IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 2 • Feb 1989

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Displaying Results 1 - 16 of 16
  • Improved addition for the logarithmic number system

    Publication Year: 1989, Page(s):301 - 303
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The logarithmic number system (LNS), which offers a wide dynamic range with an independently choosable signal-to-noise ratio, is discussed. To realize addition, voluminous lookup tables are needed. A method is proposed to reduce the storage requirements of these tables by means of Chebyshev approximation with unequally spaced partition points View full abstract»

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  • A new window and comparison to standard windows

    Publication Year: 1989, Page(s):298 - 301
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A new window, w(t)=0.62-0.48|t|+0.38 cos 2πt, |t|⩽1/2, is introduced. It is shown that the window is of a group with similar but different tradeoff properties with the Bartlett, the Hanning, and the Hamming windows. The proposed window is more effective than the Bartlett and the Hanning in the near sidelobes, and more effective than the Bartlett ... View full abstract»

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  • Velocity filtering of acoustic well logging waveforms

    Publication Year: 1989, Page(s):265 - 274
    Cited by:  Papers (6)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1012 KB)

    A velocity filter that is based on a particularly convenient and effective combination of an up/down filter and slanting (time-shift) operations is presented. The up/down filter is based on a cascade of spatial and temporal Hilbert transform filters. The Hilbert transform filters and the time-shift operators are finite-duration impulse response (FIR) filters designed according to the minimax crite... View full abstract»

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  • Maximum likelihood noise cancellation using the EM algorithm

    Publication Year: 1989, Page(s):204 - 216
    Cited by:  Papers (48)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    An approach to the two-microphone speech enhancement problem is discussed. Specifically, a maximum-likelihood (ML) problem is formulated for estimating the parameters needed for canceling the noise, and solved by the iterative EM (estimate-maximize) technique. The EM algorithm has been implemented for both a simplified and a more general scenario. The results improve upon those obtained with the c... View full abstract»

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  • Frequency difference of arrival accuracy

    Publication Year: 1989, Page(s):306 - 308
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The problem considered occurs in the geolocation of a fixed emitter using observations from two moving collectors. Estimates for the time difference and frequency difference of signal arrivals are used. Frequency difference of arrival (FDOA) is estimated through the use of a mixing product. Standard regression analysis procedures are then applied to estimate the slope of the unwrapped phase angle.... View full abstract»

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  • A dynamic programming algorithm for elastic registration of distorted pictures based on autoregressive model

    Publication Year: 1989, Page(s):288 - 297
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    It is shown how to register a picture and a map when the deformation of the picture is severe by totally unknown. The method makes use of the combination of autoregressive (AR) modeling of the deformation working at the pixel level and a dynamic programming (DP) frame working at a higher level. AR modeling and DP work jointly: DP provides several sequences of observations which are candidates for ... View full abstract»

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  • Quiver diagrams and signed adaptive filters

    Publication Year: 1989, Page(s):227 - 236
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    A graphical technique for exploring the behavior of deterministic discrete time adaptive algorithms excited by periodic inputs is examined. The constraint to periodic inputs is convenient; the underlying concepts used also apply to stationary inputs drawn from finite alphabets. The resulting graph is based on plotting single-period parameter trajectories in the parameter error space and is essenti... View full abstract»

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  • Analysis of an adaptive technique for modeling sparse systems

    Publication Year: 1989, Page(s):254 - 264
    Cited by:  Papers (50)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    An effective technique for modeling sparse systems has been developed, and the error surface of the system is analyzed with respect to estimation noise. The technique requires a type of adaptive filter which is called an adaptive delay filter. An implementation of the adaptive delay filter is discussed that includes adaptive gains in addition to variable delay taps. The filter is especially applic... View full abstract»

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  • An analysis of several partially adaptive beamformer designs

    Publication Year: 1989, Page(s):192 - 203
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    A general analysis of broadband interference cancellation in adaptive beamformers is provided. The results are then used to analyze beam, eigenstructure, and power-minimization approaches to the design of linearly constrained partially adaptive beamformers. It is shown that although beam-based designs are capable of good performance in narrowband environments, they are not appropriate for broadban... View full abstract»

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  • Efficient impulsive noise suppression via nonlinear recursive filtering

    Publication Year: 1989, Page(s):303 - 306
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A nonlinear recursive filter for the suppression of impulsive noises is proposed. The filter selects from each window the sample closest in value to the most recent output and is thus named the last output reference (LOR) filter. A relationship between the LOR and recursive median filters is derived, and some statistical properties are studied through computer simulation. The results indicate that... View full abstract»

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  • Theory of order statistic filters and their relationship to linear FIR filters

    Publication Year: 1989, Page(s):275 - 287
    Cited by:  Papers (53)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1160 KB)

    Necessary and/or sufficient conditions on both the filter coefficients and the signal process are derived in order that nonrecursive order statistic (OS) and linear filtering are equivalent operations. The results indicate that an understanding of OS filters hinges on a better understanding of the properties of signals containing logically monotonic components. The results extend a number of previ... View full abstract»

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  • Optimal deconvolution based on polynomial methods

    Publication Year: 1989, Page(s):217 - 226
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The problem of estimating the input to a known linear system is treated in a shift operator polynomial formulation. The mean-square estimation error is minimized. The input and a colored measurement noise are described by independent ARMA (autoregressive moving average) processes. The filter is calculated by performing a spectral factorization and solving a polynomial equation. The approach can be... View full abstract»

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  • Input and output index mappings for a prime-factor-decomposed computation of discrete cosine transform

    Publication Year: 1989, Page(s):237 - 244
    Cited by:  Papers (31)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A formal direct derivation of the prime-factor-decomposed computation algorithm is presented. The derivation is direct in the sense that it is based on the real cosine function without resort to the discrete Fourier transform expressions or the complex functions. Based on the equations obtained from the derivation, input and output index mappings are introduced in the form of tables. This tabulati... View full abstract»

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  • L1 and L minimization via a variant of Karmarkar's algorithm

    Publication Year: 1989, Page(s):245 - 253
    Cited by:  Papers (64)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    Simple iterative algorithms are presented for L1 and L∞ minimization (regression) based on a variant of Karmarkar's linear programming algorithm. Although these algorithms are based on entirely different theoretical principles to the popular IRLS (iteratively reweighted least squares) algorithm, they have almost identical matrix operations. Also prese... View full abstract»

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  • Detection of transient signals by the Gabor representation

    Publication Year: 1989, Page(s):169 - 180
    Cited by:  Papers (125)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    Gabor representation is used for the detection of transient signals with unknown arrival times. A one-sided exponential window function is used which seems to be most appropriate for transient modelling. Explicit expressions for the Gabor coefficients are given for this window function. When the given signal is random, so are the coefficients. The second-order moments of the Gabor coefficients are... View full abstract»

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  • A robust spectral estimation by modeling an estimated autocovariance with an ARMA model

    Publication Year: 1989, Page(s):181 - 191
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The development, analysis, simulation results, and comparison of techniques for estimating spectral peaks of stationary signals in environments with low signal-to-noise ratio are discussed. Unlike traditional parametric methods, the proposed method estimates parameters of a model which best approximates the estimated autocovariance lag rather than the received signal. This technique is studied and... 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