IEEE Transactions on Acoustics, Speech, and Signal Processing

Volume 33 Issue 5 • October 1985

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Displaying Results 1 - 25 of 46
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): 0
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    Freely Available from IEEE
  • Spectral filtering using the fast Walsh transform

    Publication Year: 1985, Page(s):1246 - 1252
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    This paper describes a method of doing spectral filtering using the fast Walsh transform (FWT) rather than the fast Fourier transform (FFT). Rather than using the Walsh transform to find Fourier coefficients which can then be filtered by ordinary means, as was done in [2], we find a new filter function, expressed as a matrix, that does the same filtering operation in the Walsh domain as the filter... View full abstract»

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  • Finding the poles of the lattice filter

    Publication Year: 1985, Page(s):1328 - 1331
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (475 KB)

    The lattice filter is often used in spectral analysis problems. Once the reflection coefficients{c_{k}}are found, the task remains of extracting spectral information from them. Frequently this is done by DFT methods. An appealing alternative is to find the poles (modes) of the lattice directly. In this paper, we present an algorithm for computing the poles of the lattice directly from t... View full abstract»

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  • Comments on "Design of inherently stable two-dimensional recursive filter from one-dimensional filters"

    Publication Year: 1985, Page(s):1337 - 1338
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (217 KB)

    In a recent paper, a method for designing a restricted class of stable two-dimensional recursive filters from one-dimensional filters was given. The class of filters considered are those with a second-order (in each variable) transfer function with some additional constraints. It was claimed that the method given can lead to all possible stable filters of the type considered there. The purpose of ... View full abstract»

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  • Multidimensional digital signal processing

    Publication Year: 1985, Page(s):1345 - 1346
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1985, Page(s): c4
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    Freely Available from IEEE
  • Design of 2-D recursive digital filters with constant group delay characteristics using separable denominator transfer function and a new stability test

    Publication Year: 1985, Page(s):1316 - 1318
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    In this paper, based on a new stability test, two 1-D polynomials in z1and z2having all their zeros inside the unit circles in z1and z2planes are generated and assigned to the denominator of a separable denominator 2-D transfer function while the numerator is left to a 2-D nonseparable polynomial in z1and z2. Now any suitable nonlin... View full abstract»

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  • Stacking of noisy seismic traces via maximum entropy with a correlation coefficient constraint

    Publication Year: 1985, Page(s):1331 - 1333
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A method is developed for stacking a gather of seismic traces in cases where there is a wide variation in the noise power of the traces. Each trace in the stack is weighted by a probability. The entropy of the probability distribution is maximized subject to the constraint that the expected value of the correlation coefficient of each trace with respect to the rest of the gather is fixed. A simple... View full abstract»

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  • Direction determination of wideband signals

    Publication Year: 1985, Page(s):1114 - 1122
    Cited by:  Papers (33)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    A computationally efficient sensor array processing method has been developed for estimating the bearings of multiple planewave sources with unknown frequency characteristics within a wideband. The method uses the zero-delay covariances of the complex analytic representations of the sensor signals of a planar array to estimate the wavenumber spectrum. This spectrum determines source bearings over ... View full abstract»

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  • A single modulus complex ALU for signal processing

    Publication Year: 1985, Page(s):1302 - 1315
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1560 KB)

    Fast complex arithmetic is essential to a wide class of real-time digital transform and filter operations. Traditional methods require a multiplicity of real multiplies and adds be performed on each complex product call. Recently, a new modular (residue) mathematical system has been proposed which more than halves this count. The system developed in this paper overcomes many of the classical weakn... View full abstract»

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  • Dynamic range and error dissipation of adaptive quantizers

    Publication Year: 1985, Page(s):1073 - 1075
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    An analysis of backward estimating adaptive quantizers is presented. The algorithms studied are linear in logarithmic step size, which is the case for many quantizers presented in the literature. The dynamic range in terms of signal-to-distortion ratio and the effect of digital errors on the decoding process are investigated. It is shown that an unlimited dynamic range is possible only at the expe... View full abstract»

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  • A QNAR-AGC estimator with reduced arithmetic complexity

    Publication Year: 1985, Page(s):1111 - 1113
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    This paper presents a simple method for drastic reduction of the computational requirement for realization of the quasi-noise alone reference (QNAR) estimation of noise power [1]. The new estimator does not bring forth performance degradation, as shown by extensive computer simulations, and is amenable to hardware implementation for certain real-time signal processing problems. View full abstract»

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  • Sectioned implementation of two-dimensional symmetric half-plane recursive filters

    Publication Year: 1985, Page(s):1272 - 1279
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    This paper concerns sectioning approaches for the implementation of two-dimensional recursive filters with symmetric half-plane support. Two new algorithms are presented and compared to the direct implementation as regards computational requirements. Procedures for choosing optimal sectioning parameters for both infinite and finite size rows are provided. This method has been implemented on a scie... View full abstract»

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  • On an adaptive antenna array under directional constraint

    Publication Year: 1985, Page(s):1326 - 1328
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    It is shown that for narrowband applications, the number of linear constraints needed for an adaptive array to achieve a fixed look direction response can be reduced from two to one. The result is useful since it can be exploited to reduce the computational complexity required to determine the optimal weight vector. View full abstract»

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  • The two-dimensional differential cepstrum

    Publication Year: 1985, Page(s):1335 - 1337
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The two-dimensional (2-D) differential cepstrum, which has no ambiguity in its phase relationship, is introduced as a new basis for homomorphic deconvolution. Its properties and implications are discussed. View full abstract»

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  • Lower bounds on worst case probability of large error for two channel time delay estimation

    Publication Year: 1985, Page(s):1102 - 1110
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    A lower bound on the worst case probability of large error for two channel time delay estimation using random signals is developed. The bound is based on the minimum probability of error M-ary hypothesis test using a maximum likelihood estimator (MLE). The bound can only be evaluated approximately; however, it can be determined arbitrarily well via simulation if the MLE can be instrumented. The bo... View full abstract»

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  • Edge-sensitive image restoration using order-constrained least squares methods

    Publication Year: 1985, Page(s):1253 - 1263
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1944 KB)

    In this paper we consider a novel technique for the restoration of noise corrupted images, using order-constrained least squares methods. The restoration process uses a moving cross-shaped filter window, within which two operations are combined. The first operation consists of simple hypothesis tests for the presence of an edge of some minimal height δ, crossing the center of the window. The ... View full abstract»

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  • Sprachverarbeitung und sprachuebertragung (speech processing and speech transmission)

    Publication Year: 1985, Page(s):1346 - 1347
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    First Page of the Article
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  • Fast MLM power spectrum estimation from uniformly spaced correlations

    Publication Year: 1985, Page(s):1333 - 1335
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    We derive a fast algorithm for calculating the Capon maximum likelihood method (MLM) power spectrum estimate when given uniformly spaced samples of the correlation function. This algorithm computes a weighted correlation of the predictor coefficients found by running Levinson recursion. The Fourier transform of the result gives the MLM spectrum. This approach also suggests an interesting new compa... View full abstract»

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  • Multiple source location--A matrix decomposition approach

    Publication Year: 1985, Page(s):1086 - 1091
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    In this paper we present a new method, without using the eigenstructure of the sensor covariance matrix, for estimating the number of sources d and the direction-of-arrival of sources based on the matrix decomposition. This method uniformly handles coherent and noncoherent sources alike. In our procedure a number p is calculated and used for determination of the maximum number of distinguishable s... View full abstract»

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  • Output distributions of two-dimensional median filters

    Publication Year: 1985, Page(s):1280 - 1295
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    The output distribution for the separable two-dimensional median filter and the square window two-dimensional median filter are derived for several cases, including first-order and multivariate output distributions with white noise, signals plus white noise, and general multivariate input images. These are then used to compute some specific statistics in several illustrative examples. View full abstract»

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  • Asymptotic properties of high-order Yule-Walker estimates of the AR parameters of an ARMA time series

    Publication Year: 1985, Page(s):1095 - 1101
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The high-order Yule-Walker equations are used to estimate the autoregressive parameters of an autoregressive moving-average time series. The asymptotic statistical properties of these estimates are derived. It is shown that they are asymptotically unbiased and normal, the covariance matrix of the limit distribution is derived. The special case of estimating the autoregressive parameters of a noise... View full abstract»

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  • Second-order equivalence of rectangular and exponential windows in least-squares estimation of Gaussian autoregressive processes

    Publication Year: 1985, Page(s):1209 - 1212
    Cited by:  Papers (25)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Exact least-squares algorithms for autoregressive signals can be made to track time-varying parameters by using sliding windows on the data. Two common choices for such windows are the exponential one and the rectangular one. In this paper, it is shown that for Gaussian autoregressive processes, the two types of windows yield approximately the same mean-square error if the windows' parameters are ... View full abstract»

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  • Worst-case signal spectra for broadband detection

    Publication Year: 1985, Page(s):1296 - 1301
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    As a class, broadband detection problems are difficult to analyze because, even for a fixed noise spectrum and fixed broadband signal-to-noise ratio (SNR), a continuum of different signal spectrum choices exists, each resulting in a different receiver operating characteristic (ROC) point. This paper derives the asymptotically worst-case signal spectrum corresponding to a given noise spectrum and S... View full abstract»

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  • A recursive procedure for ARMA modeling

    Publication Year: 1985, Page(s):1188 - 1196
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    This paper presents a two-part fast recursive algorithm for ARMA modeling. The algorithm first obtains estimates of the p autoregressive coefficients from a set of p extended Yule-Walker equations. An exact recursive lattice algorithm for this estimator is then derived. The q + 1 numerator spectrum coefficients are then obtained by using one of the output data sequences of this lattice algorithm. ... 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