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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 12 • Date Dec. 1990

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Displaying Results 1 - 19 of 19
  • On the total least squares linear prediction method for frequency estimation

    Publication Year: 1990, Page(s):2186 - 2189
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    The total least squares (TLS) linear prediction (LP) method recently presented by Rahman and Yu (1987) and the equivalent improved Pisarenko's (IP) method by Kumaresan (1986) are reviewed and generalized by the whitening approach. The resulting whitened-TLS-LP method yields higher estimation accuracy than the TLS-LP. This simulation was carried out in double precision FORTRAN-77 on VAX-8810. The I... View full abstract»

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  • A high resolution data-adaptive time-frequency representation

    Publication Year: 1990, Page(s):2127 - 2135
    Cited by:  Papers (86)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A data-adaptive time-frequency representation is developed that overcomes some limitations of the short-time Fourier transform, while avoiding the cross-terms that make the Wigner distribution and other bilinear representations difficult to interpret. The adaptive time-frequency representations uses Gaussian basis functions but varies their time width and chirp rate with time and frequency to achi... View full abstract»

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  • Generalized signal-to-noise ratio and its estimation

    Publication Year: 1990, Page(s):2136 - 2139
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A generalized realized signal-to-noise ratio (generalized RSNR) is defined for the situation where there are r, p-dimensional, real, or complex valued signals and a transmitted message is to be classified as either one of them or as pure white noise. Certain estimators of generalized RSNR are suggested under various loss functions. The closest estimator in the sense of Pitman is ... View full abstract»

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  • Roundoff noise in signal estimation and minimization of total real estimator output noise

    Publication Year: 1990, Page(s):2075 - 2087
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    Statistical analysis of error due to roundoffs in the arithmetic in signal estimation is given. The convenience of modeling this error by an equivalent roundoff noise source is shown. Matrix relations for computing the roundoff noise in nonrecursive and recursive estimators implemented with fixed point and floating point arithmetic are derived. The derived relations are verified by a statistical s... View full abstract»

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  • A data flow technique for the efficient design of a class of parallel non-data flow signal processors

    Publication Year: 1990, Page(s):2162 - 2173
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1028 KB)

    A system called net optimization and resource allocation (NORA) is introduced for the evaluation and programming of parallel signal processors, based on a data flow representation of the signal processing application. The main feature of this approach is that the scheduling and resource allocation can be done at compile time. It is made possible by the fact that most signal processing algorithms h... View full abstract»

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  • FIR-median hybrid filters with excellent transient response in noisy conditions

    Publication Year: 1990, Page(s):2108 - 2117
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    Two classes of FIR-median hybrid (FMH) filters are introduced, which are called in-place growing FIR-median hybrid (IPG-FMH) and recursive in-place growing FIR-median hybrid (RIPG-FMH) filters. This new extended family of filters exhibits a very small bias error in the vicinity of an edge, an yet provides good noise attenuation. It is shown that the IPG-FMH filters can be expressed as weighted FMH... View full abstract»

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  • Parameter estimation of chirp signals

    Publication Year: 1990, Page(s):2118 - 2126
    Cited by:  Papers (161)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    The problem of the parameter estimation of chirp signals is addressed. Several closely related estimators are proposed whose main characteristics are simplicity, accuracy, and ease of online or offline implementation. For moderately high signal-to-noise ratios they are unbiased and attain the Cramer-Rao bound. Monte Carlo simulations verify the expected performance of the estimators. It should be ... View full abstract»

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  • MUSIC, maximum likelihood, and Cramer-Rao bound: further results and comparisons

    Publication Year: 1990, Page(s):2140 - 2150
    Cited by:  Papers (129)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    The problem of determining the direction-of-arrival of narrowband plane waves using sensor arrays and the related problem of estimating the parameters of superimposed signals from noisy measurements are studied. A number of results have been recently presented by the authors on the statistical performance of the multiple signal characterization (MUSIC) and the maximum likelihood (ML) estimators fo... View full abstract»

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  • Task allocation and scheduling models for multiprocessor digital signal processing

    Publication Year: 1990, Page(s):2151 - 2161
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    Task allocation and scheduling models for distributed digital signal processing are presented. The notions of block-type and stream-type tasks in signal processing application are introduced, and models for sequential and parallel I/O are presented. By extending the traditional models, more accurate schedules can be obtained. Those models can be further enhanced by allowing additional restrictions... View full abstract»

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  • Elimination of exponential interference form finite-length discrete signals

    Publication Year: 1990, Page(s):2189 - 2191
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    A method for removing exponential interference from discrete, finite-length signals is presented. The removal of the sine-wave interference is comparable to a sharp notch filter, but without transient effects. In addition, it is found that matrices, when multiplied with a vector of samples of any given signal, completely eliminate from it an exponential interference that satisfies a given homogene... View full abstract»

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  • Tied mixture continuous parameter modeling for speech recognition

    Publication Year: 1990, Page(s):2033 - 2045
    Cited by:  Papers (65)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    The acoustic-modeling problem in automatic speech recognition is examined with the goal of unifying discrete and continuous parameter approaches. To model a sequence of information-bearing acoustic feature vectors which has been extracted from the speech waveform via some appropriate front-end signal processing, a speech recognizer basically faces two alternatives: (1) assign a multivariate probab... View full abstract»

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  • Assessing the Hartley transform

    Publication Year: 1990, Page(s):2174 - 2176
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The fast algorithm for the (real) Hartly transform is discussed in relation to the established fast algorithm for the (complex) Fourier transform. The two transforms are compared by timing comparably written programs on a given machine, and the discipline of timing is discussed as an adjunct to complexity analysis. With real data, one Hartley transform program can economically replace such package... View full abstract»

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  • Localization in the presence of coherent interference

    Publication Year: 1990, Page(s):2025 - 2032
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Analytical expressions for the Cramer-Rao bounds on the bearing and range of a Gaussian signal source observed by two-dimensional array in the presence of strong Gaussian interference are obtained. It is shown that: (1) all relevant features of array geometry are summarized by a function closely related to the conventional beam pattern; (2) the minimum signal-interference separation at which beari... View full abstract»

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  • Minimal structures for the implementation of digital rational lossless systems

    Publication Year: 1990, Page(s):2058 - 2074
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    Digital lossless transfer matrices and vectors (power-complementary vectors) are discussed for applications in digital filter bank systems, both single rate and multirate. Two structures for the implementation of rational lossless systems are presented. The first structure represents a characterization of single-input, multioutput lossless systems in terms of complex planar rotations, whereas the ... View full abstract»

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  • Nonrecursive and recursive stack filters and their filtering behavior

    Publication Year: 1990, Page(s):2099 - 2107
    Cited by:  Papers (19)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    It is shown that stack filters that are based on symmetric threshold functions and preserve median-filter roots make all inputs converge to roots or to cycles of period two. This is an important result, since these filters have useful roots (the median-filter roots), and they are time symmetric, i.e. time reversal of an input sequence of such a filter is equivalent to time reversal of the output s... View full abstract»

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  • Analysis of the momentum LMS algorithm

    Publication Year: 1990, Page(s):2088 - 2098
    Cited by:  Papers (27)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    Several modifications of the well-known LMS algorithm have been proposed for improved operation. This work analyzes one such algorithm that corresponds to the standard LMS algorithm with an additional update term, parameterized by the scalar factor α where |α|<1. The analysis of convergence yields some novel behavior insofar that it leads to complex eigenvalues of the transition mat... View full abstract»

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  • Bispectral analysis of two-dimensional random processes

    Publication Year: 1990, Page(s):2181 - 2186
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    The extension of bispectral analysis from one-dimensional random processes (e.g. time series) to two-dimensional random processes is presented. Use of the symmetry properties of the bispectrum reduces the number of computations considerably. Numerical simulations demonstrate the ability of two-dimensional bispectral estimation to detect quadratic phase coupling between waves traveling in different... View full abstract»

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  • Tracking analysis of the sign algorithm in nonstationary environments

    Publication Year: 1990, Page(s):2046 - 2057
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    A tracking analysis of the adaptive filters equipped with the sign algorithm and operating in nonstationary environments is presented. Under the assumption that the nonstationary can be modeled using a random disturbance, it is shown that the long-term time average of the mean-absolute error is bounded, and that there exists an optimal choice of the convergence constant μ which minimizes this q... View full abstract»

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  • Stationary points of the constant modulus algorithm for real Gaussian signals

    Publication Year: 1990, Page(s):2176 - 2181
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    An analysis of the stationary points for four versions of the constant modulus algorithm (CMA) when the received signal is a zero-mean, real Gaussian process is presented. With this type of signal, it is well known that CMA generally cannot equalize a communication channel; the analysis of the CMA performance function demonstrates how this occurs. It is shown that in each case the stationary point... View full abstract»

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Aims & Scope

This Transactions ceased production in 1990. The current retitled publication is IEEE Transactions on Signal Processing.

Full Aims & Scope