IEEE Transactions on Acoustics, Speech, and Signal Processing

Volume 33 Issue 1 • February 1985

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Displaying Results 1 - 25 of 52
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): 0
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  • Fast algorithms for lpdeconvolution

    Publication Year: 1985, Page(s):174 - 182
    Cited by:  Papers (66)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (921 KB)

    This paper discusses two algorithms forl_{p}, 1 leq p leq 2, deconvolution. One, iterative reweighted least squares (IRLS), is discussed with an eye toward improving its computational efficiency, while the other, residual steepest descent (RSD), is considered in an attempt to improve its convergence properties. In the first case, fast Fourier transforms are used to reduce the number of ... View full abstract»

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  • A fast algorithm for solving a Toeplitz system of equations

    Publication Year: 1985, Page(s):254 - 267
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1468 KB)

    A fast algorithm for the solution of a Toeplitz system of equations is presented. The algorithm requires orderN(log N)^{2}computations where N is the number of equations. For banded Toeplitz matrices the order of computations is reduced to onlyN log N + m(log m)^{2}where 2m is the maximum number of nonzero principal subdiagonals of the Toeplitz matrix. The algorithm is in ess... View full abstract»

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  • Sampling expansions for multiband signals

    Publication Year: 1985, Page(s):312 - 315
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (434 KB)

    The class BIof finite energy signals bandlimited to a set I is considered where I denotes a finite union of disjoint open intervals (bands) on the real frequency axis. If such a signal is sampled uniformly (constant intersample spacing T), it is shown that the following five propositions are equivalent. 1) Any signal in BIis uniquely determined from its uniform samples taken ... View full abstract»

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  • VLSI Silicon compilation and the art of automatic microchip design [Book Reviews]

    Publication Year: 1985, Page(s):336 - 337
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  • Adaptive filtering prediction and control [Book Reviews]

    Publication Year: 1985, Page(s):337 - 338
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  • LC filter design, test, and manufacturing

    Publication Year: 1985, Page(s): 337
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (161 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1985, Page(s): c4
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  • The least squares estimation of time delay between two signals with unknown relative phase shift

    Publication Year: 1985, Page(s):308 - 309
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    This correspondence addresses the problem of time delay estimation between two signals with an unknown constant relative phase shift. The method of time delay estimation for the pure delay case of Chan et al. [1] is applied here to derive the least squares estimator (LSE). An explicit expression for the LSE of the delay is obtained which is computationally less complex than the maximum likelihood ... View full abstract»

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  • Short-time Fourier transform using a bank of low-pass filters

    Publication Year: 1985, Page(s):182 - 185
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The purpose of this paper is to present some experimental results estimating instantaneous frequencies of FM (frequency modulation) signals using the short-time Fourier transform (STFT) method. The relevant STFT coefficients were computed using a bank of simple one-pole low-pass filters which estimates the cross correlation of a given signal and complex sinusoids. Also, it is shown that computing ... View full abstract»

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  • Estimates for the stability of low-pass filters

    Publication Year: 1985, Page(s):98 - 105
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    A measure of stability is defined for digital filters. It is shown that the stability of low-pass filters goes to zero as the filter characteristics approach that of an ideal low-pass filter. More precisely, estimates for the rate of convergence are given. It is shown that, except for constants, the stability of a low-pass filter is no greater than the square root of the reciprocal of the logarith... View full abstract»

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  • Variance and bias of the normalized relay correlation estimator

    Publication Year: 1985, Page(s):334 - 336
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    In a recent paper, Gabriel states that no simple or enlightening expression exists for the variance and bias of the normalized relay correlation estimator for independent pairs of Gaussian samples. In this note, approximate expressions for this variance and bias are derived which are both simple and agree with the empirical variances measured by Gabriel. View full abstract»

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  • The application of the frequency domain LMS adaptive filter to split array bearing estimation with a sinusoidal signal

    Publication Year: 1985, Page(s):61 - 69
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    This paper considers the use of the frequency domain LMS adaptive filter in a split array sonar to estimate the bearing of a plane wave acoustic source radiating a sinusoidal signal. For such a signal, the bearing can be determined from the relative signal phase between split array outputs at the signal frequency. In this paper, the split array outputs are fast Fourier transformed and used as the ... View full abstract»

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  • Circular harmonic analysis of PSF's corresponding to separable polar-coordinate frequency responses with emphasis on fan filtering

    Publication Year: 1985, Page(s):300 - 307
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    A method based on radius-dependent angular Fourier coefficients (circular harmonics) is used to analyze the point spread function (PSF) of any 2-D filter whose frequency response is separable in the polar-coordinate variables. The approach relies on the ability to express the PSF as the angular cyclic convolution of two functions related to the angular and radial characteristics of the frequency r... View full abstract»

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  • Fitting autoregressive models to EEG time series: An empirical comparison of estimates of the order

    Publication Year: 1985, Page(s):143 - 150
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    A parametrization of the spectral structure of time series data is of great interest in many fields of science such as eleetroencephalography (EEG). Autoregressive processes offer such a representation. The problem is to find a parsimonious representation which fits the data well. Three criteria for determining the order of autoregressive models are, therefore, compared. A simulation is done for s... View full abstract»

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  • Optimal solution of a training problem in speech recognition

    Publication Year: 1985, Page(s):326 - 329
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    We take the view that the payoff correpsonding to different ways of training a speech recognizer is the probability that the recognizer will correctly recognize a randomly chosen word. In "A Decision Theoretic Formulation of a Training Problem in Speech Recognition" we posed the problem of choosing a speech recognizer as an optimization problem with the expected value of the above payoff as the ob... View full abstract»

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  • A new technique for the design of two-dimensional FIR and IIR filters

    Publication Year: 1985, Page(s):268 - 280
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1208 KB)

    The design problem of two-dimensional digital filters is the subject of this paper. The problem is formulated for both FIR and IIR filters in such a way that the performance index is a convex function of the optimization vector. The design technique is based on Newton's method. Each iteration consists of N easily computed steps, where N is the number of parameters to be optimized. The coefficients... View full abstract»

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  • Optimum detection performance of passive coherence estimators

    Publication Year: 1985, Page(s):240 - 248
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    Two-dimensional coherence processing is commonly used for passive detection in acoustic sensor systems. Modern coherence processors well suited for this purpose include the magnitude-squared coherence (MSC) estimator and the normalized correlation envelope (NCE) estimator. These are biased estimators whose performance characteristics are not well understood and are exceptionally difficult to analy... View full abstract»

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  • A new generalized cross correlator

    Publication Year: 1985, Page(s):38 - 45
    Cited by:  Papers (28)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A new generalized cross correlator (GCC) for the passive time delay estimation problem is presented. The interpretation of this GCC is that of estimating the cross-correlation function by cross correlating the least mean-square estimates of the signal component in each of the observed waveforms. The implementation is simply a GCC with the weighting filter equal to the magnitude coherency squared. ... View full abstract»

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  • Time-delay estimation performance in a scattering medium

    Publication Year: 1985, Page(s):50 - 60
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The effects of a scattering medium on the performance of time-delay estimation are considered. The medium is assumed to exhibit angular scattering, causing angular (as well as delay) dispersion and hence loss of signal coherence across the array aperture. Both the variance (via the Cramer-Rao bound) and the bias introduced in the time-delay estimates are studied. The results have been converted to... View full abstract»

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  • Two-dimensional linear prediction models--part I: Spectral factorization and realization

    Publication Year: 1985, Page(s):280 - 299
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1752 KB)

    In this paper we present several results for three different canonical forms of linear prediction on a plane. These filters have causal, semicausal, and noncausal prediction geometries. Starting from their properties we consider the problem of realization of these filters from a given power spectral density function (SDF). Since it is not possible in general to obtain rational spectral factors of ... View full abstract»

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  • A class of low-noise computationally efficient recursive digital filters with applications to sampling rate alterations

    Publication Year: 1985, Page(s):90 - 97
    Cited by:  Papers (73)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    A new structure for multiband recursive digital filters is proposed. For meeting low-pass filter specifications, it uses fewer multiplications than conventional elliptic filter realizations. An approximation to the minimax solution is obtained numerically by minimizing the LP error norm. The analytic optimum for odd order low-pass filters of this new class turns out to be the elliptic filter itsel... View full abstract»

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  • Analysis of the short-time unbiased spectrum estimation algorithm.

    Publication Year: 1985, Page(s):136 - 142
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The short-time unbiased spectrum estimation (STUSE) algorithm is analyzed and expressions for the mean and variance of the spectrum estimates are derived. The STUSE algorithm deliberately adds biased spectrum estimates in order to yield unbiased estimates and at the same time have excellent spectral leakage suppression capabilities. Computer simulations are presented, verifying the theoretical res... View full abstract»

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  • Positive time-frequency distribution functions

    Publication Year: 1985, Page(s):31 - 38
    Cited by:  Papers (100)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    We demonstrate the existence of positive joint distributions of time and frequency for arbitrary signals. A method is given to readily generate an infinite number of them for any signal. General properties of these distribution functions are derived and specific examples for some common signals are presented. View full abstract»

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  • A method for cancelling interference from a constant envelope signal

    Publication Year: 1985, Page(s):316 - 319
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A method for adaptively cancelling interference from a constant envelope target signal is presented. The method is useful, even when some of the interfering signals are also constant envelope. The adaptive algorithm distinguishes between target signal and interference on the basis of signal amplitude and envelope shape. The amplitude of the target signal must be approximately known or measurable. 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