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IEEE Transactions on Acoustics, Speech, and Signal Processing

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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  • Spectral filtering using the fast Walsh transform

    Publication Year: 1985, Page(s):1246 - 1252
    Cited by:  Papers (11)
    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)

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  • [Back cover]

    Publication Year: 1985, Page(s): c4
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    Freely Available from IEEE
  • Array signal processing

    Publication Year: 1985, Page(s): 1346
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

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  • A transformation method for the reconstruction of functions from nonuniformly spaced samples

    Publication Year: 1985, Page(s):1151 - 1165
    Cited by:  Papers (137)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1640 KB)

    The reconstruction of functions from their samples at nonuniformly distributed locations is an important task for many applications. This paper presents a sampling theory which extends the uniform sampling theory of Whittaker et al. [11] to include nonuniform sample distributions. This extension is similar to the analysis of Papoulis [15], who considered reconstructions of functions that had been ... View full abstract»

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  • On a conjecture of J. L. C. Sanz and T. S. Huang

    Publication Year: 1985, Page(s):1338 - 1341
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    In [1] J. L. C. Sanz and T. S. Huang conjectured that the DFT implementation of the Papoulis-Gerchberg algorithm for the extrapolation of band-limited signals does approach the continuous extrapolation. In this respect we prove a result on the approximation of band-limited functions by trigonometric polynomials, simultaneously increasing its degree and the period-length. This will imply that the a... View full abstract»

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  • Computing the ambiguity surface

    Publication Year: 1985, Page(s):1239 - 1245
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The computation of the discrete ambiguity function is considered. Two straightforward methods are developed depending upon whether we write the discrete ambiguity as a filter or as a discrete Fourier transform. A modification of the transform method produces an approximation to the discrete ambiguity function, but has increased computational efficiency. This method is based on a recent work [1]. I... View full abstract»

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  • Toeplitz eigensystem solver

    Publication Year: 1985, Page(s):1264 - 1271
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    In this paper, a novel algorithm for computing the minimum eigenvalue and associated eigenvector is presented. This algorithm is a derivative of the inverse iteration method which requires a linear system to be solved in each iteration. Taking advantage of the Toeplitz structure, a pipelined Toeplitz system solver can be applied to solve the Toeplitz system in O(N) time units with O(N) processors.... 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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  • Implementing FIR filters with distributed arithmetic

    Publication Year: 1985, Page(s):1318 - 1321
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    A new approach for implementing FIR filters with distributed arithmetic is presented. This approach uses a RAM to store the input sequences, utilizes a partitioned ROM to store the combinational values of the filter coefficients, and provides the arrangement techniques for adders which are used for accumulating the partial product and the sum. The proposed approach results in a very low storage re... 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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  • On computing the discrete Hartley transform

    Publication Year: 1985, Page(s):1231 - 1238
    Cited by:  Papers (176)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    The discrete Hartley transform (DHT) is a real-valued transform closely related to the DFT of a real-valued sequence. Bracewell has recently demonstrated a radix-2 decimation-in-time fast Hartley transform (FHT) algorithm. In this paper a complete set of fast algorithms for computing the DHT is developed, including decimation-in-frequency, radix-4, split radix, prime factor, and Winograd transform... 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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  • 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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  • Adaptive filters: Structures, algorithms, and applications

    Publication Year: 1985, Page(s): 1345
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

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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 (24)  |  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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  • Efficient recursive in order least squares FIR filtering and prediction

    Publication Year: 1985, Page(s):1175 - 1187
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    This paper is concerned with the efficient determination of the optimum, in the least squares sense, FIR filter on the basis of data samples of the input and desired response signals, by procedures recursive in the filter order. This situation typically arises when no a priori statistics are available and the system order is not known. The general multiinput-multioutput (multichannel) case is cons... View full abstract»

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  • Modal dispersion effects on coherent signal processing parameters

    Publication Year: 1985, Page(s):1092 - 1094
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Acoustic signals propagated in deep ocean ducts are geometrically (or modally) dispersed. The effects of the dispersion on coherent signal processing is examined in this paper. Using a model, which for long range-deep ocean propagation has been shown to adequately predict dispersion measures, it is determined that the effects of dispersion on the bandwidth of the signal are small. However, in cohe... View full abstract»

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  • 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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  • Elliptic filter design for a class of generalized halfband filters

    Publication Year: 1985, Page(s):1146 - 1150
    Cited by:  Papers (27)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    In multirate processing, symmetric finite impulse response halfband filters constitute an important class of filters that are useful for sampling rate alteration by a factor of two. Generalizing the notion of halfband filters to include infinite impulse response filters, a class of generalized halfband filters is examined and its properties are studied. The filters are efficient and have low round... View full abstract»

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  • Fast minimum variance deconvolution

    Publication Year: 1985, Page(s):1324 - 1326
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    We propose a statistical estimation approach to the deconvolution problem which is optimal in the minimum variance sense when the a priori knowledge on the signal to be restored is strictly limited to its first two moments. By viewing the estimation problem as a degenerate case of a Kalman filter applied to a static system with time-varying measurements and by developing the corresponding Chandras... View full abstract»

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  • Bispectrum estimation: A parametric approach

    Publication Year: 1985, Page(s):1213 - 1230
    Cited by:  Papers (193)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1608 KB)

    Higher order spectra contain information about random processes that is not contained in the ordinary power spectrum such as the degree of nonlinearity and deviations from normality. Estimation of the bispectrum, which is a third-order spectrum, has been applied in various fields to obtain information regarding quadratic phase coupling among harmonic components and non-Gaussianness of processes. E... 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