs is investigated and a necessary and sufficient condition for exponential almost-sure convergence is presented. This condition is shown to be less restrictive than the well-known persistency of excitation condition. Also, the authors ... View full abstract»

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  • Lagrange multiplier approaches to the design of two-channel perfect-reconstruction linear-phase FIR filter banks

    Publication Year: 1992, Page(s):364 - 374
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The authors present two approaches to the design of two-channel perfect-reconstruction linear-phase finite-impulse-response (FIR) filter banks. Both approaches analyze and design the impulse responses of the analysis filter bank directly. The synthesis filter bank is then obtained by simply changing the signs of odd-order coefficients in the analysis filter bank. The approach deals with unequal-le... View full abstract»

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  • On the efficiency of `A new efficient algorithm to compute the two-dimensional discrete Fourier transform'

    Publication Year: 1992, Page(s):469 - 470
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The commenter suggests that the efficiency claims made by I. Gertner in the above-titled paper (IEEE Trans. Acoust., Speech, Signal Processing, vol.36, no.7, p.1036-50, July 1988), based on a Radon transform for reducing the number of 1-D discrete Fourier transform (DFTs) to compute a 2-D DFT, are offset by a costly increase in the number of additions required to perform the Radon transform. Gertn... View full abstract»

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  • Solution to the problem of instability in banded Toeplitz solvers

    Publication Year: 1992, Page(s):464 - 466
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The author presents a numerically stable approach to solving banded Toeplitz systems of n linear equations. The algorithm is fast in that it requires only O(nq) operations, where q is the bandwidth of the matrix. An earlier version of the banded Toeplitz algorithm presented in the literature suffers from numerical instability. The author solves the instability p... View full abstract»

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  • Zero-crossing based spectral analysis and SVD spectral analysis for formant frequency estimation in noise

    Publication Year: 1992, Page(s):282 - 293
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1028 KB)

    The authors discuss a method for spectral analysis of noise corrupted signals using statistical properties of the zero-crossing intervals. It is shown that an initial stage of filter-bank analysis is effective for achieving noise robustness. The technique is compared with currently popular spectral analysis techniques based on singular value decomposition and is found to provide generally better r... View full abstract»

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  • Localization by narrow-band autoregressive sources by passive sensor arrays

    Publication Year: 1992, Page(s):484 - 487
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The authors present a method for estimating the location of narrowband autoregressive (AR) sources with unknown spectral characteristics. Unique localization of multiple sources by antenna arrays requires that the number of sensors be greater than the number of sources. When additional information is given this is no longer true. The authors assume that the signals structure is of the AR type. The... View full abstract»

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  • Complex digital oscillators and FSK modulators

    Publication Year: 1992, Page(s):333 - 342
    Cited by:  Papers (26)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The authors present complex-valued free running oscillators derived from digital filter structures. Four alternative approaches of complex direct-form and coupled-form oscillator structures are discussed leading to a multiple-output direct-form oscillator as the best solution from the viewpoint of computational efficiency. Two inherent advantages of direct-form structures can be avoided by appropr... View full abstract»

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  • Variable-bit-rate speech transmission using punctured convolutional codes

    Publication Year: 1992, Page(s):443 - 446
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Rate (n-1)/n punctured convolutional codes are very effective in conjunction with embedded differential pulse code modulation (EDPCM) in variable-bit-rate speech transmission. The authors investigate the performance of this variable-bit-rate EDPCM system in terms of probability of bit error and audio signal-to-noise ratio (SNR) versus channel SNR in an additive white Gaussian noi... View full abstract»

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  • A resolution comparison of several time-frequency representations

    Publication Year: 1992, Page(s):413 - 420
    Cited by:  Papers (54)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    Two signal components are considered resolved in a time-frequency representation when two distinct peaks can be observed. The time-frequency resolution limit of two Gaussian components, alike except for their time and frequency centers, is determined for the Wigner distribution, the pseudo-Wigner distribution, the smoother Wigner distribution, the squared magnitude of the short-time Fourier transf... View full abstract»

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  • Design of linear-phase IIR filters via impulse-response gramians

    Publication Year: 1992, Page(s):389 - 394
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A new method for the design of a linear-phase infinite-impulse-response (IIR) filter is presented. It involves designing a finite-impulse-response (FIR) filter satisfying the given frequency response specifications and subsequently obtaining a significantly lower order IIR filter using model reduction based on impulse-response gramians. The general outline of the method and a brief overview of the... View full abstract»

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  • Bilinear signal synthesis

    Publication Year: 1992, Page(s):352 - 363
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    The authors discuss the signal synthesis problem in the general framework of bilinear signal representations (BSRs), thereby obtaining a unified treatment which encompasses, e.g., the Wigner distribution and ambiguity function as special cases. The inclusion of a signal space constraint serves to impart flexibility to the signal synthesis process and to relax mathematical requirements. The charact... View full abstract»

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Aims & Scope

IEEE Transactions on Signal Processing covers novel theory, algorithms, performance analyses and applications of techniques for the processing, understanding, learning, retrieval, mining, and extraction of information from signals

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Sergios Theodoridis
University of Athens